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AUTO.6
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1992-03-22
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Fuel is drawn to the appropriate cylinder by vacuum created by the piston
moving down in the cylinder. The gasoline is fed into the cylinder by
either EFI (Electronic Fuel Injection) or by a carburetor. By some special
controls, a specified amount of air is admitted and mixed with the gas to
allow for combustion. If there were no air in the cylinder, there would be
no explosion. And, simply enough, the engine wouldn't run.
There are two downward strokes of the piston in every one revolution of
the engine. One, as pointed out, occurs when the gasoline/air mixture
explodes and is referred to as a power stroke.
The other stroke occurs on the next downward movement of the piston and
is referred to as the intake stroke when the vacuum is formed to draw in
the fuel.
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