[Audi20V_Kruemmer] RE: [s-cars] Question about compression ratios and tuning - More 20vt

[Alex Neckas]

Here is an interesting site that talks about this subject:

http://toyotaperformance.com/pushing.htm

Some good info, some ??? info.  You may want to take the
time to review the "foundation" articles (at the top).

Regards,
Alex Neckas

M Pederson wrote:
> 
> 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
> 
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