A four-cylinder engine

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A four-cylinder engine is a type of internal combustion engine commonly used in various vehicles, such as cars, motorcycles, and small trucks. It is characterized by having four cylinders arranged in a specific configuration, typically in line (where the cylinders are aligned in a row), in a V-shape (two sets of two cylinders forming a V), or occasionally in a flat configuration (horizontally opposed cylinders). Each cylinder houses a piston that moves in an up-and down motion within it.