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Holley-style carburetors powered every NASCAR Sprint Cup team and every NHRA Pro Stock champion until both series eventually switched to electronic fuel injection (EFI). NASCAR Sprint Cup engines still utilize a Holley throttle body and Holley EFI is the spec EFI system in NHRA Pro Stock.
In 1987, it used a two-barrel Holley carburetor and hydraulic valve lifters. In 1988, it was upgraded with throttle-body fuel injection and roller lifters. For the 1992 Magnum update, the throttle-body fuel injection was upgraded to a multi-port fuel injection system. In 1997, it was then upgraded to sequential fuel injection. The engine was ...
At lesser throttle openings, the air speed through the venturi may be insufficient to maintain the fuel flow, so then the fuel may be supplied by the carburetor's idle and off-idle circuits. At greater throttle openings, the speed of air passing through the venturi increases, which lowers the pressure of the air and draws more fuel into the ...
Instead, the position of the throttle valve (i.e., the amount of air in the engine) is fully controlled by the ETC software via the electric motor. But just opening or closing the throttle valve by sending a new signal to the electric motor is an open loop condition and leads to inaccurate control.
The 170 cu in (2.8 L) Slant-6 engine remained standard equipment, though its power rating rose from 101 bhp (75 kW) to 115 bhp (86 kW) for 1967, owing to the installation of the 225 engine's 1 barrel Carter BBD or Holley 1904 series carburetor and the revised camshaft the bigger engine had received in 1965.
"I've bought a number of outlet expanders over the years and the early ones were terrible. Big, bulky, ugly and only added an extra outlet spot or two," said one fan.The Qinliaf, they continued ...