![]() This is the result of the piston moving upwards, reducing the volume of the chamber. In this stage, the air-fuel mixture (or air alone, in the case of a direct injection engine) is compressed to the top of the cylinder by the piston. The compression stroke is the second of the four stages in a four-stroke engine. The mixture enters the cylinder through an intake valve at the top of the cylinder. It involves the downward movement of the piston, creating a partial vacuum that draws an air-fuel mixture (or air alone, in the case of a direct injection engine) into the combustion chamber. The induction stroke is the first phase in a four-stroke (e.g. Other types of engines can have very different phases. those used in a four-stroke engine) are described below. Phases in the power cycle The phases/strokes of a four-stroke engine.Ĥ: exhaust Animation of a two-stroke engineĬommonly used engine phases or strokes (i.e. The stroke length, along with bore diameter, determines the engine's displacement. ![]() "Stroke length", the distance travelled by the piston during each cycle. ![]()
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