Reply #62: BSFC maps are great references when you can find one [View All]

[NoGOPZone]

and if you can find one with HP curves overlaid, even better. I have to disagree on one point, most of the ones of seen for gasoline engines peak at slightly less than full throttle, around 80%-90%. What's also interesting is that the horsepower hour unit comes because one divides the rate of fuel consumption, that is mass per time, by the power produced, resulting in the time unit, in this case hours, becoming part of the denominator.