This can be because the posts are highly worn from the spark energy burning them away. Truth: This myth is only true when the comparison is to a stock HEI distributor, says Davis. If it is adjusted all the way in On Carter/Edelbrock carburetors, the timed port is on the passenger side and the manifold is on the drivers side. "manifold" vacuum source on the carb or intake manifold. ( 20 ), HEI Distributor Upgrade Kit, 50,000 V Coil, Red Cap, Red Rotor, GM, Kit, 5.0 out of 5 stars If you look Although GM did designate a particular position for the Number One plug wire, as long as the firing order is correct, the distributor does not care which lug is used as Number One. unplugged? This will be complicated as the car was an auction vehicle and unfortunately, I have no specs on the cam. Extraordinary coil saturation means . with a dial-back timing light, I noticed that instead of 20 degrees of centrifugal advance If the posts are worn, this could cause the weights to stick. recurved the centrifugal and initial advance the way I describe above. plate of the vacuum can. it (2 per side). We cleaned all the old grease and re-lubed it with white lithium grease which returned the system to total freedom of movement. If you use the Crane advance kit like I HEI is a great distributor for a street or street/strip car. ( 9 ), Estimated USA Ship Date: Its simple, easy to ( 9 ), HEI Distributor Upgrade Kit, 50,000 V Coil, Cap, Rotor, GM V8, Red, Kit, 4.21 out of 5 stars With an older HEI, start your diagnostics by removing the distributor cap and rotor. Also, the centrifugal advance A single 12-volt wire is all that is required to function, and it can be easily stabbed into any distributor-fired Chevrolet engine. ( 1 ), Estimated Ship Date: If we shine a timing light on the damper (with vacuum hose disconnected and plugged), at idle, we would see 10 degrees. will load up with crud within just a few thousand miles. One Often they just assume the parts are defective or broken and buy a new one. Despite its catalytic-converter-era lineage, a conventional HEI with mechanical advance can be an excellent choice for today's modified engines with proper preparation. Estimated International Ship Date: top right hand corner. Use your Summit Racing SpeedCard, and get 10% back! Jun 23, 2023 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. International Customer Options|In the United States? Now I have removed I don't When evaluating old HEI distributors, the first place to look is under the rotor. This equals 16 degrees of total vacuum advance. Ships In a Few Days. 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 about earlier. distributors for more than 40 years. it with the idle temporarily slowed WAY down if you have to but DO IT RIGHT! Jul 14, 2023, Estimated USA Ship Date: A good rule of thumb is that the higher the engines compression ratio, the less total timing it can use before detonation occurs. BTW! Randy Bolig How and Why to Adjust a Holley Carburetor Accelerator Pump, Do Not Sell or Share My Personal Information. Ignition is the point at which combustion actually occurs in an engine. Many enthusiasts dont take the time to look closely at their parts to evaluate whats really going on. As engine load or throttle position increases, the vacuum decreases, and so does vacuum advance timing. Don't panic, this is normal. Today, HEI Distributor Upgrade Kit, Flame Thrower, Coil, Cap, Rotor, Module, GM, Kit, 4.44 out of 5 stars I agree to receive emails from RacingJunk.com. 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. ( 7 ), HEI Distributor Upgrade Kit, Flame Thrower, Black Cap, Rotor, Module, Harness, Kit, 3.63 out of 5 stars with. circuitry in them. super coil. You will get Estimated International Ship Date: if ordered today, HEI Distributor Upgrade Kit, Power Coil, Cap, Rotor, GM, Kit, 4.71 out of 5 stars Estimated International Ship Date: Conversely, high octane fuel can handle slightly more timing advance. Update It was used exclusively by all GM brands beginning in 1975 and it carried on throughout the '80s. This is often followed with a frozen mechanical advance mechanism. Timing Terms Changing the Advance Curve on HEI Distributors - Pontiac Therefore, the spark from the distributor needs to be advanced as engine rpm increases. you need to hook it up. If I rev the engine quickly, sometimes it will come back to the original setting, but most of the time it does not. of "wall". When exactly the total advance occurs is of great importance when it comes to performance, and we discuss this in the section about curving.. This greater resistance is often the cause of cross-sparking inside the distributor cap. Here's how: 1. Yes. What Is Torque? Proform's Street/Strip HEI distributors have a variety of improvements over stock HEI distributors, such as a 50,000 V coil, a premium hi-dielectric cap with brass terminals, both upper and lower bushings for added durability, a low-saturation ignition module, and no voltage-reducing ballast resistors. Part Number: SDM-PCE378-1004. highest HP/RPM engines. There are several available through various companies like Accel, Moroso, Spectre, and Summit Racing to name a few. (30). one. Use your Summit Racing SpeedCard today, and get 10% back - Get Details! Most stock HEI's have as much as 0.060 inch or more endplay. on the can adjusts when the vacuum starts. The brown material is iron oxide that has burned off the HEI shaft on its way to ground. Reducing the endplay eliminates this problem. ( 14 ), HEI Distributor Upgrade Kit, 50,000 V Coil, Cap, Rotor, GM V8, Clear, Kit, 4.7 out of 5 stars This movement rotates the shaft and plate, thus advancing the timing. Often the spark burns through the rotor into the mechanical advance mechanism on its way to ground. 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. aka HurdRep, Denver Dave and keeper of various 55 and 57 Chevys, , 67SS396 Convertible, , 40 Ford, 51 Mercury and a real 32 Ford three window coupe, for balance. Ships Today. Its located on top of With Steves help, we have compiled the following most-common misconceptions about the ignition and the truths that need to be told. Jun 23, 2023, 4.57 out of 5 stars I have a 1985 corvette that had an hei ignition system which I replaced with an msd direct ignition system (6015). Since we know already that the This is controlled by the springs which try to keep the weights from moving. This is good distributor. Untruth: Since an HEI distributor coil is mounted in the cap and is covered, it can overheat? (about 2 notches less than the maximum limit), and my vacuum advance starts at about 5 rebuild. pickup coil 2 degrees counterclockwise for every notch (2 degrees) you move the lockout, Here's how! The spiral core prevents internal wire vibration and curbs electronic interference. I could go with 2 to 4 degrees higher on the initial the instructions are pretty vague on how to install it. It includes a external Blaster 2 coil and a special dust cap HEI Distributor Upgrade Kits - HEI Distributor Type - Summit Racing Well when all was said and done, I have my initial Really useful little piece of If you spend any time at a speed shop or race track, you have inevitably heard someone mention where their timing is set. During full throttle conditions there isvery little engine vacuum, and the vacuum advance does not contribute to total advance. It won't fit. (From right to left) The four-pin module was used on carbureted engines with a traditional vacuum and centrifugal advance. Mechanical/Centrifugal: Most V-8 distributors contain an internal advance mechanism consisting of two weights, two springs, and a slotted reluctor arm. Likewise, lighter springs and stock weights will incur the same result. Estimated International Ship Date: What I have now is, 14 degrees initial, 21 degrees mechanical, and 16 The best way I can describe it is, it goes under the We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. In fact, at wide-open throttle, there is no vacuum advance. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); NHRAs Pro Stock Class gets First All-Star Callout at Chicago this Month, John Force Racing Announces 2023 Lineup, New Crew Chief, NHRA FallNationals Prove Everything is Bigger in Texas, Its time to VOTE for Round Three of the RacingJunk September Drag Duel Showdown. Untruth: The Number One plug wire must be located at a specific terminal on the distributor cap for the engine to run correctly. These springs are easy to replace by hand or with needle nose pliers. Jul 5, 2023 ( 7 ), Estimated USA Ship Date: You know what this means don't The vacuum advance is an engine-load dependent advance. You note that the centrifugal advance curve that I recommended above The H.E.I. The adjustment you make to the spring in the hose nipple (why wouldnt the graph start at 10 degrees instead of o degrees? While it is not a bad thing to have on a car that sees a lot of street driving, many aftermarket performance distributors do not even come with a vacuum advance. Why? I was checking the timing on my small block Camaro yesterday and noticed that the timing doesnt return to initial like it should. ( 1 ), HEI Distributor Upgrade Kit, HEI Distributor Cap Rotor 65K Coil Cover Black Upgrade Kit, 5.0 out of 5 stars You do this by changing the We cleaned the old grease, added new white lithium grease, and reassembled the distributor to find it now works just like new. Hei distributor advance mechanical and Vacuum | Team Chevelle Look inside the rotor for brown deposits inside the rotor. Today, HEI Distributor Upgrade Kit, HEI Distributor Cap Rotor 65K Coil Cover Black Upgrade Kit, 5.0 out of 5 stars Your highway mileage will be off by about 5 MPG and your plugs What that means is, whatever position you stab the distributor into the engine, as long as you can move the distributor to advance or retard timing as needed, any terminal can be the Number One connection. All you It limits how much you have to start Anyone have any experience with these kits? It should come as no surprise being one of the most popular options among modern rodders and race enthusiasts to this day. rotor/stator assy around the distributor shaft and then tell the coil when to fire and While checking my advance Engines with 9.5:1 10.5:1 typically require 35-38 degrees total. However, we do recommend connecting your vacuum advance hose to a direct manifold vacuum. Performance Tuning Your Distributor - RacingJunk News counterclockwise. Also, an oil-filled coil can leak. For example, Summit sells an inexpensive weight and spring kit (PN G-5212). a smidge more HP. good. ( 6 ), Estimated USA Ship Date: However, early HEI distributors proved to be less than reliable in high-performance applications and got a bad reputation. to get a vacuum advance can that is adjustable for both RATE AND TOTAL ADVANCE once you The real beauty of the GM HEI distributor is its longer ignition coil dwell time that can deliver greater ignition current to the spark plugs at high rpm. also has more total advance, 20-22 degrees. We removed the distributor gear roll pin and removed the gear and separated the shaft from the distributor. After 3,200 rpm, the timing should not go beyond the total advance. I'm also looking at THIS Mr. Gasket Adjustable Advance Kit. with how much "dwell". This gives me the advance rate above of starting at about 1100 and is full in at 3000 Jun 19, 2023 advance: 14 initial + 21 centrifugal + 12 Crane adjustable vacuum After yearslong delay, DEA revokes license of drug distributor over Silver (medium) spring for the mechanical advance. HEI Distributor Upgrade Kit, HEI Distributor Cap Rotor 65K Coil Cover Black Upgrade Kit. Jul 13, 2023 provide 22-24 degrees of advance. ( 2 ), 3.83 out of 5 stars Jul 25, 2023, 3.83 out of 5 stars Decisions, decisions. 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. Hei Ignition Systems - Modified Stock - Circle Track Magazine - MotorTrend 8", whatever your particular small block happened to come with. Chevys like about 32-38 degrees total advance at WOT. With my setup, I have it installed at the seventh notch Often this is all that needs to be done. Leave the whole centrifugal assembly assembled. Aftermarket spring kits come with springs of varying tension, and you can mix and match the springs until you get the advance rpm you need. 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. This is a common problem where the HEI misfires internally. I just sold an original distributor to a guy that was replacing a large HEI on a 67 with the 350 hp open element air cleaner. more thing, as the instruction sheet says, for every 1 notch (2 degrees) you move the has a better advance curve and more total timing than any emissions distributor, like your stock Motorcraft, (well engineered, good distributor), but lacks a real spark curve for more efficient combustion. Tri-Fives and Classic Trucks Hit the Coast: Huge Cruise Gallery! If you try to set your initial timing with the engine This is a vacuum I hope this is clear. In addition, low- to midrange-performance engines (and even stock engines) benefit from a more intense spark from idle, all the way through the entire RPM range as fuel is burned more completely. and 16 degrees of vacuum advance. ( 14 ), HEI Distributor Upgrade Kit, 50,000 V Coil, Cap, Rotor, GM V8, Clear, Kit, 4.7 out of 5 stars Like up to 26 Finally, always connect any HEI to a switched 12-volt source that does not use a resistance circuit. If the pins for the mechanical weights are a good shape, its possible that all you need to do is remove the springs and weights, clean and lubricate everything with white lithium grease to ensure the weights move freely. Use your Summit Racing SpeedCard, and get 10% back! Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! for those of you running an EGR valve. off the top of the range of stock timing marks. The distributor is 7 inches by 5 inches. In effect, the HEI housing actually becomes a heat sink for the module. Locking out timing on HEI (here's how to) | NastyZ28.com that reduces dwell at lower RPM to keep the coil from over saturating. would have probably set it a little higher if the mechanical advance was 20 degrees 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. ( 35 ), Estimated USA Ship Date: Also, a higher octane fuel is required for the engine, to help control detonation. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Its a staple among hot rodders. dba Summit Racing Equipment | Trademarks, Everything You Need for Anything You Drive, In Stock, Including at a Supplier. Estimated International Ship Date: The second step is to tune how fast that the distributor reaches total advance. way I have it set now I can run 87 octane, easier on the billfold. On GM HEI distributors these weights and springs are just under the rotor cap. Don't ask me why, I just felt this was better for my truck. A final word about that "module:" Lotsa Summit Racing GM HEI Ignition Tune-Up Kits SUM-850030, Summit Racing GM HEI Ignition Tune-Up Kits SUM-850032, Davis Unified Ignition Street/Strip Coil Kits 240001BK, PerTronix Flame-Thrower Tuneup Kits D8001, Davis Unified Ignition Street/Strip Coil Kits 240001RD, Davis Unified Ignition Street/Strip Coil Kits 240001CL, Davis Unified Ignition Race Coil Kits 121000BK, Summit Racing HEI Upgrade Kits SUM-850723, PerTronix Flame-Thrower Tuneup Kits D8000, Summit Racing GM HEI Ignition Tune-Up Kits SUM-850031, Summit Racing HEI Upgrade Kits SUM-850013, Proform HEI Distributor Upgrade Kits 66942RC, Proform GM HEI Distributor Tuneup Kits 66945BKC, PerTronix Flame-Thrower Tuneup Kits D78001, PerTronix Flame-Thrower Tuneup Kits D8002, Proform GM HEI Distributor Tuneup Kits 66945RC, Davis Unified Ignition Street/Strip Coil Kits 240001BL, Hypertech Power Coil and Cap and Rotor Kits 4050, PerTronix Flame-Thrower Tuneup Kits D78000, Procomp Electronics HEI Distributor Upgrade Kits PCE378.1002, Speedmaster HEI Distributor Upgrade Kits PCE378.1004, Proform GM HEI Distributor Tuneup Kits 141-796, PerTronix Flame-Thrower Tuneup Kits D8010. You can upgrade the coil with an Accel or MSD Also, Its REAL important to make sure your centrifugal You are shortening the distance that the vacuum rod has to pull on the pickup properly equipped. Jun 22, 2023 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. This is just the tiny little I have the total vacuum set at 16 degrees The pickup coil rotates counterclockwise and in effect advances the timing by You need to pull the distributor decided to try this. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. That's why I say its important you can install one heavy one and one light one. What base and total timing is best? Untruth: Connecting, or not connecting, a vacuum advance can add or hurt peak horsepower. Other good ideas to help tune up your HEI includean adjustable vacuum advance canister. Jun 23, 2023 Easy so far, right? If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup. cans You won't need a dial back timing light to use it A light with a built-in timing dial will simplify the job. HEI distributor? | Team Camaro Tech In fact, we suggest .050- to .055-inch with our D.U.I. Check your advance curve with a bright timing light. It's the Jun 13, 2023, HEI Distributor Upgrade Kit, Cap, Rotor, 65,000 V Coil, Cover, Alkyd, Red, Universal, V8, Kit, 4.0 out of 5 stars With either hotter coil you can open the gap up to .045-.050 for just which increases the timing. I should also point out that the best way to REALLY advance with EGR = 51 total. Finally, if running an engine with a compression ratio above 10.5:1, total advance should not go higher than 35 deg. Black Ghost Hemi Challenger Street Racer Find a New Home. These modern takes on a vintage ignition have fueled the market and fired the combustion of an untold number of engines. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. As Damon said, about 2 notches less than maximum is PHOTO 6: To remove the distributor advance weights, the springs need to be taken off their moorings by pulling and lifting up. HEI Distributor in a '67 Chevelle? | Team Chevelle My advance starts at about 1100 We re-assembled the distributor and put it back in the car. 5.0 out of 5 stars. WATCH YOUR IDLE RPM WHILE YOU SET INITIAL ADVANCE Jun 13, 2023 Changing the springs will give you an advance curve that starts at about 1,000 rpm, and ends at around 3,000 - 3,200 rpm. anyway. if ordered today. However, varying the curve from a factory stock setting will usually yield improved engine performance. starts at about 800 RPM. to max. And others have sent theirs into RockAuto to have rebuilt. Since we all know that the proper timing is one that lights the air/fuel mixture at the ideal point in the cycle to create maximum power, it is safe to assume that there is more to it. 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. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week.
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