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High energy ignition
High energy ignition, also known as H.E.I., is an electronic ignition system designed by the Delco-Remy Division of General Motors. It was used on all GM vehicles, at least in the North American market, from 1975 through the mid-1980s.[vague] The system is an electronic system that requires no scheduled maintenance, provides up to 35,000 volts to fire the spark plugs and increase spark plug life, especially when unleaded fuel is used. The HEI system has 40% more voltage output and 85% higher energy level than conventional breaker point systems to fire lean fuel mixtures even under adverse conditions.
There were many design variations over the years, and provisions for computer controls were added for some applications starting in the late 1970s. A predecessor system called "Unitized Ignition" was optional on 1972 and 1973 Pontiacs. [citation needed]
Most—but not all—HEI systems have the ignition coil mounted in the distributor cap. A control module and magnetic pickup are mounted in the distributor, in place of a conventional ignition system's breaker points and condenser.
The HEl system was developed as an integrated package that combines the distributor, magnetic pick-up, ignition coil and electronic module into one package. By doing this, these components are well protected from physical and environmental abuses and the number of electrical connections are reduced.
There are some models that use a remotely mounted coil. This coil is constructed the same as the integral coil with the exception of a mounting bracket and a terminal for the connection of a high tension lead. These models are used on engines where additional clearance was needed.
The size of the distributor was increased due to the wide spacing that must exist between the' distributor cap Inserts to prevent high voltage arc-over. A wider spacing was also needed between the cap, inserts and the distributor housing to prevent arc-over and leakage to ground.
The higher voltage output of the HEI system required new insulation materials. To prevent ignition failure due to carbon tracking, a special material is used for the distributor cap and rotor. It is a thermoplastic, injection-molded, glass-reinforced polyester. This material provided the dielectric and insulation properties needed and also prevented carbon tracking.
The high voltage terminals used in the distributor cap are similar in appearance to spark plug terminals. These connections provide easier attachment and better sealing of the connections. Latches are used to ensure proper connections of the plug wires to the cap and prevent any loosening or movement which might reduce the moisture of the connection. The spark plug wires are a carbon-impregnated cord conductor encased in an 8 millimeter diameter silicone jacket. Silicone wiring will withstand very high temperature and is an excellent insulator for higher voltages.
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High energy ignition AI simulator
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High energy ignition
High energy ignition, also known as H.E.I., is an electronic ignition system designed by the Delco-Remy Division of General Motors. It was used on all GM vehicles, at least in the North American market, from 1975 through the mid-1980s.[vague] The system is an electronic system that requires no scheduled maintenance, provides up to 35,000 volts to fire the spark plugs and increase spark plug life, especially when unleaded fuel is used. The HEI system has 40% more voltage output and 85% higher energy level than conventional breaker point systems to fire lean fuel mixtures even under adverse conditions.
There were many design variations over the years, and provisions for computer controls were added for some applications starting in the late 1970s. A predecessor system called "Unitized Ignition" was optional on 1972 and 1973 Pontiacs. [citation needed]
Most—but not all—HEI systems have the ignition coil mounted in the distributor cap. A control module and magnetic pickup are mounted in the distributor, in place of a conventional ignition system's breaker points and condenser.
The HEl system was developed as an integrated package that combines the distributor, magnetic pick-up, ignition coil and electronic module into one package. By doing this, these components are well protected from physical and environmental abuses and the number of electrical connections are reduced.
There are some models that use a remotely mounted coil. This coil is constructed the same as the integral coil with the exception of a mounting bracket and a terminal for the connection of a high tension lead. These models are used on engines where additional clearance was needed.
The size of the distributor was increased due to the wide spacing that must exist between the' distributor cap Inserts to prevent high voltage arc-over. A wider spacing was also needed between the cap, inserts and the distributor housing to prevent arc-over and leakage to ground.
The higher voltage output of the HEI system required new insulation materials. To prevent ignition failure due to carbon tracking, a special material is used for the distributor cap and rotor. It is a thermoplastic, injection-molded, glass-reinforced polyester. This material provided the dielectric and insulation properties needed and also prevented carbon tracking.
The high voltage terminals used in the distributor cap are similar in appearance to spark plug terminals. These connections provide easier attachment and better sealing of the connections. Latches are used to ensure proper connections of the plug wires to the cap and prevent any loosening or movement which might reduce the moisture of the connection. The spark plug wires are a carbon-impregnated cord conductor encased in an 8 millimeter diameter silicone jacket. Silicone wiring will withstand very high temperature and is an excellent insulator for higher voltages.