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