Does that mean I shouldn't be excited about having 200-210 across the
board in my TR6 engine in my GT6? And that is when it is warm...
Well, at long as it runs great...
Michael
2 GT6's and 1 TR6 - all keeping me poor
On Mon, 14 Oct 1996, Doug Mitchell wrote:
> On Oct 14, 9:28am, SCHWANGAU@aol.com wrote:
> > Subject: Re: Compression Tests--real world
> > Why don't the numbers work for my application? I am measuring 180 psi on a
> > 9.6 to 1 motor, and a 150 on a 7.5 to one motor. There must be some other
> > factor we are not considering. Inertia? Chamber shape? Latitude? Left
> > Coast?
> >
> > Brian N.
> >
> > 65 Spitfire 9.6 cr
> > 79 Spitfire 7.5 cr
> > (California)
> >
> >-- End of excerpt from SCHWANGAU@aol.com
>
>
> Brian and others,
>
> I just talked to a friend of mine who works in engines, and he tells me
> that you *cannot* calculate the compression ratio from the measured
> compression. He further states that you *cannot* accurately predict
> compression from the known (or idealized) compression ratio.
>
> One of the variables affecting the compression is valve timing. As the
> intake valve opens later and later, compression will drop.
>
> Doug Mitchell
> dmitchel@ford.com
> dmitchel@ismi.net
>
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