Hi Tom:
Uhh. I think I heard the wings flapping, but that went over my head.
Sorry.
What's "true" pressure?
Best Regards
David
Tom Witt wrote:
>David,
>Since you theoretically would keep everything else the same (including the
>cam) it would prove interesting. As cam duration increases so does the time
>the valve is open. Hence, there is static compression which is a mathematic
>formula of the bore, stroke and combustion chamber (discounting duration,
>overlap etc.) and there is.... well I'm not sure what it is called, but it
>factors in the "real" compression of the fuel/air mixture in relationship to
>the cam. I guess the point I'm getting to is a 12:1 compression ratio may
>result in a significantly higher "true" pressure with a stock cam than the
>"race" cam (with longer duration and typically overlap) general found in
>engines with that type of compression ratio. I would think there is a limit
>(perhaps at the point of diesel!) that relates to compression and cam timing
>(duration, overlap etc.). Basically I'm saying that a 12:1 ratio with a race
>cam may generate similar True pressures to that of a stock cam with a lower
>ratio. So, the bottom line is, "do you even want to go there?" Frankly I
>don't know, but thought that my pose might have some merit worth
>consideration.
>Tom Witt
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