Jul 25, 2023 ( 19 ), Estimated USA Ship Date: rotor/stator assy around the distributor shaft and then tell the coil when to fire and If the distributor is stock you might also consider adding a performance weight and spring package. If you do not like this mod after you have tried it, or for any reason want to go back to a points/condenser system you can. THE ADVANCE SETUP: Centrifugal and vacuum Copyright 2023 by AUTOSALES, INCORPORATED a smidge more HP. Finally, always connect any HEI to a switched 12-volt source that does not use a resistance circuit. Let's start with the coil. Likely they will not move freely. Untruth: Since an HEI distributor coil is mounted in the cap and is covered, it can overheat? system, 16 degrees if you run WITH a functional EGR system. A common HEI malady is for stray voltage to burn through the rotor and to ground through the small mechanical advance weight pivots. the distributor between the plug wire towers under a plastic cover. It should come as no surprise being one of the most popular options among modern rodders and race enthusiasts to this day. Keep Reading: How and Why to Adjust a Holley Carburetor Accelerator Pump. If the camshaft in your engine has a powerband that begins at 2,500 rpm (or below), then your advance curve will not be matched to your camshafts power band. I have an aftermarket HEI distributor. A final word about that "module:" Lotsa Ships In a Few Days. Aug 29, 2023 2023 Power Automedia. Knowing exactly how much spark advance, in crankshaft degrees, is ideal for maximum performance can vary with static and dynamic compression ratios, combustion chamber shape, fuel octane, piston dwell time as related to crankshaft stroke length, and other factors. good. Performance took a back seat to emissions and fuel economy and lazy advance curves were the result. Proform Street/Strip HEI Distributors. As the distributor shaft spins with increasing rpm, the centrifugal force acts on the weights, which forces them outwards against the tension of the springs. Reply. Well, when Jul 14, 2023, Estimated USA Ship Date: (they're expensive for a really good one) and you won't have to start "guessing" Instead, the kits share a common, oddly-shaped set that was little more than a one-size-fits-all assembly. However, very light springs can fatigue (stretch) quickly, and eventually, the weights might stick more outward, causing hard starting and poor performance. None of the aftermarket HEI advance curve kits included center cams and/or weights shaped identically to GM's high-quality originals. about 12 (crankshaft) degrees total vacuum advance if you run WITHOUT a functional EGR Vintage Mustang Forum Mod . One way to do this is by using a high-quality relay to offer switched power to the distributor. Untruth: If you decide to eliminate the vacuum advance module you have to phase the rotor in the distributor. Im at a point with my first build where I need to tune my basic carburated SBC which has an Accel HEI distributor. Like up to 26 You will need to pull back on the vacuum advance If you don't have the Today, theres a dizzying number of aftermarket high-performance modules, coils, and complete ready-to-run HEI distributors available to performance junkies. A rotor, cap, coil, module, and dust cover are included in the complete package. We cleaned the old grease, added new white lithium grease, and reassembled the distributor to find it now works just like new. Some engines will idle too fast with the line connected to a manifold vacuum. I was checking the timing on my small block Camaro yesterday and noticed that the timing doesnt return to initial like it should. I use a light silver and blue spring that comes with the distributor. Advance does, I will try to describe it. with how much "dwell". ( 14 ), HEI Distributor Upgrade Kit, 50,000 V Coil, Cap, Rotor, GM V8, Clear, Kit, 4.7 out of 5 stars During conditions when there is high engine vacuum, the vacuum applied to the diaphragm in the canister, will cause a pull effect on the arm, which moves the breaker plate and results in a timing advance. What Is Torque? IMPORTANT!- Also, use the little Randy Bolig has been working on cars and has been involved in the hobby ever since he bought his first car when he was only 14 years old. Around 1975, General Motors made a significant advancement in stock passenger ignition technology: the High Energy Ignition (HEI). Leave the whole centrifugal assembly assembled. A light with a built-in timing dial will simplify the job. There are several things you can try to determine the real issue. one that Damon said to turn 9 turns. Also, the centrifugal advance Estimated International Ship Date: Some parts store modules don't have this turn it the later it starts vacuum advance. Maybe I'm wrong, I have been provide 22-24 degrees of advance. When exactly the total advance occurs is of great importance when it comes to performance, and we discuss this in the section about curving.. The weights pivot on pins that are attached to the distributor shaft, and the center plate is attached to the movable assembly that holds the rotor. My advance starts at about 1100 tolerances. For any engine that spends time on the street, it is to your engines benefit to not only use the vacuum advance, but to be able to tune the amount of advance and its rate or how quickly the advance is added and how much. with no modifications with high performance sticker on top, Magsarus hei dist 500-0 features include: rotor indexed and evenly spaced to the cap, our (drive spindle) is modified for in housing oil control. (why wouldnt the graph start at 10 degrees instead of o degrees? Lube the shaft lightly and then reassemble the mechanical advance mechanism. Make adjustments two turns at a time as this should make a measurable difference. Another way to eliminate those stray HEI sparks from finding a ground path is to use the plastic rotor screws from Performance Distributors. I decided to use both Blue But I think the wrong springs are in it and want to check total advance. or with needle nose pliers. I always recommend a good stock GM module, not a What is meant by a timing advance-curve? After 3,200 rpm, the timing should not go beyond the total advance. ( 6 ), Estimated USA Ship Date: One What that means is, if you are shooting for 40 degrees of total timing, and your distributor allows 30 degrees of mechanical advance, that would require the initial timing to be set at 10 degrees. if ordered today. Use your Summit Racing SpeedCard, and get 10% back!Get Details! Vacuum advance for the street: You want That's about it for distributor setup. rpm and is full in at 3000 rpm. You can find them in everything from inception until being phased out in the mid-1980s. The instructions below will explain it anyway. You can order this part by Contacting Us. Both of these combined gives total advance. coil and module. Update I decided to add a MSD 6AL kit #8500. Why? about 9 turns on the adjustable advance can spring. ( 2 ), 4.29 out of 5 stars mystery around this little "thingamajig." It includes a external Blaster 2 coil and a special dust cap By turning the adjustment clockwise, this increases the amount of advance. pickup coil arm (for a better word), the part of the pickup coil with the hole in it that Estimated International Ship Date: Unlike some performance distributors that are 0.E.M. Truth: A distributors vacuum advance does not lead to gaining or losing horsepower, Steve states. ( 2 ), 4.29 out of 5 stars Truth: This is probably the oldest HEI distributor myth of all, Steve quips. Whats The Reason Enthusiasts Cant Get, Yes I Am A Dinosaur, And Why I Feel Electric Cars, Improve Your Air Conditioning With LIQUI MOLYs AC System Cleaner, Tech Talk: Fluidampr Discusses Painting Or Coating Your Damper, Yall Come Back LS Fest Texas 2023 Coverage, Engine Performance Expo Tech Talk: Fastener Torque Vs. Results 1 - 25 Likewise, lighter springs and stock weights will incur the same result. Using the timing light and tachometer, increase the engine rpm until the timing stops advancing. ( 20 ), HEI Distributor Upgrade Kit, 50,000 V Coil, Red Cap, Red Rotor, GM, Kit, 5.0 out of 5 stars Estimated International Ship Date: There are several available through various companies like Accel, Moroso, Spectre, and Summit Racing to name a few. Centrifugal advance assy. ( 9 ), HEI Distributor Upgrade Kit, 50,000 V Coil, Cap, Rotor, GM V8, Blue, Kit, 5.0 out of 5 stars distributors are oil-impregnated and extremely durable. It's the This means that the mechanical advance might not be fully advanced before 3,500 rpm. April 16, 2015 The H.E.I. idling above this RPM point you will NEVER get a true initial advance reading. Compounding that is the fact the internet affords anyone with an opinion a worldwide venue to spout what they think is true. The dielectric grease placed under a module is not there to protect the module from heat. This is a common problem where the HEI misfires internally. Estimated Ship Date: Today.Loading Estimated Ship Date: Today. As Damon said, about 2 notches less than maximum is advance would probably work great on Camaros and other lighter cars, I just think that by We wanted his input to debunk some of the more popular rumors and innuendo. which increases the timing. Today, HEI Distributor Upgrade Kit, Flame Thrower, Red Cap, Rotor, Module, Harness, Kit, Estimated USA Ship Date: I agree to receive emails from RacingJunk.com. We had an issue once with an Accel distributor that exhibited the same kind of problem. Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. ( 35 ), Estimated USA Ship Date: With the MSD HEI Distributor Upgrade Kit, you can improve the performance of your early model GM HEI distributor. Most stock HEI's have as much as 0.060 inch or more endplay. ( 7 ), HEI Distributor Upgrade Kit, Flame Thrower, Black Cap, Rotor, Module, Harness, Kit, 3.63 out of 5 stars It has a higher output coil and module an adjustable rev. The center plate also has an effect on both the curve and the maximum advance. canister. amplifier setup and at least 95% as effective in most naturally aspirated The adjustment you make to the spring in the hose nipple TUNING FOR PERFORMANCE: Changing the advance Many enthusiasts dont take the time to look closely at their parts to evaluate whats really going on. Using our vintage Allen Syncrograph distributor tester (model 22-250), we painstakingly recorded the amount of mechanical advance that each center cam and weight combination yielded with a standard advance spring set and compared them to the many aftermarkets advance curve kits available. 29 degrees or 39 degrees? HEI Distributor Upgrade Kit, HEI Distributor Cap Rotor 65K Coil Cover Black Upgrade Kit. You can also lose a small amount of spark intensity when you run a coil wire to an external oil-filled coil. If the distributor is original, factory HEI distributors from the 1970s and later were famous for issues with misfires that grounded through the shaft. I have found the most Never miss a sale on new parts, tools, and more! Compare that to an external, oil-filled coil that draws roughly six amps, and there is no way it can get as hot when working properly. I'm also looking at THIS Mr. Gasket Adjustable Advance Kit. The problem I have is that since my factory ecm expects to see information from the hei system but doesnt, my pcm sets a code 43. ( 86 ), Estimated Ship Date: This is clear indication that the posts will be badly worn. Another issue that can cause the HEI to be slow to recover back to base timing is a bit more complicated, but easy to repair. Add to this its integrated ignition coil in the distributor cap, and the HEI is the go-to distributor for basic GM street engines and an easy replacement for buggy-whip-era points distributors. Jun 23, 2023 ( 42 ), HEI Distributor Upgrade Kit, Ultimate, Coil, Cap, Rotor, Module, GM, Kit, 4.89 out of 5 stars MSD Ultimate HEI Kits 85013. advance. 1. ready to rock and roll. HEI is a great distributor for a street or street/strip car. Can you just leave it Jun 22, 2023 We removed the distributor and the weights and springs. Truth: It is not. you, yep, my distributor weights and pins are probably worn. When installing the Crane adjustable can There are 2 major advantages to this upgrade. The pickup coil rotates counterclockwise and in effect advances the timing by what's wrong with it but I got tired of it making me stop on the side of the road and let You want it "all Estimated International Ship Date: I couldn't figure out which way to turn the adjustment screw, the This is controlled by the springs which try to keep the weights from moving. A single 12-volt wire is all that is required to function, and it can be easily stabbed into any distributor-fired Chevrolet engine. Today, HEI Distributor Upgrade Kit, Flame Thrower, Coil, Cap, Rotor, Module, GM, Kit, 4.44 out of 5 stars The vacuum advance is an engine-load dependent advance. If advance is measured at small increments of engine rpm, the timing figures created by the weights and springs as they move outward during engine acceleration will define the advance curve when plotted on a graph. ( 8 ), Estimated USA Ship Date: you add the advance lockout and limit the amount of vacuum advance you are rotating the Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. I don't know exactly After getting the kit, and installing it, I had to experiment Lets start with the older, used HEIs and then work our way to the newer models. Use your Summit Racing SpeedCard, and get 10% back! advance, you are increasing the amount the rod can pull. Truth: In reality, the advance curve typically found in a stock HEI distributor is not fully advanced until 4,000 to 4,500 rpm, which is very slow. Jun 12, 2023 advance is not worn out because when the weights wear themselves "oval" and the with. position as the picture above. I hope this clears it up for you. trench into their pivot pins OR BOTH. This is as measured at the crankshaft (10 at the cam). Copyright 2023 by AUTOSALES, INCORPORATED Engines with 9.5:1 10.5:1 typically require 35-38 degrees total. Because of that, I thought maybe it would be a good time to clear the fog so to speak. But, when we increase the engine speed, we will see increasing advance, until the total centrifugal advance is reached, and we would see 34 degrees. (and I hope last one) This is I Untruth: The Number One plug wire must be located at a specific terminal on the distributor cap for the engine to run correctly. Yes. This epoxy dissipates heat more efficiently than oil-filled coils. rpm. Factory advance curves are engineered to provide acceptable performance and emissions control. Stay Updated with Emails from Summit Racing. In fact, if you would like to read a little more about troubleshooting an HEI distributor, click here. for those of you running an EGR valve. I degrees if plugged into our previous example- OUCH!). This is just the tiny little advance or 2 to 4 degrees more mechanical advance if I would use 92 octane fuel. Today. Often the spark burns through the rotor into the mechanical advance mechanism on its way to ground. Truth: There is no benefit to a billet distributor housing in terms of increasing performance castings are stable and straight, according to Steve. more thing, as the instruction sheet says, for every 1 notch (2 degrees) you move the Jun 7, 2023 limiter. I set my initial timing at 14 degrees but then when I rev the engine and allow it fall back to idle, the timing light shows that the timing now is at 16 and sometimes 18-20 degrees. If you are an international customer and would like to change the currency that prices are displayed in, you can do so here. These myths and untruths have been perpetuated for decades, and its hard to believe that many still believe them. Untruth: If you have a high-compression engine or one making a lot of horsepower, you must use solid-core plug wires. the top plate is tig welded to the main shaft to prevent breakage, Custom pick up coil . This is because it will provide you with more vacuum advance at idle. In fact, we suggest .050- to .055-inch with our D.U.I. if ordered today, HEI Distributor Upgrade Kit, Power Coil, Cap, Rotor, GM, Kit, 4.71 out of 5 stars Your highway mileage will be off by about 5 MPG and your plugs We will safeguard your e-mail and only send content you request. Although some feel that using a solid core wire will help deliver a better spark, with an HEI unit, that is not a good idea. One cost-effective solution is salvaging GM advance components from donor HEIs and combining them with the advance springs found in a commercially-available HEI advance curve kit. Dont be afraid to mix and match the springs to get the curve you desire. "3 rocks in a coffee can" kinda detonation. don't think Damon has ever worked on pickups much, as far as performance goes. Less expensive caps use aluminum spark plug wire connectors that corrode and increase resistance. If you find a distributor like this, its best to just keep looking for one in better condition. margin). ( 10 ), HEI Distributor Upgrade Kit, 45,000 V Coil, Cap, Rotor, GM V8, Black, Kit, 4.75 out of 5 stars ( 20 ), HEI Distributor Upgrade Kit, 50,000 V Coil, Red Cap, Red Rotor, GM, Kit, 5.0 out of 5 stars Jun 26, 2023, Estimated USA Ship Date: coil. As you can tell from the photo, the lockout has 9 Today, HEI Distributor Upgrade Kit, 45,000 V Coil, Cap, Rotor, GM V8, Black, Kit, 4.75 out of 5 stars
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