I agree that the best way to find the best curve for any given engine is a dyno
My suggested curve was a starting point and "safe" - you won't burn piston crowns at partial load
a curve that continues to rise to 5000 rpm seems excessive with modern fuel but YMMV
English fuel in period (1946-1951 or so) was very poor - octane 70-72 (and even poorer in some european countries) - hence the 7.5:1 CR initially.
any modern fuel exceeds that level of anti-knock
Regards
Julian
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