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What does engine compression ratio mean?

1 Answers

McCamille

07/29/25 9:01am

Engine compression ratio refers to the degree to which the engine's gas mixture is compressed, expressed as the ratio of the total cylinder volume before compression to the cylinder volume after compression. The following is a detailed introduction to engine compression ratio: Utilization of engine compression ratio: To meet the requirements of the National IV (Euro IV) emission standards for carbon emissions (i.e., fuel consumption), automobile manufacturers generally increase the engine compression ratio to between 9 and 12. Among these, 9 to 10.5 is mainly used for turbocharged engines, while 10.0 to 12 is primarily used for naturally aspirated engines. Definition of engine compression ratio: The ratio of the total cylinder volume to the combustion chamber volume in an internal combustion engine is an important structural parameter. When the piston is at the bottom dead center, the cylinder has the maximum volume, denoted as Va; when the piston is at the top dead center, the volume inside the cylinder is called the combustion chamber volume, denoted as Vc.

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