Vizard in his "bible" for tuning the A-series engine includes a section
for calculating CR based on available octane gasoline, cam duration,
etc. For 93 octane gas and a hi-po street engine my recollection is the
CR was about 9.2-9.8 (depending on specific set-up).
David Anton in the APT web-site recommends no higher than 9.5-1 CR for
street car on pump gas.
Jim Rogers
San Juan Capistrano, CA
> Jackson Zimmermann wrote:
>
> > With current 93 octane gas and Cooper S sized valves, approximately > what
>CR is realistic?
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