[s-cars] Question about compression ratios and tuning - More 20vt

[M Pederson]

For tuning purposes, isn't your static CR some what irrelevant?
You are going to be more affected by the dynamic compression ratio's which
as I understand, are substantially affected by cam profiles (granted this is
probably a pretty fixed constant in most of the motors you will see) and
volumetric efficiency which while one might assume would be fairly constant
and consistent from factory conditioned motor to motor, might begin to vary
more than a little in motors with rebuilt heads and valve jobs of varying
skill and quality.  

On a running motor, it sounds to me like you would be tuning for optimal
timing based on the motors dynamic, not static compression ratio.

Mike

> -----Original Message-----
> From: Mihnea Cotet [mailto:mik at info.fundp.ac.be]
> 
> Nope, ADU is 9:1, I can't remember where I've read it but I'm sure it has.
> My previous example of an ABY running everything ADU except for the head
> gasket and having to run a few degrees less timing advance is
> self-speaking, I've BTDT several times, on ABYs and AANs.
> 
> HTH,
> 
> Mihnea