Just did the calcs for my CRV 1.5L turbo. At 2000 rpm I get 1173 ft/min piston speed (2 x 3.52 x 2000 x 60/720 = 1173). The original formula was for ft/sec so multiply by 60 sec/min to get final result. This seems to show that 2000 rpm for my engine is "ideal".
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