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There is another sort of basic limit on HP that is you can't get more than 2 HP per cubic inch without a blower or turbo.
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2. 2000/disp per cyl = RPM for peak HP
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Doe! I guess that BMW's been wrong about their 900 HP @ 19000 RPM 3 liter (186 cu in) F1 motor. They've either got a blower hidden in there or their only making 372 HP. Heck the DFV was making 408 HP (2.19 HP/cu in) back in 1967. In 1965 Honda had a 1.5 liter F1 motor that put out 230 HP which works out to 2.47 HP per cu in.
Now looking at your peak HP formula and BMW's F1 engine; 2000/18.6 inches = 107.5 RPM????
Maybe there is a reason that these formulae have been secret - or maybe they're intended only for tractor motors.