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High energy ignition
High energy ignition, also known as H.E.I., is an electronic ignition system designed by Delco-Remy Division of General Motors and introduced by General Motors around May 1974 on most GM engines. It was used on all engines in 1975 through the mid-1980s. There were many design variations over the years and provisions for computer controls were added for some applications starting in the late 70's. A predecessor system was optional on Pontiacs as "code 704 UPC K65 unitized ignition system" for the 1972-73 model year.
HEI is characterised by the incorporation of the ignition coil built into the distributor cap for most applications. The system consists of a control module and a magnetic pickup mounted in the distributor. This eliminates ignition points and the coil wire. The control module basically performs the same function as the breaker points in a points and condenser system.
==Control modules==
There are three basic types of HEI control modules, the four-pin, five-pin, and seven-pin modules. The four-pin module was used on conventional carbureted engines and uses conventional mechanical timing controls (vacuum and centrifugal advance mechanisms). The five-pin module was introduced in 1978 and was an early attempt at electronic timing control. The five-pin module contains a provision for connecting a knock sensor. The seven-pin module is used on early computer-controlled engines. The seven-pin module contains no mechanical timing control mechanisms as the computer controls ignition timing. Late 1980's GM cars and trucks used a slim distributor cap HEI with a separate ignition coil on throttle body injection equipped engines. These distributors were not stand-alone units because they did not contain mechanical timing controls.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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