Four-stroke engine

A four-stroke engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction. The four separate strokes are termed:Intake: Also known as induction or suction.

This stroke of the piston begins at top dead center (T.
D.
C.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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