Quote:
Originally Posted by darcane
Actually, it isn't...
Plain and simple, efficiency is a ratio of output to input. Horsepower and torque don't describe a ratio, and thus aren't efficiency ratings. In general, increasing volumetric efficiency will increase horsepower and torque, but that doesn't mean the latter are efficiencies.
BSFC is a measure of efficiency since it is a ratio of output (brake power) to input (fuel consumption).
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Power = work/time, a ratio
Torque = force x moment arm, not a ratio
BSFC = fuel used/torque, if I am not mistaken, a ratio
The word "efficience" is a catch all for everything good in society... and as you suggest it is too often misused.
For us the ratio is Fuel Economy = distance traveled/volume fuel consumed, a ratio
For Craig Vetter the ratio is Economy = $ for fuel/distance traveled...