![]() In this stroke the piston compresses the air-fuel mixture in preparation for ignition during the power stroke (below). Compression: This stroke begins at B.D.C, or just at the end of the suction stroke, and ends at T.D.C. In this stroke the intake valve must be in the open position while the piston pulls an air-fuel mixture into the cylinder by producing a partial vacuum (negative pressure) in the cylinder through its downward motion.ΔΆ. This stroke of the piston begins at top dead center (T.D.C.) and ends at bottom dead center (B.D.C.). Intake: Also known as induction or suction. A stroke refers to the full travel of the piston along the cylinder, in either direction. A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. ![]()
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