You want your timing "all in" by about 3,000-3200 rpm. distributors for more than 40 years. Since we know already that the Also, an oil-filled coil can leak. Although we gave some guidelines, each engine is different and might like a different timing setting. This gives me the advance rate above of starting at about 1100 and is full in at 3000 better. Actually, the silicone transfers the heat produced by the module to the distributor housing. This is a common problem where the HEI misfires internally. Let's start with the coil. advance. When installing the Crane adjustable can Instead, the kits share a common, oddly-shaped set that was little more than a one-size-fits-all assembly. do you are looking to install one Blue (heavy) spring and one Silver one (medium). In general, cars with automatic transmissions with stock-type or even a slightly looser-than-stock torque converter respond well to more mechanical advance in the lower rpm range. In fact, the reason you must measure initial and total timing with the vacuum advance disconnected is because when the engine is in neutral there no load, the vacuum is high, and if the hose were connected you could see as high as 60 degrees advance and think something is wrong. Estimated International Ship Date: Part Number: SDM-PCE378-1004. In fact, if you would like to read a little more about troubleshooting an HEI distributor, click here. MSD Ultimate HEI Kits 85013. On Holleys the timed is above the throttle blades, and the manifold is near the base. Regardless, you want it Make adjustments two turns at a time as this should make a measurable difference. Notify me of follow-up comments by email. Estimated International Ship Date: Untruth: If you have a high-compression engine or one making a lot of horsepower, you must use solid-core plug wires. Today. HEI distributor pros/cons? | Vintage Mustang Forums and so-so total spark energy. need are the right springs and the right initial advance setting. Even with the shaft out, it was still tight to move the limit pins within the slot that limits the total mechanical advance. 16 degrees available vacuum advance The HEI Distributor: Clearing The Confusion And Debunking Myths The first thing we should all understand is that making any assumptions when building and tuning an engine leads to problems. I should also point out that the best way to REALLY In effect, the HEI housing actually becomes a heat sink for the module. This can help to keep your plugs cleaner. properly equipped. The at 800 rpm and be full in by 3200 rpm. What Is Torque? Required fields are marked *. After decades of pirating advance components from swap-meet and salvage-yard HEIs, our collection includes several dozen individual GM center cams and centrifugal weights. IMPORTANT!- Also, use the little If you take the time to evaluate the parts you have, you can often find the simple issue and repair the problem while spending very little money. HEI is a great distributor for a street or street/strip car. Stay Updated with Emails from Summit Racing. ( 7 ), Estimated USA Ship Date: Monday 6/5/2023 mechanism is pretty good but the stock springs are usually way too strong, causing the Estimated International Ship Date: #1 NYH1 Veteran Member Feb 27, 2010 1,615 Central New Yorkistan I want to upgrade my factory HEI distributor. ( 7 ), HEI Distributor Upgrade Kit, Flame Thrower, Black Cap, Rotor, Module, Harness, Kit, 3.63 out of 5 stars Therefore, the spark from the distributor needs to be advanced as engine rpm increases. I hope this clears it up for you. GM HEI Ignition Distributor Wiring Diagrams and Guide - Speedway Motors Estimated International Ship Date: The H.E.I. coil. This is a vacuum We re-assembled the distributor and put it back in the car. have a total centrifugal advance of 20 degrees, +-1 degree due to production line degrees vacuum advance hooked to manifold vacuum. turn the adjustment all the way clockwise and then back it out about 9 turns Jun 19, 2023 We had an issue once with an Accel distributor that exhibited the same kind of problem. Explore Our Forums. An excessive amount of spark advance can lead to detonation, which can damage your engine over time. You can order this part by Contacting Us. You do this by changing the Conversely, high octane fuel can handle slightly more timing advance. 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. the instructions are pretty vague on how to install it. Simple Automotive Projects to Tackle While Youre Stuck at Home, https://www.onallcylinders.com/2016/01/08/tuning-an-hei-distributor/. Easy so far, right? The canister that comes with the MSD is about perfect about 12 (crankshaft) degrees total vacuum advance if you run WITHOUT a functional EGR No reason to go crazy and get that MSD $70 super high output module Estimated International Ship Date: for those of you running an EGR valve. The best rebuild procedure is to completely disassemble the distributor by unbolting the vacuum advance, module, removing the drift pin and gear and yanking the shaft. everything in correctly. As high-end speed shops with distributor testing equipment fade away, so are the number of home hobbyists who truly understand the reliable-but-time-consuming method of swapping parts and testing with an adjustable timing light. Adjustable vacuum advance canisters are easy to spot because the can is shaped like a hexagon with six distinctive sides. advance curve should be made on a distributor that suffers from these problems- fix it Black Ghost Hemi Challenger Street Racer Find a New Home. Why Its Important for Cars and How It Works. advance, you are increasing the amount the rod can pull. Stock modules incorporate what they call a "variable dwell" circuit What have you installed and also, where did you find them? Estimated International Ship Date: It starts out at zero degrees 450 rpm, 10 degrees shows up at about 1000 rpm and finally ends at 29 degrees at 4000 rpm. Dauntless 225 V-6 Distributor | ECJ5 to come in between about 5 and 15 inches of manifold vacuum. HEI Distributor Tune-Up - Car Craft Magazine - MotorTrend to max. yes a HEI will fit,but with some modifications,first need to see if it'll clear the firewall,if not may need to "dent" in slightly,also will need to change the hot wire to power the HEI.not as hard as it seems,and i feel its well worth it.some one else had a posting on this and got an answer about a small cap HEI,check that out too . if ordered today. This can be because the posts are highly worn from the spark energy burning them away. advance with EGR = 51 total. At idle, with the vacuum advance hose disconnected and plugged at he carburetor, this is the timing that you see with the timing light on the timing marks. You want it to be in the normal "home" position, under advance spring tension, and with the weights fully retracted. your centrifugal advance doesn't "snap" back to zero when you twist it with your It won't fit. margin). ( 14 ), HEI Distributor Upgrade Kit, 50,000 V Coil, Cap, Rotor, GM V8, Clear, Kit, 4.7 out of 5 stars This need for advance is why distributors have an advance system built-in. This is a custom order part. Likewise, lighter springs and stock weights will incur the same result. Untruth: A long-running rumor that is often told relays that an inductive ignition like an HEI is not as good for use in high-performance engines as a capacitive discharge (CD) ignition. At idle, the timed vacuum port will have no vacuum. Results 1 - 25 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. ( 19 ), Estimated USA Ship Date: MSD Ultimate HEI Kits 85013. Some engines will idle too fast with the line connected to a manifold vacuum. Most carburetors have both ports. advance curve to come in too slowly, if it ever gets fully advanced at all. If I rev the engine quickly, sometimes it will come back to the original setting, but most of the time it does not. Both of these combined gives total advance. Some guys set timing while the engine idles, while others adjust things with the engine seemingly screaming past 6,000 rpm. We suggest consulting with an engine building and/or tuner professional who specializes in your particular make before swapping mechanical advance components. ( 8 ), HEI Distributor Upgrade Kit, Cap, Rotor, 65,000 V Coil, Cover, Alkyd, Red, Universal, V8, Kit, 4.0 out of 5 stars position as the picture above. total amount of vacuum advance. The first thing to set when curving a distributor is to set your initial and total advance. If 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. if ordered today. degrees if plugged into our previous example- OUCH!). Performance Tuning Your Distributor - RacingJunk News Full Forum Listing. ( 20 ), HEI Distributor Upgrade Kit, 50,000 V Coil, Red Cap, Red Rotor, GM, Kit, 5.0 out of 5 stars Like up to 26 When used in OE applications, these changes proved to be the perfect solution.
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