In this phase, the piston moves upwards, squeezing out the gasses that were created during the combustion stroke. The exhaust stroke is the final phase in a four stroke engine. The force created by this expansion is what creates an engine's power. The combustion stroke is the third phase, where the ignited air/fuel mixture expands and pushes the piston downwards. 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 fuel/air 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 four stages in a four-stroke engine.
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