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All gasoline engines have a throttle valve to control the volume of
intake air. The amount of fuel and air that goes into the combustion
chamber regulates the engine speed and, therefore, engine power. The
throttle valve is linked to the accelerator (gas pedal). The throttle
valve is a butterfly valve that usually consists of a disc mounted on
a spindle. The disc is roughly circular, and it has the same diameter
as the main air passage in the throat or "venturi". In a carburetor,
the throttle valve is usually located at the bottom of the
carburetor, between the jet nozzle and the intake manifold. The
throttle spindle is connected to the accelerator in such a manner
that when the pedal is depressed, the valve opens. When the pedal is
released, the valve closes. Fuel injected engines use throttle valves
to regulate engine power, even though the fuel is also regulated
through the injectors.
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