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Rearanging that formula to output RPM...
(720 * Piston speed) / 2 * Stroke in inches = RPM
Honda Civic 1.8L stroke = 87.3mm = 3.437
Ideal piston speed (for most engines) = 16.4 to 19.8 ft/s
Solving...
@ 16.4 ft/s, RPM = 1718 = 39.3 mph
@ 19.8 ft/s, RPM = 2074 = 47.4 mph
These numbers coincide with my high (successful) FE attempts. Now I just need to find that darn BSFC chart for the R18A... *sigh*
p.s.: Someone with a diesel engine shout out their speeds at a given RPM - then we can figure out why diesels can run so slow and still get their awesome FE. Logic would dictate a longer stroke than gasoline engines to stay within the "best" piston speed range.
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