Re: M3 Compression Ratio. Velocity pressure to static?

[dozenne@xxxxxxxxxx (David Ozenne)]

Neil Deshpande wrote:
> If the highest measured pressure at a cylinder is 13.75 bar, and the
> intake pressure is atmospheric or 1 bar (actually, I remember that about
> 1.012 bar is 760 mm Mercury or 1 atm), should not the compression ratio be
> about 13.75:1? 

The compression is not isothermal, so the pressure change is not
directly proportional to the compression.  I.e., when you compress
the air in the cylinder, it heats up, too.

David Ozenne
'90 325iC

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