![]() Towards the end of this phase, the mixture is ignited, by a spark plug for petrol engines or by self-ignition for diesel engines.Ĭombustion-power-expansion stroke 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.Ĭommonly 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.The type of power cycle used by a piston engine (e.g.compression stroke, exhaust stroke), during which the piston travels from top to bottom or vice versa. ![]() In the context of an internal combustion engine, the term stroke has the following related meanings: ![]()
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