Engine displacement

Volume swept by all of the pistons / From Wikipedia, the free encyclopedia

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Engine displacement is the measure of the cylinder volume swept by all of the pistons of a piston engine, excluding the combustion chambers.[1] It is commonly used as an expression of an engine's size, and by extension as a loose indicator of the power an engine might be capable of producing and the amount of fuel it should be expected to consume. For this reason displacement is one of the measures often used in advertising, as well as regulating, motor vehicles.

One complete cycle of a four-cylinder, four-stroke engine. The volume displaced is marked in orange.

It is usually expressed using the metric units of cubic centimetres (cc or cm3, equivalent to millilitres) or litres (l or L), or ā€“ particularly in the United States  ā€“ cubic inches (CID, cu in, or in3).