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NASCAR Sprint Cup engines still utilize a Holley throttle body and Holley EFI is the spec EFI system in NHRA Pro Stock. Holley's product range has expanded to include the aforementioned fuel injection systems, performance fuel pumps, intake manifolds, superchargers, nitrous oxide injection, performance plumbing parts, exhaust systems, engine ...
Fuel injection allows a precise amount of fuel to suit the amount of air flowing through the engine, making it more efficient. [ 4 ] [ 5 ] [ 6 ] Fuel injection is also used to regulate the horsepower rating of the stock cars, making the sport safer, providing for more fuel efficient vehicles, in addition to cleaning the environment for the ...
Programmed Fuel Injection, or PGMFI/PGM-FI, is the name given by Honda to a proprietary digital electronic multi-point injection system for internal combustion engines. It has been available since the early 1980s. This system has been used in motorcycles, automobiles, and outboard motors.
Injection phase Partway through the pump stroke, the solenoid is energized, which closes the spill valve. The fuel is forced into the cylinder through the spray tip. Pressure reduction phase Toward the end of the pump stroke, the spill valve is re-opened, allowing the fuel to recirculate again and ending the injection phase.
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The Ford EEC-III single-point fuel injection system, introduced in 1980, was another early digital fuel injection system. [ 53 ] [ 54 ] These and other electronic manifold injection systems (using either port injection or throttle-body injection ) became more widespread through the 1980s, and by the early 1990s they had replaced carburettors in ...
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