increasing boost does not increase compression ratio

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Posted by jack cain on Thursday, November 08, 2007 at 15:19:40 :

In Reply to: 10:1, plus 15#, = 20:1? posted by chriscase on Thursday, November 08, 2007 at 11:14:33 :

Increasing boost does not increase the Static Ccompression Ratio, by defintion it cannot.

The Static Compression Ratio is the ratio of the volume above the piston at TDC (right) compared to the volume at BDC (left). Atmospheric pressure is not taken into consideration.

Because of lower VE (Volumetric Efficiency) in naturally aspirated enignes the Dynamic Compression Ratio is actually less than in engines with a lower Static Compression Ratio but a greater VE due to forced induction.

Follow Ups:

i know that but.. - DoDgEBoY - MaDe in the USA 20:42:32 11/08/2007

Yes, it is all theoretical... - chriscase 18:38:51 11/08/2007

Helmholtz resonance - jack cain 19:20:32 11/08/2007

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