Editing Engine displacement (section)

{{Short description|Volume swept by all of the pistons}}
{{redirect|Swept volume|the 3D display technology|Swept-volume display}}
{{Use dmy dates|date=December 2019}}
{{Use British English|date=January 2020}}
[[File:Displacement.gif|thumb|upright=1.35|One complete cycle of a four-cylinder, [[four-stroke engine]]. The volume displaced is marked in orange.]]
'''Engine displacement''' is the measure of the [[cylinder (engine)|cylinder]] [[volume]] swept by all of the pistons of a [[piston engine]], excluding the [[combustion chamber]]s.<ref>{{cite web |title=Piston Engine Displacement |url=https://www.engineeringtoolbox.com/piston-engine-displacement-d_811.html |website=The Engineering Toolbox |access-date=18 August 2021}}</ref> It is commonly used as an expression of an engine's size, and by extension as an indicator of the [[engine power|power]] (through [[mean effective pressure]] and [[rotational speed]]) 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.

It is usually expressed using the [[metric system|metric]] units of [[cubic centimetre]]s (cc or cm<sup>3</sup>, equivalent to [[Litre#SI prefixes applied to the litre|millilitres]]) or [[litre]]s (l or L), or{{snd}}particularly in the United States {{snd}}[[cubic inch]]es (CID, cu in, or in<sup>3</sup>).