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Compression ratio
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{{Short description|Ratio of the volume of a combustion chamber from its largest capacity to its smallest capacity}} {{hatnote|This article focuses on the compression ratio of piston engines. It should not be confused with the [[overall compression ratio]] of a gas turbine or jet engine.<br> For compression ratio in data compression, see [[Data compression ratio]]}} {{More citations needed|date=July 2019}} [[File:4StrokeEngine Ortho 3D Small.gif|thumb|right|225px|In piston engines, '''static compression ratio''' is determined using the cylinder volume when the piston is at the top and bottom of its travel.]] The '''compression ratio''' is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a [[reciprocating engine|piston]] or [[Wankel engine]]. A fundamental specification for such engines, it can be measured in two different ways. The simpler way is the '''static compression ratio''': in a [[reciprocating engine]], this is the ratio of the volume of the cylinder when the piston is at the [[bottom dead center|bottom of its stroke]] to that volume when the piston is at the [[top dead center|top of its stroke]].<ref>{{citation |last=Encyclopædia Britannica |title=Compression ratio |url=https://www.britannica.com/technology/compression-ratio}} </ref> The '''dynamic compression ratio''' is a more advanced calculation which also takes into account gases entering and exiting the cylinder during the compression phase.
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