Hei distributor without vacuum advance. Distributor comes with an iron gear.

Hei distributor without vacuum advance. Total advance including vacuum advance during high rpm cruise is then 46-50 degrees. Discover symptoms of incorrect adjustments, such as poor fuel efficiency and erratic idling, along with troubleshooting strategies to ensure a In certain instances, there can be a slight vacuum between the carb and the top of the blower and the last thing you want is for the distributor to get a false vacuum signal and advance timing Proform Racing HEI Distributor & Coil for Small Block & Big Block Chevy with Red Cap & Mechanical Advance. . It runs fine and all, but I'm still dialing stuff in. Product Q&A View Now. Initial Timing with vacuum advance connected at full manifold vacuum is damn near 60° BTDCin gear RPMs are 700-800 and the car runs great, but diesels at shut off. Hows that for a disclaimer my previous post was to describe the possibility that without a limiter plate on the vac adv it (the vacuum advance canister assembly) may add more deg advance under certain conditions than what you see at idle I run around 14 initial timing and have my vacuum advance on full manifold and have a MSD limiter plate installed and have it to limit vacuum advance to 12 to 14 degrees for a combined of around 28 to 30 degrees at idle. Should I use the electronic advance module in a standard HEI to eliminate the timing retard ? Rotor phasing can be done by welding the vacuum advance rod so the phasing is good. Centrifugal advance assy. Was talking to a Summit sales guy and he said most guys plug their vacuum Details. So no you still want a total advance of around 34 to 36 degrees. At "part Get the Best Performance with Moroso Durafire Distributor Chevy V8 HEI without Vacuum Advance 72231 parts at JEGS. Once the vacuum advance and distributor are set up correctly, and the carb dialed in, with the new gearing, it should be quite nice to drive. The real gains with vac. When you stand on the loud pedL the vacuum goes away and it is all mechanical advance. Reconnect the hose and take another test drive. Have come across race-type distributors without vacuum advance, but this is a street car. Ignition systems are critical engine components, and one of the pioneer units that helped usher in modern ignition systems is the HEI distributor. The race coil is When the advance is connected to a timed source, it advances when you reach a certain rpm. Advance is in mileage so you can run without it. Distributor comes with an iron gear. If you go higher than this there is a chance of detonation. I assume the computer controls the advance on these cars? This high-performance distributor produces a 50,000 volt spark through 7,500 RPM with true spark alignment for instantaneous response, a high performance curve, a premium cap with On my 49 Jeepster with an 85 231 motor I used the MSD billet distributor without vacuum advance. This is in a Porsche 914 and the HEI is just too dang big for that little engine compartment. oregon chevelle Discussion starter. Vacuum advance’s purpose is to compensate for and engine’s LOAD. This video from the experts at MSD explains the distinction between mechanical & vacuum advance & its role in your ignition system. Without vacuum advance; Uses nylon lockout; Specifications: Part Type. Its simple, easy to tune, and plenty powerful to light off any naturally aspirated engine up to 7000 RPM if properly equipped. The trick is where it comes in. The race coil is designed to put out approximately an additional 3,000 to 5,000 volts at higher RPM. HEI distributors for some reason over advance badly. shaft. If the rotor is not pointed close to the Number One mark, pull the distributor and re-position the rotor until it comes close. Jump to Latest. on the HEI is pretty darned good. HEI replacement distributor/vacuum advance. The timing will retard ABOUT 1 degree per thousand rpm based on the inherent characteristics of the system. If you set the timing you disconnect the vacuum line, set the distributor advance and then when you reconnect the vacuum line the advance takes a significant advance. This comprehensive guide covers the step-by-step process, essential safety tips, and common pitfalls to avoid. With the engine off, remove the distributor cap and use a vacuum hand pump to operate the advance mechanism. "HEI" on my 302 FORD and disable the vacuum advance on the new HEI dist? H. which is where the timing is at an idle without the help of the mechanical weights inside the distributor, and without the vacuum advance hooked-up Hey Betnik- A GM HEI should have bout 20 degrees of advance in it. Before we try to start the engine, be sure the distributor is connected to With the vacuum advance you could set the initial at 10-12 then the vacuum would add another 15 or so for a total of 25 plus whatever mechanical is in the distributor. 56K views 28 replies 9 participants last post by topfuel Feb 7, 2007. DuraFire Distributor, GM HEI, V8, without Vacuum Advance. com FREE DELIVERY possible on eligible purchases When I bought my jeep the vacuum advance didn't have a line hooked up on the HEI distributor. I currently run an HEI with an MSD coil and MSD 6A box and it works great, but I also recently picked up The vacuum advance is shot so I"m looking to replace it with a Hei distributor. 4th, the Base Timing Tables for an EFI engine have the additional vacuum advance timing incorporated into the idle area (initial & vacuum advance), since there's obviously no distributor based advance. I'm told to just disconnect the vacuum advance and set total timing 34 and go up 2° until it pings or backfired at The HEI is a great distributor for a street or street/strip car. Whats the best way to set ignition timing? Exhaust is probably too loud to hear pinging, so thats out. Advance Type. $310. Pull the vacuum line off the vacuum chamber. Either distributor will work without modification. The only way a full vacuum advance would work is if the cannister were pulling from the other side of the dist. When I revved the motor she was poppin and backfiring and making a big fuss. That's nearly 3000 RPM higher than most stock HEI Distributors. On the 50 'Burb, I have a Unilite distributor without vacuum advance. Distributor. Unplug the sensor from the module put a ohm meter on it, use a vacuum pump to move the advance and see if you lose continuity Driving Without HEI Vacuum Advance! The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Log In To remove these My vacuum advance is about a 1/4" longer than the ones Autozone, O'Rielly's, Napa and Pepboys have and I can't find the HEI distributor casting numbers online anywhere so I'm kinda at a loss! I guess the MSD 84281 HEI Vacuum Advance Stop Plate Here's the instructions for that. Vacuum advance is essentially a way to add timing to the engine for part throttle use that is directly related to engine load. . Parts Has anyone else had this problem? I just got my engine assembled, and the vacuum advance on my HEI distributor is making contact with one of the intake risers on my new RPM Air Gap manifold, preventing me from getting the full advance I need from the distributor. I've collected an msd6al box, coil and have a MSD distributor (pro billet from early 2000s, non vacuum advance) from my last car. I run that MSD vacuum advance limiter plate on a regular large cap HEI which would be like the MSD street fire distributor and I run it on the B setting which is around 11 to 14 degrees of vacuum advance. Find a vacuum advance distributor and you will be a lot happier. I was thumbing through a Jegs catalog and they had a HEI GM type distributor for all makes of Engines for$99. Learn how to optimize your engine's performance by adjusting the vacuum advance in your distributor. The timing issue has been present both before and after What I want to know is can I use an aftermarket dist. Why don’t you make a distributor that fits Ford flatheads, 1942-1946 that fits, I ordered one you mfg. The listing for a '71 shows a Prestolite. HOWEVER, what you have is a backyard setup. I've collected an msd6al box, coil and have a MSD distributor (pro billet from early 2000s, non vacuum advance) from I'm scrapping some junk GM V8 cars, and a couple of them have HEI distributors WITHOUT vacuum advance. At that point, the final vacuum advance advance springs in it that allow maximum timing to only come in near red-line rpm, the vacuum advance control unit can be allowed to pull in more advance without the risk of exceeding the 52-degree maximum limit. I have heard of just removing the vacuum advance and timing the engine without Not all distributors are equipped with vacuum advance, but for a street engine it can be very useful. Buy A-Team Performance - Complete HEI Distributor 65K Coil - Compatible with Mopar Chrysler Dodge Plymouth V8 Engines 273 318 340 360 One-Wire Installation Red Cap: Distributors - Amazon. Position the distributor so that the vacuum advance canister is located on the passenger side of the engine pointing roughly forward. Amount of centrifugal advance should be limited to about 20-22 degrees (coming in below 3000 rpm), and amount of vacuum advance should be limited to about 14 degrees. Stock distributors add up to 18-20 degrees, and when you add that to your base and mechanical your total timing is up in the mid 50’s. It all runs at battery voltage and the HEI has dwell control like a gray TFI push start one has, it just tolerates a magnetic pickup and feeds the TFI Total timing was set to 36 without vacuum advance connected. to help promote a more complete burn of leaner mixtures, Always to ported vacuum. Our vacuum lockout plates allow for precise pickup coil position and accurate rotor phasing. A little more idle timing will promote a smoother EFI idle. 0 engines. But under load the vacuum would go away and you would be back to the initial 10 plus the mechanical. Boats run without it because the loads are so high for a given RPM that its pointless. Skip to the beginning of the images gallery. Chevy uses a clockwise distributor. If the engine has an advance curve that That distributor in the picture has a common problem of the wire breaking inside the insulation on the pickup coil, when the vacuum advance moves the wire separates losing connection. and most HEI vacuum advances came from the factory on vehicles with a section of rubber tubing over the pull pin. as most of the major online speed part venders described the bushings as “Advance Limit Bushings”. Manifold vacuum is an excellent Inductive ignitions, like HEI - High Energy Ignitions, aren't as good for high performance My 67 has a 383 with an HEI distributor. Complete Bolt-In Replacements for HEI Chevrolet V8 Engines. Discussion in 'Early CJ5 and CJ6 Tech' started by JOE SKI, Mar 24, 2014 This is the GM Delco points distributor. You can easily set it up with the This additional timing adjustment is made with a "vacuum advance". Use the lightest springs available. If you set your initial advance at 12 degrees for example you would have 32 degrees total. THESE ARE NOT ADVANCE LIMIT BUSHINGS. This inductive ignition technology is typical in most gas-powered classic cars, so you might have to learn about it if doing a restoration project. When the vacuum advance starts working, it turns the point plate or pickup plate on hei I have a chance to pick up this MSD Pro Billet 85551 distributor, still new in the box for a decent price but it has no vacuum advance. WARNING: You need to find a ported vacuum source for the advance. Once you set the total advance, tighten the distributor hold down. Insert a 3/32" allen wrench into the chamber nipple and turn the adjustment screw counterclockwise two turns. Race engines that don't worry about wide RPM ranges and off-idle performance often run without vacuum advance. It advances the timing only during high engine vacuum. and come back for final idle testing after your max total and cruise timing are determined -or- run without vacuum advance for a limited time until it is properly tuned. Reduce the vacuum advance further if necessary to eliminate surging or pinging. y designed module and coil combination which operates without misfire beyond 7500 RPM Vacuum advance is there mostly to get better gas mileage at cruise. The diaphragm moves a rod that turns a sliding plate at the base of the distributor, which can be seen with the naked eye. This is the way that my particular HEI works and it will apply to most but not all HEI distributors. The stock weights and advance plate are perfectly acceptable for all but I currently run an HEI with an MSD coil and MSD 6A box and it works great, but I also recently picked up an MSD Digital 6 box which I plan to use. These bushings are installed into the holes within the advance weights. When I bought my jeep the vacuum advance didn't have a line hooked up on the HEI distributor. Hi all, My 67 has a 383 with an HEI distributor. I always used an Msd box(6T More advance will make it start easier. Manifold vacuum has the vacuum advance advanced at all times and usually way too far advanced. Here’s all you need to know about this ignition technology. I am planning on replacing the cap and rotor and the vacuum advance can is out in order to reduce the pin travel slot as VA currently creates 23 degrees of advance (targeting 12-15 degrees) HEI Distributor manufacturer is unknown but I did just replace the Cap and Rotor with MSD units. The second way to test the vacuum advance does not require a pickup timing light. Operates without misfires up to a minimum or 7500 RPM nearly 3000 RPM higher than an original HEI; and the performance capabilities of the 010 and 050 distributor and designed them into our Flame-Thrower mechanical advance distributor I’ve been seeing a lot of discussion and questions regarding distributor vacuum advance so the non-HEI and HEI vacuum advance control units CANNOT be interchanged). 99. Don’t fear the lack of vacuum on this piece. If the engine has an advance curve that allows a full 36-degree mechanical advance at cruise rpm, the vacuum advance improve power, throttle response, and economy!!! this is the most misunderstood item on oldschool carbureted engine tuning. Sep 6, 2011 #5 acquiring that much time on it without an incidents. The vacuum advance, for example, "provides 10° of advance" at the distributor, but that'll be 20 degrees at the The Cross-Fire DUI Street/Strip Chevrolet DUI distributor (right, shown without vacuum advance) allows the wires to be routed neatly on each cylinder bank. but I think you'll prefer a car with vacuum unless its a strip car. It gives you more advance at a cruise rpm for better fuel mileage. Designed to fit Ford 289-302 5. vacuum advance is a wonderful thing for MPG and throttle response if set up right. Link to progression Ignition webpa HEI DISTRIBUTOR, WITH OUT VACUUM ADVANCE. Use springs that get the total in by Even before emissions/EGR regulations, OEM engines used ported vacuum advance. Additional Information Vacuum Advance & Lockout These vacuum canisters help optimize igniti HEI DISTRIBUTORS. I too 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 its rate – or In engines with an HEI distributor, variable ignition timing is controlled by engine vacuum advance and centrifugal advance. Not compatible with factory roller camshafts without gear change using the recommendation of the cam manufacturer. It has a built-in coil with a magnetic trigger and features a black distributor cap. Wondering if folks know of/have an electronic distributor that is not HEI, but with vacuum advance. 99! Get a progression ignition Bluetooth to your phone and change the timing to whatever you want without popping the good with The Cross-Fire DUI Street/Strip Chevrolet DUI distributor (right, shown without vacuum advance) allows the wires to be routed neatly on each cylinder bank. Details. Product Line. O. Race-only vehicles run fine with no vacuum advance. cruise rpm, the vacuum advance unit can only be allowed to pull in 16 more degrees of advance. the old 97s have no venturi vacuum, the only vacuum port that i am aware of is on the manifold between the first and center carbbecause it is compeltely below the carbs it seems that this isnt a ported vacuum but rather a constant vacuum and would in fact have to be a constant vacuum and would advance the distributor at idle. the vac should rise as you advance the throttle, 26 to 28 hg was the best This HEI distributor is a street/strip version. Joined Dec 8, 2005 Messages 10,083. Use a dial back timing light-if you don't have one-buy one or get degree tape on your balancer. HT32BSX115 Supreme Mariner. running no vacuum advance. You want about 12 (crankshaft) degrees total vacuum advance if you run WITHOUT a functional EGR system, 16 degrees if you run WITH a functional EGR For a street driven car you want vacuum advance. “Manifold” vacuum allows actual manifold vacuum to the distributor at all times. Skip to the end of the images gallery. Are you using “ported” or “manifold” vacuum to the distributor? “Ported” vacuum allows little or no vacuum to the distributor at idle. It's not great. And usually the centrifugal advance is very slow if you have not changed the advance springs. In stock. With adv Two additional things to be aware of with HEI distributors and ignition timing: 1. an GM HEI module and a TFI square coil. That's nearly 3000 RPM higher than most stock HEI distributors. With adv Buy Pertronix D1060 Flame-Thrower Stock Look HEI Distributor Chevy SB/BB with adjustable vacuum advance canister high -Thrower Street/Strip distributors have a specially designed HEI distributor module and coil combination which operates without misfire beyond 7500 RPM. Part Number: 778-66941RM. Set max centrifugal advance at 34-36, then setting at idle will be 12-16 degrees. So, set timing at stock spec. Now there's no need to build your own high-output distributor that you can tune for non-computerized HEI Chevy V8's. This is a clever device that ties manifold pressure to a mechanical advance mechanism. Then set the total advance WITHOUT the vacuum advance. MSD 8428 HEI Advance Curve Kit NOTE: There seems to be some confusion about the bushings that come with these kits. No mater how PerTronix Performance Products Flame-Thrower HEI Street/Strip Distributor Flame-Thrower Street/Strip distributors have a specially designed module and coil combination which operates without misfire beyond 7500 RPM. If the HEI canister is connected to straight manifold vacuum, you will have total vacuum advance along with the initial at idle, but it sounds like you have it connected to ported vacuum. Once it starts, let it warm up and then go from there. For fine-tuning your vacuum advance and optimum performance. Had to buy a timing cover, headers and used a 600 cfm Holly 4160 cab I had. As stated above, ported vacuum advance was done to help build combustion chamber temps Ported vacuum advance lowers peak combustion temperatures at idle to reduce the NOx emissions, and has no difference in operation, compared to manifold vacuum implementation, in off idle driving. What brand of HEI do you have? Most vac advance diaphragms have a set screw that can be adjusted internally. Turning the distributor CCW will advance the timing. My engine runs way smoother with full manifold vacuum on my vacuum advanced on my HEI distributor. Shop Now at the Guaranteed Lowest Price! Hello everyone, I have a HEI distributor with the vacuum advance, 454 motor, and a 750holley carb. from Speedway had to return it, and pay return shipping because it does not fit with the original belts Highlights These vacuum canisters help optimize ignition advance for maximum part throttle performance and cruise speed efficiency. Click image to zoom. Proform High-Performance HEI Distributors & Accessories. I figure either A) Highest idle vacuum B) same as factory setting C) until hard hot start drag kicks in 454 runs better without Vacuum advance. Where you usually have to have initial timing lower than optimum. I don't recall the reason but wasn't familiar with this approach. Thanks. Vacuum is usually consistent in vehicles that have THE ADVANCE SETUP: Centrifugal and vacuum advance. Experts agree that good HEI ignition systems rely on a good module and a good coil. Grab an inexpensive vacuum gauge, if you don't already have one, connect it to your vac line at the dist. it helps me to have more mechanical advance come in without my engine builder was recommending running without vacuum advance on my distributor. Race HEI Distributors feature an electronic HEI Distributor module and 50,000 volt coil combination that optimizes spark energy and peak current to the spark plug in the 6000 to 8500 RPM range. 142 posts · Joined The stock HEI also uses a vacuum advance canister to further advance engine timing. but, shouldn't be too bad. I've never ran without a This high-performance distributor produces a 50,000 volt spark through 7,500 RPM with true spark alignment for instantaneous response, a high performance curve, a premium The distributor instructions are given in distributor degrees. These distributors have factory installed performance advance curve and feature of vacuum advance must be reduced. Part # 72231. Start the car ,warm it up-check your timing at idle. NEW MSD STREET FIRE GΜ HEI DISTRIBUTOR,RED,VACUUM ADVANCE STOP It came with HEI ignition and an RPM air gap manifold. You can use a electronic advance dist without the 4 wire connected as there is a internal advance program in the ignition module. Have buddy operate your throttle HEI Adjustable Vacuum Advance Fits GM Style HEI Distributors, including Ford, AMC, and Chrysler Models. I took an extra vacuum line I had and hooked it up. the vacuum advance control unit can be allowed to pull in more advance without the risk of exceeding the 52-degree maximum limit. Setting Instructions: Counter-clockwise rotation reduces the vacuum, and do not turn more than 5 full turns because the screw can fall out.