Assuming the engine stops turning so the points stay closed, C1 slowly discharges through the W terminal's resistance. He did complain about the GM HEI switching modules though. Terminal "W" provides a control voltage to the pickup. Generally, stock HEI modules are current-limited to about 4 amps. There are 4 versions of the adapter circuit described here. The Ford module looks like it would require allot less components to make it work. There are several different types of HEI modules. MSD molds their most popular distributor caps in-house. The beauty of an HEI is that even stock, it applies much more spark energy than a points-type ignition. The GM HEI 7 and 8 pin modules are simple to work with. Only on the second opening, and subsequent openings, will there be a spark. The cycle repeats and an oscillator is formed. In a GM HEI system, the module replaced the contacts of the breaker points and the pickup coil was substituted for the rubbing block and distributor cam. Dirt Cheap Ignition Retard for Turbocharged Engines for Less Than $100. The signal from the points must be inverted to operate the HEI correctly. JavaScript is disabled. I wasn't sure. (Davis Unified Ignition) HEI Distributor (www.performancedistributors.com). For maximum Ignitor III benefit, select one of the Flame-Thrower III or HC Ignition coils. Despite I like the simplicity of the HEI module. If, for some reason you have no spark coming from your distributor, the following will help you check and test the installation, connections, and components, of … If the coil-current is not interrupted by cranking the engine or shutting off the ignition switch, the time-out option interrupts the coil current automatically after about 5 seconds. When the points are open, C1 charges quickly through R1, LED1, R2, and D1. It used the stock coil. The terminals offer improved locking connections and the Rynite material is extremely strong with excellent dielectric properties. Module. This is not possible because when the coil turns off, the supply voltage inevitably jumps up. The HEI setup has also become a popular swap into non-GM vehicles. The HEI distributor is still an inductive-discharge ignition, but exchanges points for an electronic device called a module. Wiring for Typical Points Ignition System. The HEI and TFI are basically the same thing but the HEI has the proper input for a magnetic pickup distributor. The points control the inverter circuit. The HEI modules can be triggered by your points and fire your stock coils but you can't use the low-resistance Cavalier coils on the older Hondas. There is very little current in the inverter/points circuit so low-power devices will suffice for Q1 and R1. This means the voltage on the point go from 0 to some higher level (low to high) when a spark is to occur. In this system, it would be best to use a 3-ohm or higher coil in order to prevent excessive wear on the points during bypass operation. HEI distributors are a popular swap on older GM cars originally equipped with points and condenser type ignition systems. If the idea of touching wiring scares you, then read on to understand it better, and if this still isn't enough to enable you to feel comfortable doing this conversion, stop and find someone to help you. If I use a GM HEI ignition module, can I remove my ballast resistor? It should be noted that electrically the 7 and 8 pin modules are pretty much the same, the difference being the 8 pin module has an extra pin, G, which is simply an extra ground. This puts supply voltage onto C1 and thus W is also at the supply voltage level. Number 1 plug wire should be at the front of the distributor just to the driver’s side of centerline. The result is many spark events occur after the initial time-out. ... it's really easy to convert to a standard four-pin GM HEI module. If the points repeatedly open and close quickly, as in normal running, C1 never has time to fully discharge, but is fully charged every time the points open. This resistance will be used during the charging of the time-out capacitor C1. This control voltage extends the dwell to the ignition coil during high-rpm operation. Terminal "B" is the power connection for the module. Wiring for Typical HEI Ignition System: Another important issue is the combination of voltage regulator and HEI module that you are using. When GM designed the high energy ignition (HEI), engineers combined the electronic module with a completely new design coil called an E-core or laminated core coil. First of all, BIG THANKS to whoever mentioned using the 5 pin HEI module as a cheap alternative to an MSD system. In order to prevent damage from this condition, a "time-out" option has been devised. If you have a mechanical regulator (stock on pre-71), you may have problems with burnt out HEI modules. This means if the power is turned on while the points are closed, there will be no spark the first time the points open. Diagram together with GM HEI Ignition Module Wiring Diagram. The 4-pin GM HEI module is first class for most applications. G follows W through internal circuitry, so, after 5 seconds, the voltage on G is at 1.4 volts and the coil current is interrupted. Interrupting the ground path causes the coil to generate a spark. Rule of thumb: If you have a GM with HEI 7 or HEI 8 module, use this. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! I am very satisfied with my installation on the Slant Six engine in my Dodge Aspen Wagon, instead of the stock Mopar unit that uses a ballast resistor. There are two plastic locator pins on the bottom of the module, which should be cut off in order to mount it flush to a plate. It did away with the conventional points and condenser and used a magnetic pickup. The control voltage will not be used in this project. The High Energy Ignition (HEI) used on most General Motors products prior to the use of fuel injection was a hall effect type of distributor. The basic MSD 6A module runs about $130, and the top end, the MSD Off-Road Module is about $240.-----The GM HEI ignition, and ALL of it's clones are from a defective design to start with. well, the GM HEI needs a small voltage 1-3 volt and it must be an AC signal.The module fires the coil on the descending voltage spike of each pulse of the magnetic pickup. In the 1970's Radio Shack had a kit you could assemble, and solder, that would use points to trigger an CD ignition box. When C first opens, the ignition coil produces a spark. An HEI module is designed to be controlled by an inductive pickup. The design in Fig. 4 also used far fewer parts than the other designs. Many parts stores can test the HEI ignition module at no charge. It will spin the tires in 2nd gear at full throttle. Please refer to them in the following descriptions. The HEI uses a pointless distributor. This outboard has a distributor under the flywheel. If you cannot handle basic cutting and drilling of metal (needed to make the heat sink), sto… HEI Modules: 1. Other designs were tried in which the time delay was generated by the charging of a capacitor. Ignitor III modules provide ignition box performance without the "box". The HEI distributor has eliminated the need to do roadside tune ups to a point-style distributor. However, the inverter Q1 is shorting out the G terminal so there is no current through the coil. Yugos, Fiats, and Trabants! on gm hei Most of the original modules installed in Chevrolet distributors from the mid-80s through the mid-90s shared the same solid-state design. This system consists of a star-shaped wheel on the center shaft, which passes in front of a magnetic pickup. This causes a voltage pulse to travel through the charging capacitor, which turns the coil back on. The control module basically performs the same function as the breaker points in a points and condenser system. A few details should be mentioned about the circuit. Oct 29, 2013. This produces a single spark. R1 and Q1 create an inverter circuit. Terminal "C" is the output for the module. Q1 grounds out the G terminal when the points open. Fact is stranger than Fiction The adapter is basically an inverter. The E-core cools the windings more efficiently because the coils are exposed to the air. : If you have ever built a custom turbo system for your car, it's often nessessary to reduce the advance during boost … Thus, for the module to charge and then collapse the coil, it needs to receive a signal from the pick-up coil. This means C is shorted and the ignition coil has a path to ground. Normal operation will resume as soon as the engine is cranked over. General Motors developed the High Energy Ignition, also known as the HEI system. When the voltage at G is higher than about 1.6 volts, the C terminal is grounded which completes the ignition coil's ground path. The control module switches the flow of current to the coil courtesy of the black, red and tan wires pictured in the foreground of the accompanying photo. It was first equipped on some GM cars and trucks beginning in the early seventies, and became standard equipment by the mid-seventies. All you need to do is replicate that voltage/sine wave characteristic with a set of points and you are good to go. You must retain the ballast reistor if you wish to 3. Within the General Motors supply system, the choice in HEI system type was important based on the engine that it was used in. One has 2 pins, it is used for the coil. I replaced the 1.5" exhaust with a fat 2.25" and the car screams now. David Vizard did some testing on the old-style V8 HEI mechanical advance distributors, and in Chevy Small Blocks on a Budget reported no problems with the magnetic pickups out past 6000 rpm. One project circuit is required for every ignition coil. A forum community dedicated to hot rod owners and enthusiasts. The original equipment GM ignition control module can go a long way before it leaves you high and dry. You deserve an award for keeping those things running. The HEI module triggers a spark when the input voltage goes from a higher voltage to a low or negative voltage (high to low). Therefore, a 4-cylinder KZ will require two circuits. To download a printable version of the text, click this. Starts every time and run like a clock! Because of the design, the first spark occurs only after the first time the points are opened to charge C1. Meanwhile, G is no longer shorted and "floats" up to a voltage level equivalent to that of W. Therefore, the ignition-coil current is "on". The time-out option is implemented through the use of the internal components in the W terminal, though the components were not intended for this use. When I say high and dry I'm talking about a vehicle that cranks around, but will not fire up. Installation tips. The design in Fig. This resistance is required for the coil, not the ignition module. The HEI system produces a more powerful spark, which allows for a wider spark plug gap for surer ignition of a fuel/air mix that may not be optimal. As far as I can tell the old 4-pin GM HEI modules … It takes about 5 seconds for C1 to discharge to 1.4 volts. For a better experience, please enable JavaScript in your browser before proceeding. This project is to adapt a General Motors High Energy Ignition (HEI) module to provide spark for any Kawasaki KZ motorcycle originally equipped with points. This project is to adapt a General Motors High Energy Ignition (HEI) module to provide spark for any Kawasaki KZ motorcycle originally equipped with points. You'll experience 5 times more spark energy than a typical points system. Jseabolt, there are two different actions going on when using an electronic distributor vs a points distributor. In the accompanying drawing, they are labeled Fig.1, Fig.2, Fig.3 and Fig.4. However you can use a GM 4-pin HEI module. You can also use points to trigger it and with an additional bypass circuit have the piece of mind of going back to stock point/condenser/coil with the flip of a switch. I use the HEI together with an ordinary Standard e-core coil, used on Fords and Mazdas. Jeff Smith writer. The 7 Pin HEI Module. 1969 Evinrude 55hp outboard. The dwell-control voltage is overridden by connecting W to the supply voltage. How To Convert A Ford Or Chrysler Ignition To GM HEI Junkyard Builder. However, the W terminal is used for another purpose in the time-out option of this project. HEI uses no ballast resistor or resistance wire. I use NGK UR45IX spark plugs, that comes pre-gapped at .059"! In order to use an HEI module with points, a small adapter circuit is required between the points and the HEI module.
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