What does HEI mean in automotive?
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.
What does the HEI ignition module do?
With an electronic module, an HEI can safely operate at much higher current loads. More power applied across the primary circuit of the coil means the coil can apply greater spark energy to the spark plugs. This additional power ensures more complete combustion at both idle and at wide open throttle.
What year did GM start using HEI?
Chevrolet’s High Energy Ignition (HEI) from the Delco-Remy Division of General Motors was first offered in 1974 on production cars, though in very limited numbers. In 1975, HEI became standard on all GM vehicles.
What are the advantages of an HEI distributor?
The HEI system produces a more powerful spark, which allows for a wider spark plug gap. This delivers better ignition of the fuel/air mixture. The HEI setup was so popular, it became a must-do swap into non-GM vehicles as well.
How do I adjust my HEI vacuum advance?
You can easily adjust the vacuum advance of the Street Fire Distributor. Insert a 3/32″ Allen wrench in the canister inlet and turn the adjustment screw clockwise until it is all the way in (Figure 2). Counter clockwise reduces the advance, clockwise increases.
Does HEI need a coil?
Actually most HEI systems run well with spiral-core wires. The spiral core prevents internal wire vibration and prevents electronic interference. Myth 8: The silicone grease you place under an HEI module insulates from heat.
Do HEI distributors have points?
The HEI distributor is still an inductive-discharge ignition, but exchanges points for an electronic device called a module. Since this system produces more voltage and amperage output than a point-type ignition, it requires a larger-diameter cap to prevent voltage crossfire inside the distributor cap.
How many volts does a stock HEI put?
An HEI should have a 10 guage wire run to it. If it’s hooked to stock wiring it may not be getting a full 12 volts. Many cars had ballast resistors or resistor wire running to the stock coil. A GM HEI should run on as low as 9 volts but 12-14.5 is required for good performance.