Tuning vacuum advance distributor

the limits of the mechanical advance (mechanical advance consists of the. Permits infinite adjustment. The timed spark fitting in the choke side of the primary metering block provides vacuum for the operation of the distributor vacuum advance. Every engine that is put into different service, from when it was new, needs the distributor set up under a load, creating horsepower. Manifold vacuum is very high when under light load, but as you accelerate it becomes weaker. So to compliment the performance curve of our distributor, we must now replace the stock vacuum advance unit with a unit that will give us a total vacuum advance of not more than 16 degrees. Plus, there's a vacuum advance canister to help economy at moderate cruise speeds. Instantly increase your horsepower. I just ditched my msd marine mechanical advance for vacuum. If you have a strobe light, try 20d BTDC at slow idle. With the distributor modified to eliminate the vacuum advance schedule, but the total timing remaining the same as with the unmodified distributor we were . Check for smooth movement of the vacuum advance plate, preferably by sucking on the . 1 Jan 2003 . Please check your distributor specification. Adjust the hot base initial timing to FSM spec. Vacuum advance works by rotating the base plate to change the position of the magnetic pickup relative to the “stator” on the distributor shaft. Advance Starts . reads the vacuum at the base plate of the carburetor. ” The excitement right now is in regards to their new programable distributors, the 123Tune series, where both the mechanical and vacuum advance curves can be customized and the changes installed even while you are driving. Another great benefit of the MSD Ready-to-Run distributor is the mechanical advance. What is going on here? The answer lies in your distributor. and street performance ignitions do not have vacuum advance and the stock type distributors that are sent to a shop to be recurved should have the vacuum advance removed and locked out. Ported vacuum: 16° initial advance + 20° centrifugal advance = 36° total. 00. For the street, you want the MSD #8477 Pro-Billet distributor with a vacuum advance. Mechanical Advance Curve Kit with extra springs allow you to recurve your distributor for full advance at optimum RPM; precision stamped weights, welded pins and center plates with smooth edges eliminate . The fuel pump pressure should be no more than 6. #9. you will find when you get the advance dialed in,that it will be fully advanced at around 15" vacuum,a bit high,but with a mild cam,and properly set up carb,you'll be running strong vacuum at cruising speed. Forgot to mention that one needs to remove the Vacuum line going to the vacuum advance on the distributor or the timing will not set correctly. This is the wrong way to go about it. If hooked to full time vacuum you cannot set the base timing properly. Method 1) with the stock carb or FI system read vacuum at the stock port with your mini-mightymax vacuum pump and tester. There is no difference in plug life and no noticeable difference in gas mileage. There are two methods we use to check the distributors advance curve, the best method involves the use of a distributor test stand to check and set both the mechanical and vacuum advance curves, and the second choice is the use of a dial-back advance timing light to check the advance curves. To check the unit, follow the hose or hoses to the vacuum pick-up on the carb or manifold and remove it at this point. If original distributor is a vacuum advance unit, note the direction that the vacuum chamber is pointing and remove the vacuum line. Standard ignition curve including vacuum advance . Turn distributor clockwise to advance, or anti-clockwise to retard Verify the timing mark, then tighten the hold-down bolt General process to find optimal timing after the timing has been set to "spec". Low rpm performance will be good, and high rpm power will be good, and the thing won't ping. When timed, return the idle RPM to specks and adjust the air adjust on the carburetor. New motor put a new distributor in and not that chinese crap from your local auto parts store. 1973 TR6 Damson Plum / Biscuit interior, HVDA 5-speed, Good Parts Hubs. The Non Ported vacuum on the carburetor feeds vacuum directly from below the throttle plate, or intake manifold vacuum. A vacuum advance is on the side of the distributor, usually a cone shaped metal unit with a vacuum hose connected to it. Bumped up the initial to make up for the 7* mech loss and what a . This is the purpose of the vacuum advance. 2L distributor also features a vacuum canister. 17 This product is not currently available. My other question: are most of the people running a CV carb setup not even . also. , extractor exhaust, and 34PICT3 carb. The mechanical advance along with the initial advance (base timing set at idle) is what gives you total timing. It does not have the "load sensing" ability of the vacuum distributors that came as VW original equipment. Tuning Vacuum Advance The last step, after the total advance curve is set, is to dial in the vacuum advance if you have one. g. Apply included silicone heat sink grease to. It is very important to a true street car but is often disconnected (plugged) for racing. This includes the electronic advance as well as the vacuum advance. The vacuum-advance canister increases spark lead by 10 to 20 degrees in light-load conditions, but it immediately relaxes as soon as engine load increases and vacuum level drops. So the factories used either dual-vacuum distributors (two vacuum cans that worked against each other) or more commonly, conventional single advance with a temperature-controlled vacuum 'switch' that either disconnected the ported vacuum or switched to manifold vacuum when engine temps rose above a certain point. An example of total timing would be 12° initial plus 24° of mechanical which equals to 36° total. Your distributor is a "vacuum advance only" and has no centrifical advance function to it. 1957-74 8-Cylinder Ford Vacuum-advance Distributors. Idle AFR is 14. Leave it attached to the distributor. Adjustable Vacuum Advance; GM/HEI Distributor w/Vacuum Advance; Comes with detailed instructions. The vacuum line for the vacuum advance should be connected to a ported/timed vacuum source. 26 Jun 2017 . Ported vacuum with-holds vacuum advance at idle, no vacuum will be applied till the throttle blade moves past the port thus exposing it to the pressure inside the manifold. 09-24-08 08:37 PM - Post# 1528964 In response to Diehard50248 Jeff here is a corvette site with a great set of articles on timing and vacuum advance. Centrifugal advance described Vacuum advance described Pinking/pinging Select curve by Market and year Select curve by Engine number Select curve by Distributor number Browse all curves. distributor with vacuum advance. 5. Remove and plug this line. For static timing start with 12d BTDC. l-6-226 sw/pu/fc-170: $ 375. SELECT STORE . The vacuum advance canister, located on the side of the distributor, provides additional timing only when the engine is pulling vacuum. 4. Low cylinder pressure engines typically like lots of advance at idle and light throttle to make them responsive. 5. com. Distributor Rotor Retainer. The mechanical advance brings in 32 degrees + 4 degrees initial for 36 degrees total and 15 degrees vacuum. Power Products, Power Plus GM HEI Distributor, Chev SB/BB w/ Vacuum Advance, Black Cap. If the vacuum advance control The 009 distributor is a centrifugal-advance distributor. The excitement right now is in regards to their new programable distributors, the 123Tune series, where both the mechanical and vacuum advance curves can be customized and the changes installed even while you are driving. Generally, a 302 will like about 12-14 degrees advance for a base setting with the vacuum disconnected, and about 32-34 total (depending on compression, camshaft, elevation, etc. It contains all the curves for carbureted ID/DS-engines as originally specified by Citroen, for cars after July 1959. If a vacuum advance unit is being replaced, turn THE ADVANCE SETUP: Centrifugal and vacuum advance (non-computer controlled distributors ONLY!): Centrifugal advance assy. At idle it should be just about 0 and should as the engine speed increases to advance the distributor. Starts @ “Hg Vacuum is measured in “inches of Mercury. The distributor is mechanically advanced with a vacuum retard on later cars. . I. How does it work? As Engine Vacuum rises, it pulls on the diaphragm inside the canister. It wasn't until recently reading Cliff Ruggles book "How to rebuild and modify Rochester Quadrajet Carburetors" that he gives his two cents, on . It has been cool when I was street tuning so my IATs are around 80°F and coolant temp around 175°F. Need to change springs and speed up the advance curve slightly. Heating at idle is either not enough timing at idle (use manifold connected vacuum advance, or if no vacuum advance distributor, you need to shorten the centrifugal so you can run more initial), slow water pump speed (don't use underdriven crank pulley), or insufficient fan cfm( must be wired through relays with proper size wire which I prefer 12 gauge minimum and power direct from the battery . . 8:1 to 16+:1) High advance: VE table (low kPa), (main jet) Spark Advance table, (vacuum advance) n/a: Tuning for Economy, Tuning the Spark Table: Minimum Emissions: Stoichiometric: Moderate advance (slightly . 0L. I guess this is why in the manual it doesn't say to block off carb vacuum to the dizzy because it's just about non existant . You can choose the idle timing and at what rpm, all in timing and at what rpm, a rev limit, and timing due to vacuum advance as well as what pressure . If it does not move, it indicates a defective advance unit or hose. Verify carburetor is set to stock settings: Start bike, bring to operating temperature. It advances ignition timing at idle. And please, tell me why it matters, 'cause I don't know: I just know its more betterer than vacuum advance. This is fine tuning stuff, all of which assumes you have a healthy engine with good compression, a steady timing mark and a functional distributor vacuum/centrifigul advance, etc. If you send your distributor to a shop to be recurved they can get you pretty close to the correct . 25 Feb 2017 . It is made up of: A vacuum canister, A linkage, and; An advance plate attached to the trigger mechanism inside the distributor. e) Set the idle speed to 2600 rpm. Rotating the distributor counterclockwise will advance (increase) the timing. Inside this vacuum advance canister is a small diaphragm that is connected to a link on the advance plate (arrow) that mounts the magnetic pickup in the distributor. Rotating the distributor on such cars to fastest idle makes up for that, but ends up with way too much advance everywhere else. Also, when an engine comes under a load, intake manifold vacuum decreases. Setting Instructions: Counter-clockwise rotation reduces the vacuum, and do not turn more than 5 full turns because the screw can fall out. It is generally accepted, as Steptoe has said, to have all your timing in by about 3000rpm +/- 200 rpm depending on the engine. Carefully remove the distributor from the engine. Dual Advance Beginning with the '68 model year, Ford switched its inline sixes to a dual-advance/retard distributor with both a vacuum and mechanical advance like V-8s of the period. Ignition 123 TUNE - Electronic distributor (works with both positive and negative ground), optional vacuum advance. Vacuum advance is designed to give extra advance only at cruising speeds. The takeaway though is once you get the base distributor timing and centrifugal curve squared away, don't mess with it anymore, and adjust the vacuum advance last, the tendency though is to try to compensate for excessive vacuum advance by retarding the distributor timing. We use crankshaft rpm. Later cars adopted transistorized or electronic ignitions, often with computers controlling advance. When the throttle is partially open (highway cruising), manifold vacuum is high. Attach a vacuum gauge to a constant vacuum source. My Streetfire HEI distributor came with instructions, and extra parts, for adjusting the vacuum advance to control how much advance it provides. The proof is in the test drive and the performance of the tuning, your mileage may vary. 1 Nov 2006 . Not a good thing. 1 Mar 2021 . If vacuum for more than one component is needed, use small plastic vacuum fiTfls (available at most automotive stores). Also, since timing advance is important to Pontiac engines, the mechanical advance can easily be adjusted with the supplied advance springs and stop bushings. The vacuum advance is calibrated for maximum fuel economy and light throttle ping is eliminated. New motor put a new distributor in and not that chinese crap from your local auto parts store. Advice on 308 timing adding vacuum advance: Hi guys, needing some thoughts on timing. Sure, there are those who will claim their engine runs fine without that cheesy little can hanging off the side of their distributor. Add To Cart. so,here's the . Ported distributor vacuum advance was a result of early 70's emission equipment. €24. That fine tuning venire feature of the Healey's distributor . Shop for Proform Black Cap Chevy V8 HEI Distributor Fits 1955-1982 Engines with confidence at AutoZone. i. Other good ideas to help tune up your HEI include an adjustable vacuum advance canister. Check all parts and replace if worn. 4) Connect one wire of the test light to the low tension contact on the distributor, and the other wire to a good ground. They also implemented "IMCO", which employed a vacuum RETARD feature to the distributor vacuum system to further delay spark advance. ( 8 ) Estimated Ship Date: Today. The factory center bushing on our Duraspark Distributors is replaced with a full length bronze oil impregnated bushing to provide increased durability and cure top end timing fluctuation, which is a common problem in these distributors due to the . (The low tension contact is where the thin wire from one side . rpm comes up) under light to medium throttle settings. Via Bluetooth you can create custom timing tables for your application. of the vacuum advance knob on the Lucas Distributor, car is a 64BJ8. Adjustable vacuum advance kit that allows fine tuning of the advance to specific applications. Connects to the ECU box with a 2 wire connector. It is not uncommon to find it at 10 or 12 degrees. The total vacuum advance is listed in crankshaft degrees. Note: The curve in the graph is based on ignition (distributor) rpm. vacuum advance control unit will pull in at its maximum (i. The limiting factor for vacuum advance is the same as it is for ignition base timing — predetonation or pinging. Chevrolet SB/BB. Available for all GM points-style, T. Where do you source vacuum from in order to get your vacuum advance to actually work for you instead of leaving you and your handy carb-tuning screwdriver and distributor wrench to the task of trying to find the sweet spot? Watch below and see if that helps the mystery out some: YouTube. The factory center bushing on our Duraspark Distributors is replaced with a full length bronze oil impregnated bushing to provide increased durability and cure top end timing fluctuation, which is a common problem in these distributors due to the . Rotate the distributor to get the correct advance setting, then turn off the engine and tighten the hold-down clamp. Pull over and either advance or retard the timing by about 4 degrees. The purpose ideal of ported vacuum . My question is hooking up the vacuum advance. So to compliment the performance curve of our distributor, we must now replace the stock vacuum advance unit with a unit that will give us a total vacuum advance of not more than 16 degrees. All good I thought but then you . condenser, capacitor, wiring harness, and adjustable vacuum advance (available . Remove distributor primary wire connected from distributor to negative terminal of coil. It has no vacuum advance component at all. The free app enables you to adjust the advance curve. The vacuum advance will be in . Adjustment. A tuning note on this: If you choose to run straight manifold vacuum to your vacuum advance in order to gain the additional timing advance at idle, you must select a vacuum advance control unit that pulls in all of the advance at a vacuum level 2” below (numerically less than) the manifold vacuum present at idle. This is called static timing, and where you begin tuning. 10 Nov 2004 . This is too much advance for any car to handle, and will result in the car jerking and bucking severely at cruise speed. 4. I have already disposed of all the emission related items, and would like to relocate the hose, to the vacuum . 00 * r/b: 931339 rebuilt auto-lite/prestolite iat distributor with . + -. Vacuum advance works by using a manifold vacuum source to advance the timing at low to mid engine load conditions by rotating the position sensor (contact points, hall effect or optical sensor, reluctor stator, etc. 00 US. The vacuum advance is calibrated for maximum fuel economy and light throttle ping is eliminated. $34. Total vacuum should be determined by adjusting to avoid pinging at light acceleration. Next, remove the vacuum advance hose from the carburetor and plug it with a rag to check your timing. com) in Shakopee, Minn. Holley vacuum port diagram further holley carburetor diagram along with quick fuel carburetor . The correct adjustment of a vacuum advance unit is critical to ensure that an automobile engine runs at its peak performance. Distributor Vacuum Advance Take Off - posted in Engine, Transmission and Tuning: Article by Keith calver which those asking the vacuum . While the float is off, shake the float for any signs of fuel in the float. With full centrifigal advance, it has a 12 degree advance plate and a total of 24 degree total advance. Works great on and off the track. THIS KIT INCLUDES THE CAP, COVER, ROTOR, MODULE, COIL AND MISC HEI DISTRIBUTOR PARTS. Mostly used in Citroen DS, Traction-Avant and HY. The vacuum advance system consists of a vacuum motor connected to the base plate of the distributor. b) Connect timing light to the battery and number 1 spark plug wire. Many people who tune engines disconnect the vacuum advance mechanism, and indeed on some distributors it is very hit and miss in operation and can cause anomalies in the timing. ) There are two kinds of canisters: the old kind can be taken apart and, by putting in various pieces of tubing, you can govern how much vacuum advance the canister will allow. This means a vacuum source that is above the throttle plates. I idle at 29-31 kPa at 900 RPM. Remember if spark plug wires have to be removed from. The timing should be the same for all big blocks 392-502. I have tried them all and nice new GM seems to work the best. This is too much advance for any car to handle, and will result in the car jerking and bucking severely at cruise speed. Vacuum Advance – Traditionally controlled by a mechanical device called a vacuum advance canister that physically moves the advance mechanism inside the distributor. Vacuum advance would best be set by curving the centrifugal first, then using an adjustable vacuum advance like the one we used to get from Crane and dial in as much centrifugal as it will tolerate. 99. In fact, the reason you must measure initial and total . Connect gauge to a source of manifold (constant) vacuum. That is the reason why the Edelbrock-Weber comes in one of two ways: a timed vacuum port and a full time vacuum port. ” Thus, manifold vacuum is measured and referred to as “Hg. CHOOSiNg aN aDvaNCE CUrvE So, it is not easy to select the best distributor, and the worries really start with an upgraded camshaft. Given the slew of variables most high performance (or race) distributors do not make use of vacuum advance (case-in-point is the MSD Pro Billet Distributor shown in the . Proform Adjustable Style HEI Advance Vacuum Canister Distributor Tune-Up Kit $ 19. 65 - 70 Distributor rotor. With the vacuum advance canister disconnected and vacuum source port plugged, the initial timing is set to 15* BTC - total timing kicks-in @ 2600-3000 RPM's, and now at 33* BTC. Tuning with a Digital air/fuel meter Vacuum advance only affects timing, not mixture. I set the initial at 15degrees and the total . In engines with an HEI distributor, variable ignition timing is controlled by engine vacuum advance and centrifugal advance. 3. Many of these engines will also use a vacuum . IGNITION TIMING - DISTRIBUTOR - MECHANICAL & VACUUM ADVANCE. CA . For non-APlus . Disconnect the distributor vacuum advance and plug the line. ” Mercury has the chemical symbol “Hg. Small Cap Standalone Billet Distributor All New, Billet Case Billet housing, all new precision construction, small cap style uses external coil (not included). Distributor Upgrades. Time to upgrade to an all new LC Engineering Pro Distributor. The total timing of the distributor, reported in degrees, . The vacuum diaphragm in your classic car won't last forever. Apr 8, 2021. This unit offers vacuum advance as well. As the throttle moves toward WOT at some point the manifold pressure and atmospheric pressure become nearly the same, thus no vacuum is present with a normally aspirated engine. Adjustable Vacuum Advance Kit - Point Triggered Distributors. Finally got around to swapping out the advance stop bushing on the MSD #8361 distributor in my Camaro. used real gas and we could set the total advance to 25 with 5* initial and have the vac . Adjustable Vacuum Advance. I have an aftermarket Accel distributor in it much like the MP electronic distributor. 123NV. The distributor's centrifugal timing advance mechanism makes the spark occur sooner as engine speed increases. At idle, the engine needs additional spark advance in order to fire that lean, diluted mixture earlier . 5 whp at peak, and a consistent 21-22ft/lbs of torque from peak to 2300rpm and a consistent increase all across the board. When Note:When checking initial and total advance, always disconnect the vacuum advance hose. The vacuum advance mechanism adds extra ignition timing at part throttle to improve economy and performance. The problem with this method is that the high manifold vacuum conditions at idle make it respond well to a lot of advance but until the mid ’70’s MG’s had no vacuum advance at idle. Loosen the distributor just enough so that it can be rotated with little force, but will stay in place. This is the last Jeep six-cylinder ignition to use a vacuum advance mechanism in conjunction with a mechanical/centrifugal advance unit within the distributor. The process of finding the minimum initial timing required a warmed engine and plugging of the ported vacuum advance port from the carburetor to the distributor. Turn on the ignition switch. 00 * r/b: 923067 rebuilt auto-lite/prestolite iat distributor with vacuum advance. A tuning note on this: If you choose to run straight manifold vacuum to your vacuum advance in order to gain the additional timing advance at idle, you must select a vacuum advance control unit that pulls in all of the advance at a vacuum level 2” below (numerically less than) the manifold vacuum present at idle. 280Z MT Code:12-3074 Price: $68. It has no vacuum advance component at all. Billk. When vacuum is applied to the canister it pulls the rod, and this pulls on the pickup coil. By rotating the . The distributor’s mechanical advance is 6° @ 900 RPM, 8° to 10° @ 1200 RPM and reaches a maximum of 10° to 11°@ 1500 RPM The vacuum advance provides 10° of advance. 3 . 4-Cylinder Ford Pinto/Mercury Motorcraft Vacuum-advance Distributors, 2300cc Engine 4-Cylinder Ford Pinto with Bosch Distributor, 2000cc engine Ford, Mercury (US, with Bosch . 7. The Load-O-Matic distributor is only equipped with a vacuum advance. Distributor Advance, Mechanical, 1 Pair of Springs, Ford, Kit. Tuning: Setting Initial . If you trying to total the engine at 36* you would simply set the idle timing at 18* and this bushing will allow it to advance another 18* to bring your total to 36*. Adjustable Vacuum Advance. 29 Mar 2008 . 19 Apr 2017 . This carburetor doesnt have the vacuum exit on the bottom for the vacuum . Then retard the timing until the vacuum gauge reading drops slightly, approximately one half to one inch. The distributor in the Volvo B20B has a total (max) mechanical advance of 13. The timed spark fitting in the choke side of the primary metering block provides vacuum for the operation of the distributor vacuum advance. CSI distributor does not use the vacuum advance. for "air injection reaction". The only real common thing is get all the advance in by 3,000 and aim for 36deg total mechanical. Free In-Store or Curbside Pick Up. The timing should be the same for all big blocks 392-502. Designing an Inexpensive Distributor Machine Based on the above description of using the car itself as a distributor test machine, it should become apparent what has to change to get the distributor off the engine . The vacuum advance control unit on the distributor is intended to advance the ignition timing above and beyond the limits of the mechanical advance (mechanical advance consists of the initial timing plus the centrifugal advance that the distributor adds as rpm comes up) under light to medium throttle settings. This distributor has the vacuum diaphragm pulling the plate CCW, therefore it is arranged for vacuum retard. The distributor has a 2-pin connector that plugs directly into an MSD Ignition. If the distributor's mechanical advance provides 20 degrees of crank advance, and you set the initial lead to 15 degrees, your engine will have 35 degrees of total advance at high rpm. The idea is to insure the vacuum advance is NOT activated. This The auxiliary timing advance or bottom vac-can on the distributor is supposed to be hooked to intake vacuum. 11. Rotating the distributor clockwise will retard (decrease) the spark timing. With an ever-expanding line of SuperCoils and all the spark plug wires, tune-up kits . The 123\CITROEN-4-R-V (also known as 123\DS-R-V) is a distributor, specifically targeted for the Citroen ID/DS. As an engine comes under a load it cannot tolerate as much spark advance. For example, at 4 turns in, the canister begins to advance timing at 6 inches of manifold vacuum, with a maximum of 14 crankshaft degrees with vacuum at 12 inches. Vacuum advance. It's set up to keep enough . Sorry! I am not an expert on the trucks, but I do know that 1949-51 Ford passengers cars used an all-vacuum advance distributor with no mechanical advance. It provides ignition timing advance in response to a vacuum signal. the limits of the mechanical advance (mechanical advance consists of the. Bosch xxx078 distributor with Vacuum Retard. This is for the point triggered distributor, instructions are included. Im running a 5K engine with a 4K engine carburetor from a Starlet. Grasp the distributor and slowly, very slowly begin rotating it to the right, clockwise. tuning note on this: If you choose to run straight manifold vacuum to your vacuum advance in order to gain the additional timing advance at idle, you must select a vacuum advance control unit that pulls in all of the advance at a vacuum level 2" below (numerically less than) the manifold vacuum present at idle. You can find them for about $52. The distributor's centrifugal timing advance mechanism makes the spark occur sooner as engine speed increases. ) Start with 10 as a base to be safe while your efi tunes, as running lean and too much advance don't . turn the distributor for the highest vacuum while keeping it at it's desired idle speed. But, since so many Bugs on the road today are equipped with the 009 distributor, we must address the methods by which it is properly tuned. We go over the process of setting you distributor timing. Vacuum advance will improve gas mileage and drivability of a street driven car. Also Wastegate actuators for more modern Turbo Diesel Vehicles and provide parts for many . The distributor phasing has been checked and corrected as necessary IMPORTANT Distributor vacuum port on carb disconnected and plugged at carb ATTENTION -195 degree high flow thermostat- ATTENTION THIS IS IMPORTANT 60%water-40% coolant with a bottle of water wetter Due to the lack of appreciable vacuum at throttle settings applicable to performance applications our total timing is less the amount provided by the vacuum advance system. Power time the engine at 3,000 rpm's. PVT25-3926. Push on distributor ends. Not legal for sale or use in CA. The centrifugal is easily curved on a GM distributor using one of the available kits. Watch your vacuum gauge. Summit Racing SUM-850426 - Summit Racing® Vacuum Advance Canisters. 9 Oct 2015 . c) Loosen the distributor hold-down clamp so the distributor housing may be rotated by hand. Includes cap, rotor, distributor shaft O-Ring and everything you need - no external ignition box required. Vacuum advance on a Ford should be hooked to ported vacuum, other wise it can cause all kinds of driveability issues. pump, etc. The plate on which the once-piece points assembly mounts is also movable by vacuum, in this manner, vacuum also adjusts the timing. Vacuum advance tuning is very combination-specific. 1972 El Camino said: After reading and reading the debates and explanations of manifold versus ported vacuum to the vacuum advance unit, i have to say my stock 350 performs better using ported vacuum. e. If you trying to total the engine at 36* you would simply set the idle timing at 18* and this bushing will allow it to advance another 18* to bring your total to 36*. Bottom Left: With the distributor running at 500 rpm crankshaft speed, we had zero advance as noted by the arrow pointing at the 4-6-8 0/360° mark to the left of the knob on the 360° ring on the face of the Sun machine. Second ensure that your distributor, plugs and plug leads are in top shape. For any kind of extensive tuning of the mechanical and vacuum advance, it is far preferable to test the distributor off the car. The vacuum line on the single-vacuum dual advance (SVDA) distributors must be removed from the vacuum canister on the distributor and plugged to prevent air from being sucked into the carburetor during timing. This done by removing the vacuum line at the canister on the distributor and inserting the 3/32 inch Hex head Allen wrench, Slightly loosen the distributor hold-down bolt, just enough so that the distributor will turn a little Rotate the distributor to change the timing. Tuning with Vacuum I see a lot of discussion and confusion regarding the use of Ported Vacuum versus Manifold Vacuum for distributor vacuum advance. To adjust with the distributor, grab a vacuum gauge, timing light, and distributor wrench. This is fine tuning stuff, all of which assumes you have a healthy engine with good compression, a steady timing mark and a functional distributor vacuum/centrifigul advance, etc. 17 Feb 2010 . It shows an electronic dashboard. Point distributors have mechanical advance consisting of weights and springs and a vacuum pot which allows for additional timing advance, controlled by carburetor "ported" vacuum. baseplate, are direct (below the butterfly) manifold vacuum sources. Hesitation or stumble at throttle tip-in can be caused by a defective vacuum advance in the distributor. 7 Jun 2016 . 99% of the time with even a mild performance engine, use the manifold (full) vacuum port for your ignition timing. Vacuum advance is supposed to be ported vacuum, not manifold vacuum, you should not have vacuum advance at idle. Advanced the distributor and raised it to 20+ but I backed it down to about 19. The first step in tuning an advance curve is to determine the maximum ignition advance the engine can tolerate, and subtract from that figure the initial static advance. Scott Drake DD-190 - Scott Drake Vacuum Advance Cylinders. Tuning Vacuum Advance The last step, after the total advance curve is set, is to dial in the vacuum advance if you have one. Many enthusiasts don’t realize just how important vacuum advance is to street performance. Disconnect and plug vacuum advance. Take this reading at the RPM where your distributor is at max advance (on the test engine it was at 3100 RPM). I tried the Crane vacuum set with the cam to limit total timing,the car had an Accell adjustable vacuum can . Initial, Centrifugal, Vacuum. Complete Bolt-In Replacements for HEI Chevrolet V8 Engines Now there's no need to build your own high-output distributor that you can tune for . It does not have the "load sensing" ability of the vacuum distributors that came as VW original equipment. The HEI is a great distributor for a street or street/strip car. Instead of a spark control valve, the Autolite 1100 carburetor provided a throttled vacuum signal instead of a valve-controlled vacuum signal. B. Quantity in Basket: none Distributor Vacuum Advance, 74 260Z Code:12-3073 Price: $71. Connect the hose to the distributor, spark delay valve, and/or temperature . initial advance (adv_offset + ign_table(idle)): this is the rough equivalent of the old 'idle advance with the vacuum line disconnected' figure. My 1982 460 has the distributor vacuum advance running to a manifold vacuum tee (as per the sticker under the hood) I assume Ford had it this way, with all the emission crap it was built with. Engines getting about 14 hg. Includes Allen Wrench For Adjustments. Duane Spenser recommends 28-32 deg advance at 3000 RPM. Total 34 degrees. Be sure all vacuum lines are Distributor Curves. Disconnect the vacuum advance and plug the carburetor end. Vacuum-type distributors use engine vacuum to speed the spark. Link to progression Ignition webpa. A lot of guys think a vacuum advance hurts performance, this is not true. Slacken the distributor clamp bolt, and with the engine still at idle, advance or retard the ignition until the highest steady vacuum reading is obtained. The vacuum advance control unit on the. To remove the breaker point plate you will need a small Phillips screwdriver for the two little screws on the plate. Part No . 4. ” Right: The best way to check the advance curve is with a Assuming a motor's optimum total advance is 36°, its optimum initial advance is 16°, its vacuum advance is limited to 10°, and it idles at 1000 rpm. Now here is the problem. , 10* of distributor advance is 20* of crankshaft advance. I have not used vacuum advance on my distributor for going on 4 years and my car runs just fine. l-6-226 sw/pu/fc-170: $ 375. 95. HEI Distributor Cap and Rotor are precision molded from advanced polymers with solid brass contacts and low-resistance center coil brush C. At idle, the engine needs additional spark advance in order to fire that lean, diluted mixture earlier . Within the settings there is also an immobilizer integrated to secure your car with a state-of-the-art anti-theft system . The vacuum advance canister rod, the part that actually does the pulling, is attached to the pickup coil in the distributor. Part # 66952C. Initial and total timing with an MSD distributor. Discussion Starter · #1 · 2 mo ago. In its simplest form, the vacuum advance system consists of a chamber with an airtight diaphragm sealing the carburettor from the distributor and connected to both by a pipe. Centrifugal advance is used to advance engine ignition timing relative to an engine’s RPM. See details below. Outside of the E-Curve, choosing and tuning an MSD distributor is easy. Vacuum advance is tricky to tune because there is no direct measurement like total. Standard Electronic Distributor: Provides precise timing with a 6 point reluctor and low voltage electronic pickup. My initial at idle is 20 degrees and total is 35 degrees all in around 2800 to 3000 RPM. If you have vacuum advance, leave the vacuum CONNECTED while you do . r. Please take a look in the advance curve table of the specific unit for . Perfect for budget minded. . Advance the timing until maximum vacuum is achieved then retard it about one pound. initial timing plus the centrifugal advance that the distributor adds as. distributor is intended to advance the ignition timing above and beyond. Disconnect the distributor vacuum advance and plug the line. This machine enables fast and accurate testing, troubleshooting and calibration of the distributor mechanical and Vacuum (if fitted) ignition advance mechanisms. For fine-tuning your vacuum advance and optimum performance. 14 Jul 2016 . Otherwise you will get very high timing readings. d) Start the engine and allow it to warm up fully. . Im running an msd pro billet in my 308 15° intial 33° total no vac advance which I know is basic ballpark for a 308. , and Unitized Ignition distributors, as well as selected non-HEI aftermarket units, advance correctors are easy to install and restrict the vacuum control . Silver 25* bushing came out and the 18* black one went in. Tighten the distributor clamp to lock the distributor in place. And the best part is that its really easy to do and costs less than $50 more than their standard distributor. The proof is in the test drive and the performance of the tuning, your mileage may vary. Ported vacuum: 16° initial advance + 20° centrifugal advance = 36° total. My MSD distributor has vac advance so that hooks up to. The vacuum advance is an Ignition Timing control mechanism built into some distributors. We picked up 4. Now for the carburetor vacuum balance check. 5 degrees (+/- 1 degree). Conditions are as follows: new distributor did affect overall total timing. This car was originally a 6 cyl and understand the 308 engine was out . Advance the timing on the distributor to correct this problem, and recheck vacuum. you can start the tuning process by setting the initial timing to at least 15 degrees BTDC. s. programmable vacuum-advance and boost-retard curve ( 0 to 200 kPa or -30 inHg to +15 psi ). Low rpm performance will be good, and high rpm power will be good, and the thing won't ping. To better understand what the Crane Adjustable Vacuum Advance does, I will try to describe it. B7A-12127A: Centrifugal Advance Data (Degrees @ RPM of Dist. I've never messed with distributor timing advance systems in depth. The only time the vacuum advance adds timing is at part throttle, low load conditions when there is manifold vacuum. Sorry! I am not an expert on the trucks, but I do know that 1949-51 Ford passengers cars used an all-vacuum advance distributor with no mechanical advance. 4 Jan 2004 . 27 Jun 2010 . Ready to install. 68 retard the distributor to a number less than 8 , then re-measure everything again. Pro Distributor (w/ Vacuum Advance) When was the last time you checked your ignition timing? If you are like most people it has been a while! An old worn out distributor can cause major tuning issues along with robbing your performance. At book idle spec, advance distributor timing . If vacuum for more than one component is needed, use small plastic vacuum “T”s (available at most automotive stores). The purpose of the vacuum advance is to provide spark advance when the engine is not spinning fast enough to create the centrifugal advance talked . Vacuum advance for you motor, nbot a stock motor, should be for idle/low speed high traffic operation to aid in cooling. 5. Top: We put the Sun 404 distributor machine to work on the vacuum advance modifications of the distributor. Now you are lost in a multitude of choices: North American 009, Kühltek 009, Bosch 010, Bosch 050, Pertronix Billet Distributor, and Magneto. If you have a stock distributor and know either the timing at idle or the maximum advance at a given engine speed and you have a good timing light, you will have no trouble setting timing. MSD Performance Partnumber: 5597. This recurving operation usually takes me about an hour or less. Muscle car vacuum advance distributor. Enlarge the port using a selection of long and really . By doing this, you are retarding the timing. The vacuum advance for a longer cam, though, will need rethinking. Tuning Your GM Distributor For More Power. As you advance distributor timing the vacuum indication and RPM will . 3) Loosen the distributor clamp to the point where the distributor may be rotated freely. 14 Sep 2012 . You are now advancing the timing. improve power, throttle response, and economy!!! this is the most misunderstood item on oldschool carbureted engine tuning. Timing the ignition, then, is a matter of getting the timing correct at one end (idle or full advance) and letting the rest of the range look after itself. Advertisement The best way to check both the vacuum and mechanical advance curves is on a distributor test stand. The vacuum advance mechanism allows the distributor to vary the spark timing to compensate for the load and speed requirements of the engine. The source of the vacuum advance signal is usually the carburetor’s “spark port. If the distributor's mechanical advance provides 20 degrees of crank advance, and you set the initial lead to 15 degrees, your engine will have 35 degrees of total advance at high rpm. I have the advance plate set at a 15 degree timing curve. UK cars from August 71 to November 73 had the 18V 581/582/583 engine with HS carbs with the ported source from the rear carb, and the 25D4 41228 distributor. . even . After removing the two little screws, swing the plate up and over the center post pivoting on the spring linkage of the vacuum advance. Lucas 41322 (Late Series 2, with vacuum retard) A succinct but useful discussion of Jaguar’s use of vacuum advance and retard distributors, by Dick Maury, can be found here. The ideal distributor will allow you to easily adjust the mechanical advance rate, amount of advance from the mechanical advance system and vacuum advance unit. rpm comes up) under light to medium throttle settings. Parts are just part of what we do. ( 25 ) Estimated Ship Date: Today. For any engine that spends time on the street, it is to your engine’s benefit to not only use the vacuum advance, but to be able to tune the amount of advance and . Compare. should I re-time and tune going off that port without vac advance in gear based on . With ICE systems, the vacuum advance is controlled electronically via a MAP (Manifold Absolute Pressure) sensor built into the ignition control. My Bad !!! Edited 5/26/12 . Advance the timing until maximum vacuum is achieved then retard it about one pound. Download Installation Instructions in PDF format (152 Kbytes). Add to cart. Centrifugal advance is the COURSE advance, and it's directly related to engine RPM. Electrical Firing. Simple ported vacuum will not work on distributors designed and tuned to work with manifold vacuum. Many people who tune engines disconnect the vacuum advance mechanism, and indeed on some distributors it is very hit and miss in operation and can cause . $235. Some relocate the IAT in a cold place (cheap but small power gain) and others drilled a new position for the CPS to get 3-4 degrees variation. Joined Sep 30, 2005. The Aldon Yellow distributor is a modern version of the old Special Tuning high performance "S" distributor. . Racing distributors don't use vacuum advance because the gas pedal is always down. To install 3 bolt SAAB 900 (0 237 021 014 or 0 237 021 045) or Polo Distributors. incl. Open the distributor cap and see if the rotor is pointing at the #1 . to read the ignition timing spark advance from the distributor. Advice on 308 timing adding vacuum advance: Hi guys, needing some thoughts on timing. It has a 6M-2L ignition and MSD Marine distributor. My Bad !!! Edited 5/26/12 . 2. Instantly increase your horsepower. Time to upgrade to an all new LC Engineering Pro Distributor. 5. If that big block is a low compression engine, you'll probably want to run vacuum advance. Tuning with a Digital air/fuel meter Available for all GM points-style, T. Another type of advance is vacuum advance, which is an add-on advance. But there is one particular vacuum advance unit that is referenced for high performance big blocks. In its simplest form, the vacuum advance system consists of a chamber with an airtight diaphragm sealing the carburettor from the distributor and connected to both by a pipe. Hello, I recently bought a new MSD billet distributor with vacuum advance for my 289ci motor. MK, XK & XKE (6 cyl, positive AND negative ground ) 123TUNE. Removal of the vacuum advance bellows. Take the top of the carburetor off and check for debris in the needle & seat, also inspect the needle tip to be sure it’s not compromised. They’re built for everything, from powerful street cars to racers. This vacuum signal is routed to the distributor and "pulls" on the vacuum advance canister to create more ignition timing. The Ford Dura-spark distributor is an inexpensive and reliable alternative to the expensive aftermarket distributors. In particular the vacuum and centrifugal advance mechanisms need to be perfect (sticking is common), there must be no air leaks. If your distributor has a metal window in the cap and an oil fill tube with a lid, and is made of cast-iron, then this will fit your vehicle. Quantity in Basket: none Distributor Vacuum Advance, 75-78 Cal, 75-76 Fed. Maximum possible spark advance. Why do distributors have vacuum advance? . (Remember to pay attention to "crankshaft advance", because it is double the distributor advance, e. Not legal for sale or use in CA. test or tuning procedure that can be performed with a vacuum gauge. Found true tdc (was 2deg out) Set the timing at 28deg BTDC at 3500rpm with the vacuum advance disconnected. Distributor Vacuum Advance Line Connections 1955/56/57 Thunderbirds. Get yours online today and pick up in store. If this type of carburetor is used on a supercharged If you expect your supercharged engine to perform as it should, the distributor advance curve will have to be tuned for the unique needs of “artificial respiration. Okay, now hook up the timing light and get it pointed to the timing marks. If the vacuum advance control And, because the vacuum both causes the need for the advance and supplies advance, the solution is at all times perfectly matched to the problem. Distributors without a vacuum advance canister are usually set up with full mechanical advance, it makes them run great but is horrible on fuel mileage. The ignition system appears conventional. The very late model, aftermarket ‘Model 1-1’ Stromberg 97 did have a vacuum port for these distributors but they take vacuum from more than one place in the carburetor. Vacuum adv distributor with heavy enough springs to hold advance until 1200 rpm. Disconnect the distributor vacuum advance and plug the line. Step 5 Remove cap from Mallory distributor. The vacuum advance control unit on the. Its simple, easy to tune, . VACUUM ADVANCE 1. Discussion in ' Engine Topic ' started by DesmoEd, Mar 21, 2021 . 75. Use continuous rubber tubing between car an distributor instead of thread on line and metal tube. Other manufacturers followed suit, GM's version of Thermactor was called A. But first, what kind of distributor are you running? 29 Jan 2019 . This kit allows to install non computer controlled ignition systems. 10 Jul 2016 . In this design, timing is controlled at the ECU computer. Idle is 12deg BTDC. The Swiftune version of the. If the distributor being replaced is equipped with a vacuum advance canister, note the direction the vacuum advance canister is pointing and disconnect the vacuum advance hose. Most distributors include a vacuum advance mechanism, which consists of a diaphragm vacuum canister, an arm from the canister to the breaker plate, and a hose connected to an engine vacuum source. Loosen the distributor hold-down plate using the 9/16-inch distributor wrench. Otherwise you will get very high timing readings. 68 This product is not currently available. This is essential in race engines, since timing is critical to life and performance. Replace the vacuum advance hose. Now, reconnect the vacuum advance hose and while accelerating the engine to approximately 1500 rpm, observe the movement of the vacuum advance arm. Connect the vacuum hose to the vacuum advance canister. You should be able to check manifold VA by checking timing with the hose connected vs with the hose disconnected and plugged at idle. The curve is faster than the "S" and thus is slightly quicker in engine response. Remove distributor cap, rotor and vacuum advance canister. Includes Allen Wrench For Adjustments. Distributor Advance, Mechanical, 1 Set of Springs, Mopar, Kit. The vacuum advance control unit on the distributor is intended to advance the ignition timing above and beyond the limits of the mechanical advance (mechanical advance consists of the initial timing plus the centrifugal advance that the distributor adds as rpm comes up) under light to medium throttle settings. Vacuum advance also adds timing to the engine, hut it is based on engine load and is controlled by intake manifold vacuum. OR; 2) Reduce the Vacuum advance to a point that 35 is achieved. Roughly set the initial timing so that the engine runs. In the picture that had the mechanical and vacuum advance settings. Ported vacuum is also the signal for a distributor's vacuum advance mechanism. USB port for connection to laptop for infinite tuning options. . It features a high quality, fully adjustable mechanical advance and an accurate magnetic pick-up trigger. Maximum possible spark advance. 1 - 4 of 4 Posts. Mechanical spark advance controls based on engine revs and load (manifold vacuum) • Numerous add-on mechanical devices to achieve exhaust emissions standards beginning in the sixties, which caused many engineers to go prematurely gray • Beginning in the late 1970s – Give the distributor rotor an anti-clockwise twist to verify the mechanical advance mechanism is free to move. Vacuum advance has absolutely nothing to do with total timing or performance, as when the throttle is opened, manifold vacuum drops essentially to zero, and the vacuum advance drops out entirely; it has no part in the "total timing" equation. The longer the cam, the sooner the vacuum canister needs to start pulling in advance. Do plug the ported vacuum port on the carb, where the vac advance should be hooked to, per FSM. Note: It is recommended to have a dial-back timing light, timing tape or a fully degreed balancer to set the timing correctly. Pit Stop USA sells Proform Performance Parts Cap/Coil/Dust Cover/Hardware/Module/Rotor/Vacuum Advance Distributor Tune Up Kit Black at low everyday prices. Steady low between 15-18″hg vacuum: This low reading indicates retarded ignition timing. For any kind of extensive tuning of the mechanical and vacuum advance, it is far preferable to test the distributor off the car. If you wish to use the 4150 or similar base carburetor,it is generally accepted that you need a 1957, or later, distributor for the correct vacuum signal for the advance in the distributor as well as the 56 distributor has two diaphragms. Where you pull your vacuum signal can affect the distributor’s vacuum advance curve. Much like ignition base timing, the more vacuum advance timing you have, the better your performance. The vacuum advance is manifold vacuum as the distributor has a map sensor not a diaphragm like a typical vacuum modulator. Ford, FoMoCo, Motorcraft, Autolite Vacuum-Advance Distributors: 1949-74 6-Cylinder Ford Vacuum-advance Distributors. Fuel pump pressure is too high. centrifugal advance curve starts at 1200 rpm, ends at 2800 rpm (10° per 800 rpm) To adjust with the distributor, grab a vacuum gauge, timing light, and distributor wrench. tuning note on this: If you choose to run straight manifold vacuum to your vacuum advance in order to gain the additional timing advance at idle, you must select a vacuum advance control unit that pulls in all of the advance at a vacuum level 2" below (numerically less than) the manifold vacuum present at idle. We set and test the advance curve of each distributor on a Sun distributor testing machine for optimal performance with vehicles using 4-cylinder, vacuum-advance, points-based Hitachi distributors. A pot attached to the side of the distributor creates the vacuum advance. Vacuum Advance – Traditionally controlled by a mechanical device called a vacuum advance canister that physically moves the advance mechanism inside the distributor. We also attached a vacuum gauge to an intake manifold vacuum port. The 3000rpm total timing is for reference, IF you have a dial-back timing light. This results in a poor idle and power curve as the car is relying entirely on the centrifugal advance and has a vacuum leak as well. Designing an Inexpensive Distributor Machine Based on the above description of using the car itself as a distributor test machine, it should become apparent what has to change to get the distributor off the engine . Keep adjusting and measuring until the number is achieved. To do this reduce the RPM or disconnect the vacuum advance vacuum line. 00. But, since so many Bugs on the road today are equipped with the 009 distributor, we must address the methods by which it is properly tuned. 65 - 67/12 1600 Distributor vacuum advance unit. Increases Horsepower And Throttle Response. disables the vacuum advance (European JHs with Dellortos did not have a vacuum advance) is simple and keeps the distributor and spark plug wires in the same position, but it requires removal of the knurled nut mechanism that allows fine tuning of the ignition advance. Wish List. Tuning your engine using your own tablet or smartphone? The TUNE+ is the first wireless electronic ignition that you can program yourself using your iOS or Android Bluetooth 4. Thanks to John in Australia for supplying the data for the 41692, 41693 and 41695 distributors, the 41600 and 45DE4's, and the 40943 . It runs alot better with it hooked up. VW 16v '86-'97 Distributor Bracket kit. Pro Distributor (w/ Vacuum Advance) When was the last time you checked your ignition timing? If you are like most people it has been a while! An old worn out distributor can cause major tuning issues along with robbing your performance. Rotate the vernier adjuster knob until you achieve 13 degrees of advance (each click of the adjustment knob is equal to 1 degree of advance) Visit this link to see timing marks. That it is for distributor degrees. Attach a vacuum gauge to a constant vacuum source. 4 vac. About ACCEL. Includes Allen Wrench For Adjustments. When the carburetor is changed to one which is missing the proper vacuum port, obviously the vacuum signal is lost, so the centrifugal advance units ARE the proper distributor for this application. It is easier just to reduce the idle. And because the distributor turns half the speed of the crankshaft you have to multiply it by 2 to calculate the real advance. Setting Instructions: Counter-clockwise rotation reduces the vacuum, and do not turn more than 5 . Pull over and either advance or retard the timing by about 4 degrees. Others, however, consider vacuum-advance tuning a form of black magic and . Distributor Vacuum Advance, 70-73 240Z AT Code:12-3072 Price: $33. The vacuum advance will be in addition to the mechanical advance. I. B. 8. The SAAB distributors have both vacuum and centrifugal advance. Now install the carb and read the vacuum at the same RPM. Using a vacuum gauge to time your engine may be the best way to do it, . But the . Total advance from around 84-103 kPa from 2700-6500 is 42-44°. Not a good thing. While watching the vacuum gauge, slowly turn the distributor clockwise (advance timing) and look for a maximum reading on the gauge. ThunderHead289. Note the timing, this is your initial timing. Permits infinite adjustment. on the HEI is pretty darned good. In Stock. Some distributors will allow too much vacuum advance. It looks like the 396 had an initial timing of 4 degrees. ment of the distributor's advance mechanisms is illegal except for racing vehi-cles, which may never be driven upon a highway. Typically it would be a port on . Footage taken from Holley Carburetor Installation & Tuning DVD. the one on the carb. Now get the engine running again and note any misses or firing problems. I went up one size with the main jet, re-built the carb with new acc. If your car features vacuum timing advance in addition to mechanical timing, and you'll need to loosen the distributor adjustment bolt before you start the engine. Initial will really depend on your build and your location. These distributors are available from AMC to the famous W-Chevy motor. If you are not going to change your distributor, set the igni-tion advance statically to 13 degrees before disassembly. It is not uncommon to find it at 10 or 12 degrees. Proform Adjustable Style HEI Advance Vacuum Canister Distributor Tune-Up Kit $ 19. If your car has a fully centrifugal advance style distributor, set the initial advance to 3 to 4 degrees at 850 RPM. The MSD distributors come with 3 bushings with the largest one being 18* so when installed it will give you 18* of mechanical advance. If your distributor has a vacuum advance canister, it should be disconnected while setting the timing. 6. , and Unitized Ignition distributors, as well as selected non-HEI aftermarket units, advance correctors are easy to install and restrict the vacuum control . 00 * r/b: 922509 rebuilt delco remy 1110249 distributor with vacuum advance. The CNC-machined aluminum body and hardened steel shaft, guided by a sealed ball bearing on top and a sintered steel bushing on the bottom, ensure stability up to . Also, remember to disconnect and plug the vacuum line when setting the timing curve. For fine-tuning your vacuum advance and optimum performance. I find a new GM performance distributor 1103952 which you can get from Summit Racing, Jegs or probably your local dealership gives you the least amount of issues. When spark timing fails to meet engine needs, a faulty vacuum canister or sticky centrifugal weights and springs can be the cause. Re: LPG ignition advance with carbureted car. AFR at WOT is set for 12. For . 25 Dec 2013 . C3 Tech/Performance - Holley carb installation and vacuum line and your AC vacuum lines should be hooked to this manifold port. Clean off the area around the distributor opening. Likewise, how do you adjust a carbureted engine? Carb Quick Guide. f) Set the timing to 32 degrees BTDC. Now most distributors use a mix of manifold (or ported) vacuum, and centrifugal weights to compensate for speed and load. Remove old module and clean mounting surface. The vacuum advance canister is factory set to produce 5-7° crankshaft advance at 15” of vacuum. Engines getting about 14 hg. At idle, a spark ported vacuum system provides zero vacuum advance where the older manifold vacuum advance system might have provided as much as 10-12 degrees additional timing. Many of these engines will also use a vacuum . The previous owner said it had tuning issues but wasnt able to help as to why the line was disconnected. Right side engine view reveals a distributor, spark leads, a remote coil/ignition module (ICM) and the MAP sensor. And not with the 1949-53 Ford flathead Loadamatic distributor, which has no static mechanical advance and needs a special, compatible carburetor. Mopar Distributor Limiter Plates only $35. Barry's Vacuum Advance Tuning Instructions: Get an HEI recurve kit from CRANE (NAPA Auto Parts has them) and follow the instructions: 1. For the most part, Performance Distributors recommends that you use manifold vacuum, but there are some situations where ported vacuum (that is vacuum from above the throttle blades) is the preferred source. Free In-Store or Curbside Pick Up. Be ready to set ignition timing right off the bat with the engine at 2,500 to 3,500 rpm. Take note of the the comment about keeping your vac advance steady at idle (so make sure that you get full vac advance at a higher MAP pressure . Drive the vehicle down a relatively flat section of road at cruise speed. Wish List. I. Depending on . I have a simulated vacuum advance and a simulated centrifugal advance on my table now. number 724 16 is a vacuum advance unit that will pull 16 degrees of vacuum advance maximum). Draw a strong vacuum on the distributor to assure the vacuum advance mechanism will move and the diaphragm does not leak. WILL FIT MOST GM HEI DISTRIBUTORS. However if your engine has all the smog controls that went along with the ported type of carburetor, then you need to stick to that type. I understand that many people get "noticeable" power gain by tuning the ignition timing on the Jeep 2. For the stock built engine the non ported vacuum advance is the most efficient way to go. Now you are lost in a multitude of choices: North American 009, Kühltek 009, Bosch 010, Bosch 050, Pertronix Billet Distributor, and Magneto. How do I set up a 1600 DP with an aftermarket intake manifold w/heat risers, 205 Distributor with vacuum and mechanical advance. 99. Rebuilding Advice From a Pro. $575. Once understood, the tuner can effectively utilize one source or the other, depending on the tuning requirements of the vehicle. No vacuum advance Assuming a motor's optimum total advance is 36°, its optimum initial advance is 16°, its vacuum advance is limited to 10°, and it idles at 1000 rpm. PerTronix D134630 Flame-Thrower Electronic Distributor Cast Ford FE 332-428 with Ignitor Technology Vacuum . 5 p. advance with vacuum an additional 9°). With the vacuum advance connected at 3,500 rpm, where is your ignition timing? Igniton timing should be checked two ways at 2,500 to 3,500 rpm: vacuum advance connected and disconnected. BUT setting timing THERE can affect the base initial timing. Spark Advance table (distributor rotation) Throttle stop, (choke) Tuning the Idle Control, Tuning the Spark Table: Cruise: Lean (14. 1,001 Posts. What is your idle vacuum? In my "cammed" car I run an initial advance of 13 degrees and a mechanical advance in the distributor of 21 degrees all in at 3000 RPM . The distributor and vacuum advance assembly for the 8/80-8/87 FJ40 and FJ60 have long since been discontinued by Toyota. I have tried them all and nice new GM seems to work the best. The following two articles review the basics of distributor tuning quite well and have worked for years and years and are based on sound engineering principals. SKU # 751317. You double distributor degrees to get crankshaft degrees. The lower the load is the more it will advance the timing. Remove the distributor hold down bolt and hold down clamp. 5L TBI four-cylinder engine. Keep in mind when adjusting the timing, you have to turn the distributor clockwise to advance and counter-clockwise to retard. I tried turning the vacuum advance adjustment with a 3/32" Allen wrench clockwise (first source I read) and went one turn at a time until it . Should I take it higher? Elliot. Some models were set up as vacuum advance distributors. Why would I want more or less vacuum advance and what indicators in how the engine is running would tell me what adjustments should be made. Additionally, for Marcel Chichak’s comprehensive spreadsheet on the advance characteristics of many Lucas distributors, not only those equipped to Jaguars, click here. Datsun Roadster 65 - 67 1/2 1600 Vacuum Advance Unit NISSAN. R. Many people, as you will find on other threads in the forum, simply do 14+14+14 (initial, centrifugal advance, vacuum advance) and leave it at that. Mark Gittelman. The very late model, aftermarket ‘Model 1-1’ Stromberg 97 did have a vacuum port for these distributors but they take vacuum from more than one place in the carburetor. Partnumber: 1382. With our baseline established, we wanted to find the minimum initial timing that was best for our Slant-6. mine all burn 87 octane without ping/detonation,and i run 12~15 degrees intial advance and manifold vacuum to the advance unit. Vacuum advance has absolutely nothing to do with total timing or performance, as when the throttle is opened, manifold vacuum drops essentially to zero, and the vacuum advance drops out entirely; it has no part in the "total timing" equation. The MSD distributors come with 3 bushings with the largest one being 18* so when installed it will give you 18* of mechanical advance. Next, remove the vacuum advance hose from the carburetor and plug it with a rag to check your timing. The amount of vacuum advance can be adjusted by inserting a 3mm Allen wrench into the hose nipple on the vacuum advance canister. However, the ignition distributor no longer has mechanical or vacuum advance mechanisms. centrifugal advance curve starts at 1200 rpm, ends at 2800 rpm (10° per 800 rpm) In order to minimize the likelihood of fuel entering the vacuum advance unit on the distributor, the vacuum ignition take-off point is mounted at the top of the butterfly, and for this reason the butterfly direction of opening is opposite to that of the H type. You can adjust total timing, rev limit, rate of advance, and more with this distributor using a small, fl atblade screwdriver. Roughly set the initial timing so that the engine runs. SKU # 751317. Estimated Ship Date: Today. To Distributor Vacuum Advance Data: Centrifugal Advance: Part No. The centrifugal advance system in a distributor advances spark timing purely as a function of engine rpm (irrespective of engine load or . It seems to run better. In the vacuum line from the 3 way vacuum solenoid valve (1) to the distributor vacuum advance capsule (9) is a vacuum regulator (8) but during the initial 15 minute period this performs no regulating function because the 2 way vacuum solenoid (2) closes off the lower port. See all 15 photos. chris52 said: Cheers Bluebottle. 00. That's ALL that is needed to do. There are two methods we use to check the distributors advance curve, the best method involves the use of a distributor test stand to check and set both the mechanical and vacuum advance curves, and the second choice is the use of a dial-back advance timing light to check the advance curves. Jim Daniels Photographer, Writer. You can check if it is operating correctly by disconnecting the pipe which connects it to the carburettor or inlet manifold and sucking hard on the end, you will hear a click as the base plate moves. If you increased the power and vacuum, adjust again by about 2 degrees. 0 devices. During light loads on the engine, the cylinders . Drive the vehicle down a relatively flat section of road at cruise speed. Some hobbyists have no trouble grasping the concept of vacuum advance and the effects various vacuum sources have on it. Disconnect the vacuum advance from the distributor and plug the line. • If you are going to use a vacuum advance curve, use a 3/16" vacuum line connected to ported vacuum. , knows what goes into as first-class distributor rebuild . UPC: 694342551780. also,these units give a lot of advance. The stock weights and advance plate are perfectly acceptable for all but the highest HP/RPM engines. A higher vacuum inside the inlet manifold changes the vacuum advance unit's reactions. The vacuum advance canister, located on the side of the distributor, provides additional timing only when the engine is pulling vacuum. The 009 distributor is a centrifugal-advance distributor. most are 12 degree units. All in all however for a road engine, the vacuum advance retard should be retained if it is possible to do so (not always easy with sidedraught carbs). This factory HEI distributor reveals the location of the vacuum canister advance arm (A), the mechanical-advance weights (B), . $4. The vacuum advance is designed to help fuel economy by increasing ignition timing as the RPMs increase. It gave detailed info on how to change it but nothing on why. The vacuum advance is preset to 16º. The combination of centrifugal and vacuum advance give the smoothest performance, a 3-4mpg improvement in your fuel economy on the highway, and a major drop in engine temps on the highway too! Because we introduced this distributor, we coined the term "SVDA" in the mid/late 1990s to try to describe it. Nov 1, 2006. $75. Best to check it to see what the max vac adv is. The 4. Note the timing, this is your initial timing. Tuning a carburetor-equipped engine to perform its best with the. Just use care with the little parts as they like to migrate Account for vacuum timing, if necessary. The front small fitting on the side of the baseplate, opposite the throttle linkage, provides a ported (above the butterfly) vacuum source (use this port for the vacuum on a vacuum advance distributor). I am digging into this fine tuning bigtime on my 500" stroked 440 I have. Factory advance curves are often a compromise between performance, drivability and emissions. Fluctuating Needle: A fluctuating needle indicates there’s a problem with a valve or a there’s an engine misfire. Cracked or Broken Ear on Exhaust Manifolds. B. As vacuum increases, it pulls on the arm, which rotates the plate and advances the position of the magnetic pickup to add timing. Remove distributor cap, rotor, and vacuum advance canister. It’s been 40 years so I might not remember the numbers exactly. Estimated Ship Date: Today. I find a new GM performance distributor 1103952 which you can get from Summit Racing, Jegs or probably your local dealership gives you the least amount of issues. before top dead center (BTDC). IG043 123 TUNE BLUETOOTH PROGRAMMABLE ELECTRONIC DISTRIBUTOR . a) Disconnect and plug the vacuum advance hose. It will however improve part throttle drivability so unless your car is a 100% race car I would recommend running a vacuum advance. Keep your eye on the Colortune. initial timing plus the centrifugal advance that the distributor adds as. 99. Remove the original distributor. you can position the distributor to obtain your ideal total timing before selecting a timing curve. The 123 Distributor is a direct replacement for any Lucas distributor. Turn the wrench clockwise to increase the amount of vacuum advance or counter-clockwise to decrease. #4 · Feb 4, 2007. Got the vacuum gauge on and it was reading about 16-17 inches Hg. The last step of a rebuild is choosing appropriate advance springs, tailoring the amount of advance, and testing the distributor on one of our 13 Sun machines. 18 Feb 2013 . The distributor mechanical advance will be ½ that figure. Default Title. l/f-6-161 engines: $ 375. If you increased the power and vacuum, adjust again by about 2 degrees. Vacuum timing is a function of the vacuum advance mechanism and is also tested . The main vacuum advance or top vac-can on the distributor is hooked to ported vacuum. 00 US retail and the recurve spring kits are cheap at about $7. ·. I beliece that one is for a retard. Some have vacuum advance while others may be locked out. Ignition timing, in a spark ignition internal combustion engine, is the process of . Adjustable Vacuum Advance; GM/HEI Distributor w/Vacuum Advance; Comes with detailed instructions. 2. The vacuum advance is entirely independent of the mechanical advance. Account for vacuum timing, if necessary. With ICE systems, the vacuum advance is controlled electronically via a MAP (Manifold Absolute Pressure) sensor built into the ignition control. Compare. 21 Mar 2015 . Just added to your cart. $64. Forgot to mention that one needs to remove the Vacuum line going to the vacuum advance on the distributor or the timing will not set correctly. It is important now to test. vat. 2:1. Distributor - For optimum performance, we recommend changing to the #143-110 vacuum advance distributor. The distributor has no pickup, either. Part Number: D134630. Part Number: MRG-925B. Grasp the distributor and rotate 10 or 15 degrees counter-clockwise to the left. Part Number: MRG-925D. Negative ground only. A 285-degree cam may need the “can” to start applying vacuum at 3 to 5 inches with full vacuum advance in at around 10 to 14 inches. Advance Diaphragm Options specialise in the remanufacture of those hard-to-come-by automotive parts – vacuum advance diaphragms and carburettor parts for older and classic cars, vehicle restoration projects, forklift and machinery engines and generators. Distributor Advance The owners manual recommends timing at 3 deg. It runs a standard Quadrajet (now with a manual choke). Pertronix instructions suggest 5 deg BTDC. Central PA. ) Advance starts: 1-1/4 @ 425 Full Advance: 17-1/2 @ 2000 Vacuum Advance Data Inches of vacuum to Start Plunger movement: 5 Inches of vacuum for full plunger travel: 20 Maximum vacuum advance, Dist. If your motor will idle and doesn't have a big cam in it - and your distributor has no vacuum advance canister - you may want to swap out your distributor with a stock or near stock distributor. Just tune to get the best idle (along with tuning the carb), then limit the advance as appropriate. Increases Horsepower And Throttle Response. Important Note regarding vacuum lines:When timing the vacuum-only distributor, the vacuum line(s) must be attached. Vacuum advance controls driveability at part throttle, but for full throttle operation (and in installations where the vacuum advance is not being used, the centrifugal mechanism in the base of the distributor will keep adding advance at the rate of about 6-8 degrees per 1000 rpm from zero at a low idle speed (about 500 rpm). When the carburetor is changed to one which is missing the proper vacuum port, obviously the vacuum signal is lost, so the centrifugal advance units ARE the proper distributor for this application. Disconnect the vacuum advance and plug the carburetor end. advanceddistributors. Vacuum advance makes the engine more efficient at idle and light part throttle, and that can reduce operating temperature and improve economy. thats in distributor degrees,so it's 24 crank degrees. Keep in mind when adjusting the timing, you have to turn the distributor clockwise to advance and counter-clockwise to retard. $475. You should make sure the total amount of mechanical advance is 36 degrees at high rpm. . If you're cruiser is a gross polluter and cannot pass smog due to a worn vacuum advance assembly, SOR now stocks vacuum advance assemblies; an inexpensive way get your cruiser back on the road. Magnecor - HP plug wire set - 6 cyl E Type Jaguar. And, because the vacuum both causes the need for the advance and supplies advance, the solution is at all times perfectly matched to the problem. Replaces the OEM vacuum advance canister. It is driven by engine vacuum, a small vacuum line runs to the end of the pot from the bottom of the carburetor. Add To Cart. There is no direct relationship between ported vacuum used by the Auto-Lite distributor vacuum advance unit & inlet manifold vacuum, a vacuum . 18 Jan 2009 . The ideal vacuum advance is the maximum possible without excessive pinging. degrees: 11. Back to the 235 , seems like a little extra advance . Jeff Schlemmer of Advanced Distributor (www. Using just the centrifugal makes more controllable power, as the vacuum advance doesn’t kick in when it’s not wanted. Pro Series Pro Billet Distributor is for the racer who needs added spark and precision for their high performance power plant. SET UP FOR VACUUM ADVANCE. distributor is intended to advance the ignition timing above and beyond. . Sale. All the vacuum levels are listed in inches of Mercury (Hg”) as shown on a typical vacuum gauge. So the factories used either dual-vacuum distributors (two vacuum cans that worked against each other) or more commonly, conventional single advance with a temperature-controlled vacuum 'switch' that either disconnected the ported vacuum or switched to manifold vacuum when engine temps rose above a certain point. For this reason we will deal only with mechanical advance. Vacuum can be utilized for tuning purposes. If your car features vacuum timing advance in addition to mechanical timing, and you'll need to loosen the distributor adjustment bolt before you start the engine. For guidance on this determination, see Hammill’s How to Build and Power Tune Distributor-Type Ignition Systems 3. Remove and plug this line. You'll probably find that 8 degrees of initial advance will give you 36 degrees total in a '57 FI distributor. Ok. If you wish to install the 1981-85 RX-7 breakerless distributor in a stock 1974-79 engine, there is one potential problem: the centrifugal and vacuum advance characteristics of this distributor are slightly different from the original equipment "breaker point" style distributors. quick. . Watch a YouTube video showing the stability of the output of the 123 distributor compared to a Lucas dizzy with points and Pertronix. If your mixture is rich that *will* affect hot starting, and should be corrected with the carb mixture screws. Set the adjuster on the vacuum advance unit (if present) to mid-scale. HEI Adjustable Vacuum Advance Fits GM. Regular price. Adjustment of the vacuum advance is made through the port on the front of the vacuum canister. The recommenda-tions for bridge ported and peripheral ported engines (shaded values) are maximum advance settings, usually measured by revving the engine to 6,000 RPM. With the distributor modified to eliminate the vacuum advance schedule, but the total timing remaining the same as with the unmodified distributor we were able to produce . Note:When checking initial and total advance, always disconnect the vacuum advance hose. As with any tuning on a Mini we always recommend using a rolling. vacuum advance disconnected. a lot. 2. PerTronix D134630 Flame-Thrower Electronic Distributor Cast Ford FE 332-428 with Ignitor Technology Vacuum Advance Black Cap. This is a new vacuum advance cannister to fit all Delco distributors used by the IH 4 & 8 -cylinder motors, and the V8 engines including the V-400. It comes off the venturi above the throttle plates and is effectively isolated by the throttle plates from manifold vacuum, more specifically the throttle shaft as the defining point much like an expansion valve in a refrigeration circuit. Part # 66952C. I have an aftermarket Accel distributor in it much like . (Keep in mind this is not a discourse on a tune-up, but how to set the basic timing). This is my newly acquired refurbished Sun 400 Distributor Tester. Including adjustable vacuum advance and mechanical spring kit, to make fine tuning/ setup for varying applications easy. ) mounting plate in the distributor with respect to the distributor shaft. 00 With Free Shipping . For A+ engines only with vacuum advance. (VW 16v head has 2 bolt distributor). Most distributors have both centrifugal and vacuum advances. 16v Distributor Bracket Kit '86-'97 1. Take this The mechanical timing advance is caused by a mechanism inside the distributor. Readjusted idle-mixture screws for maximum vacuum and RPM readings. Watch your vacuum gauge. It will be fitted with its fully rebuilt breaker plate, and points will be installed in most cases for tuning. THE ADVANCE SETUP: Centrifugal and vacuum advance. 28 Jun 2016 . Lightly clamp the bottom section of the distributor shaft in a vise. So I set the pointer at the center line (5), timed it statically (with light hooked up to distributor and points so it flashed when they opened), and dynamically (with white chalk mark at center line ,5, stroboscopic timing light hooked up to #6 cylinder, vacuum advance disconnected, and distributor clamp loosened to turn it); set at 500 RPM . vacuum advance line to the distributor and remove the vacuum gauge and ta- chometer instrumentation. Each additional turn in the clockwise Vacuum Advance for 308 with Electronic Distributor - posted in Engine: I have recently bought a LH Torana with a 308 and found its vacuum advance was disconnected. See details below. 8 Jun 2014 . 10 Jul 2018 . Digging thru all my saved info on tune-up I see that at the BB timing is at 2after TC [for a 235] and for what its worth 1954 261 engines BB is 5 degrees before TC. So with computer controlled timing after tuning we picked up more power all across the board as compared to the stock mechanical/vacuum advance distributor. 312 Truck Y Block Engines. 3. . And the best part is that its really easy to do and costs less than $50 more than their standard distributor. A tuning note on this: If you choose to run straight manifold vacuum to your vacuum advance in order to gain the additional timing advance at idle, you must select a vacuum advance control unit that pulls in all of the advance at a vacuum level 2” below (numerically less than) the manifold vacuum present at idle. So unless you race at half throttle a vacuum advance will have no effect on performance. Now ensure the engine is running at 600 RPM or less (to inhibit centrifugal advance), with the vacuum advance hose removed or preferably plugged. An example of total timing would be 12° initial plus 24° of mechanical which equals to 36° total. SELECT STORE . Beginning with the '68 model year, Ford switched its inline sixes to a dual-advance/retard distributor with both a vacuum and mechanical advance like V-8s of the period. Electrical Firing. The mechanical advance along with the initial advance (base timing set at idle) is what gives you total timing. No vacuum retard. Im running an msd pro billet in my 308 15° intial 33° total no vac advance which I know is basic ballpark for a 308. 9. the distributor to a computer, you can easily adapt the 123\TUNE to fulfill even . Need to change springs and speed up the advance curve slightly. In your MicroSquirt® controller, it is the advance at the lowest rpm bin and a MAP value of 100 kPa. Beetle 1969-1970 * 1500/1600 Manual Trans Distributor: VW 113-905-205T, Bosch 0231 137 035 or 036 Timing Set At:: 0deg TDC Static or @ 800-950rpm w/strobe w/vacuum hose disconnected and plugged Advance/Retard Range: Vacuum (Advance Only): 17-19deg @ 1. 8L-2.

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