Exhaust
Exhaust is one of the strokes for generating power inside a cylinder. It follows the combustion stroke.
For example, when a piston nears bottom dead center on the compression stroke of a gasoline engine, the exhaust valve opens. As the piston starts moving toward top dead center, combustion gas is discharged from the cylinder.
When the piston reaches top dead center, the exhaust valve closes and the piston advances to the intake stroke again.
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