four-stroke engine
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A four-stroke engine is a type of internal combustion engine that completes its power cycle in four separate strokes of the piston, making it one of the most common designs used in cars, motorcycles, and other vehicles. It matters because this design is fuel-efficient and produces relatively low emissions compared to other engine types, which is why it has become the standard for most modern transportation.
AI-generated from the Wikipedia summary — may contain errors.
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Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.
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. A stroke refers to the full travel of the piston along the cylinder, in either direction. The four separate strokes are termed: