Best Answer

There is no "unit". It is a ratio. Just pick a unit. Since you're likely talking about engine displacement, liters are a good unit to use.


Engines are described in litres, but individual cylinder volumes are normally expressed in cubic centimetres (c.c.), but the compression-ratio is the same irrespective of measurement units because a ratio is dimensionless.

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Q: What unit is a compression ratio measured in?
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What is the highest compression ratio?

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