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A throttle body is somewhat analogous to the carburetor in a non-injected engine, although it is important to remember that a throttle body is not the same thing as a throttle, and that carbureted engines have throttles as well. A throttle body simply supplies a convenient place to mount a throttle in the absence of a carburetor venturi.
Single-point injection (also called 'throttle-body injection') [17] uses one injector in a throttle body mounted similarly to a carburettor on an intake manifold. As in a carburetted induction system, the fuel is mixed with the air before entering the intake manifold. [ 15 ]
At lesser throttle openings, the air speed through the throat may be insufficient to maintain the fuel flow, so then the fuel may be supplied by the carburetor's idle and/or off-idle circuits. At greater throttle openings, the speed of air passing through the throat increases, which lowers the pressure of the air and draws more fuel into the ...
A pressure carburetor is a type of fuel metering system manufactured by the Bendix Corporation for piston aircraft engines, starting in the 1940s. It is recognized as an early type of throttle-body fuel injection and was developed to prevent fuel starvation during inverted flight .
In 1985, the 4.3 L (262 cu in) was either equipped with throttle-body fuel injection (RPO LB4) or a Rochester Quadrajet four-barrel carburetor (RPO LB1). The Chevrolet Caprice, Chevrolet Monte Carlo, Chevrolet El Camino, Pontiac Parisienne, and Pontiac Grand Prix used the LB4 rated at 130 hp (97 kW).
It is usually installed right behind the throttle valve in the throttle body. Single-point injection was a relatively low-cost way for automakers to reduce exhaust emissions to comply with tightening regulations while providing better "driveability" (easy starting, smooth running, freedom from hesitation) than could be obtained with a carburetor.
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