Displacement indicates engine size, and compression ratio compares the total cylinder volume to compression chamber volume.

位移表明发动机的大小，和压缩比比较气缸总容积压缩室容积。

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The method used to determine volume-reduction ratio for scroll compressor with modified profile is proposed. Formula for compression pockets and volume-reduction ration are given.

提出了一种修正型线涡旋压缩机内容积比的确定方法，给出了压缩腔容积和内容积比计算公式。

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Its Variable Compression Engine can alter its compression ratio (the volume in a cylinder when the piston is up compared with the volume when it is down) from 14-1 to 8-1, depending on the circumstances.

ECONOMIST: Fuel economy