[Vwdiesel] turbo boost & compression ratios

[Harmon Seaver]

   Ahh, cool, thanks. Yes, I mispoke -- I know it doesn't change the real engine
compression ratio, but the end effect is the same. 


On Tue, Apr 20, 2004 at 10:59:45AM -0700, Roger Brown wrote:
> Harmon Seaver wrote:
> > 
> >    Does anyone know of a formula for figuring out how much a turbo raises
> > compression ratios?
> 
> Compression ratio of the engine doesn't change when adding a turbo.  You are changing the pressure (or density or amount) of the intake air by the amount of boost that the turbo gives.  That increased pressure is essentially magnified by the existing
> compression ratio to give you a higher combustion pressure.  Here's a few interesting pages from a Google search of the subject:
> 	http://www.teknett.com/pwp/drmayf/comprato.htm
> 	http://www.smokemup.com/auto_math/pressure_ratio.php
> 
> -- 
>    Roger
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-- 
Harmon Seaver	
CyberShamanix
http://www.cybershamanix.com
Hoka hey!