Quote:
Originally Posted by P-hack
efficient when discussing an engine can surely be assumed to mean bsfc(well, around here anyway). power to weight can play a role in system efficiency, esp in a vehicle, but an engine by itself cannot go anywhere. The smaller the engine the worse it is at turning fuel into horsepower, typically.
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Don't forget extra friction losses due to high RPM. Not to mention I would need at least one extra gear box to convert RPM based horsepower to torque, and I am already geared higher than I like with an engine that can chug along at 500 RPM.