Does anyone know a formula for calculating dynamic CR for a SC motor? I know formulas for estimating dynamic CR on an NA motor but have been unable to find any related formulas that apply to a SC setup.

I am not referring to those tables that purport to give the dynamic CR based on just static CR and boost. These must be extremely oversimplified to the point of being useless. Obviously, to approximate dynamic CR you need to account for cam timing and the ratio of swept volume to combustion space volume in addition to static CR and boost (or VE).

Any help would be appreciated. I am trying to increase my understanding of the relationship between cam timing, CR, engine geometry, boost, and hp.

Thanks.

Rich Krause

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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

See if this is what you want

http://www.rbracing-rsr.com/comprAdvHD.htm

 

Thanks That calculator does exactly what I want. I'd also like the equation, if any has it.

Rich Krause



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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

If you're using IE, click "View" and then "Source". The equation is in there, but it's pretty messy and you'll have to do some algebra to clean it up.


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1996 Impala SS - LT4 396, T56
1996 GMC K2500
1992 Buick Roadmaster Estate Wagon