Once racers got ahold of the MSD ignition systems, the HEI type distributors were pulled out and left in cardboard boxes or tossed in the … Saved from search.yahoo.com. These modules provide enhanced high RPM performance and when used with their corresponding Flame-Thrower coil, substantially increase spark plug voltage. 68-77 Corvette . I'm using a stock cap/coil, and have used assorted HEI modules. The vehicle's performance is affected if the sparks plugs misfire or stop producing a spark. [vague] There were many design variations over the years, and provisions for computer controls were added for some applications starting in the late 1970s. What would cause this? It was inevitable that MSD Ignition would eventually tackle the HEI rpm issue with a redesigned HEI ignition module capable of high rpm MSD performance in a stock type application. Comparing the HEI components to those in a conventional distributor makes it easier … However, you can … We've sent you an email with a link to update your password. The ignition module uses input from the crankshaft position sensor or camshaft position sensor to determine when to fire the spark plugs. Like all automobile components, the ignition module will eventually deteriorate and break. The system consists of a control module and a magnetic pickup mounted in the distributor. On some … Next, reinstall your distributor cap. Make sure to use the DR100 type modules, or one from the same family as described in the HEI module notes. The ignition module may be located inside the distributor, on the distributor housing, or mounted to the side of the engine compartment. Twilight Garage Ignition Control Module 4 Pin HEI Distributor D1906 LX301 Compatible with 1974-1987 GMC Buick Cadillac Oldsmobile Pontiac. The HEI ignition requires a switched (turns on and off by a switch) 12V DC power supply (without any resistance from a ballast resistor or a resistor wire like was used on many GM points-type ignition systems), and a ground. We mounted our HEI module on a 1/8-inch thick aluminum plate and added a wiring terminal strip just for grins, but this could be easily eliminated. Ignition Modules, Flame-Thrower HEI III 4-Pin Ignition Modules, Race Module, 4-pin, 7.1 amps Draw, Buick, Cadillac, Chevy, GMC, Olds, Pontiac, Each PerTronix HEI Modules. Apply a liberal coat before you start the process of installing the module. With a GM HEI 7-pin (and 8-pin modules), the ignition module wires you need to know about are: tach signal is a purple wire with a white trace [pin R] goes to Ampseal OPTOIN+ pin #30 (ground the Ampseal OPTOIN- pin #31 at the distributor) ; advance control signal is a white wire [pin E] goes to Ampseal pin #12; override (cranking) signal is a tan wire … When you're trying to generate horsepower, making sure you've got enough fire can be an uphill climb and the climb becomes more difficult as the RPM range reaches peak power. Saved by Yahoo Life. To check the spark plugs for current, you will grab your 12v test light and tap into your spark plugs terminals. If you have any issues or need any help,please don’t hesitate to contact us,we will our best to help you solve it. I have used this system on both of my custom turbocharged cars and it works well. Only 17 left in stock - order soon. GM vehicles are equipped with an ignition control module. HEI 4 pin ignition module being used to trigger the MSD Pro Billet distributor with the magneticIf you do upgrade to an electronic dist. Free shipping on orders over $100 in contiguous 48 states. I used to have info on the pinout of GM HEI 4-pin ignition modules. The HEI also has two methods for … Only 16 left in stock - order soon. The ignition module is extremely accurate in its delivery of energy resulting in more accurate ignition timing. With those four simple connections, plus adding a ground between the module, mounting base, and the engine and battery, will produce a functioning ignition system. Choosing a selection results in a full page refresh. 0000lbs. The four-pin module was used on carbureted engines and uses conventional mechanical timing controls (vacuum and centrifugal advance mechanisms). Replace module and problem … Generally, stock HEI modules are current-limited to about 4 amps. HEI style preferred but not abso-lutely required. based on the GM HEI module will allow you to get a replacement module nearly anywhere! Toyota Igniter (ignition module) was on the way out (along with the rest of my ignition, see previous videos). These days there's a plethora of aftermarket high-performance modules, coils, and complete ready-to-run HEI … Accel 35361 Gm Hei 74-95 High Performance Ignition Module W/Grease 4.4 out of 5 stars 27. Multiple sparks through the entire RPM range, Integrated digital REV limiter with LED feedback for precise RPM setting, Adaptive dwell maintains peak energy throughout the entire RPM range, reducing misfires while improving engine performance, Peak current level is reached just prior to spark for maximum energy without heat build-up, increasing coil performance and module reliability, Adjusts spark timing at higher RPMs to compensate for the inherent electronic delay, Senses startup and increases energy for quicker, easier starting, Legal in all 50 state and Canada (C.A.R.B. 3.1 out of 5 stars 3. PerTronix HEI Performance Ignition Modules are direct replacements for popular GM and Ford electronic distributors. Since diagnosing the module, pickup, and the coil of an HEI distributor is a little trickier than an old-school points distributor, we checked in with the folks at Performance Distributor to get some diagnostic input. The … 95. Step 2 : Check your ICM Spark Plugs ( ignition module ) for current. The 7 Pin HEI Module. If your parts guy doesn't know what that is then tell him you need an ignition module for a '78 Camaro with a 350. nastogadka/Pixabay. HEI is characterized by the incorporation of the ignition coil into the distributor cap for most applications. The E-core cools the windings more efficiently because the coils are exposed to the air. The voltage is interrupted every time the star wheel causes a pulse in the voltage. Having a robust ignition is key. This module is a direct plug in for the 4-pin HEI module. I'm using a stock cap/coil, and have used assorted HEI modules. I've used Accel brand, & a couple different generic ones and an AC Delco one, they all only seem to last a few months. The seven- and eight-pin modules are used on early computer-controlled engines. This allows the coil designer to reduce the coil’s internal resistance. 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