Intake
Intake is the first stroke for generating power in a cylinder.
It follows the exhaust stroke.
For example, on an intake stroke of a gasoline engine, the
intake valve opens and the piston moves from top dead center to
bottom dead center. This movement generates negative pressure in
the cylinder, which draws in the air-fuel mixture. As the
air-fuel mixture is drawn in, the exhaust valve closes.
This is followed by the compression stroke.
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