my understanding may be completely wrong. I bet John and Frank know for sure. But ... at least my understanding is simplistic enough to fit everything from 5hp to 500hp. So here goes ..
Stereo amplifiers can be rated in Peak power or RMS power. Both are accurate and "true" but one rating generates higher numbers than the other. Same with horsepower. You can measure horsepower at crankshaft or you can measure horsepower at prop. Force measured at crank while Johnny measured at prop. I think the magic number is 18% (????). So that a 100HP at prop is equal to 118HP at crank.
ok, thanks for the reply. i had heard that with chrysler that the hoesepower isnt always what you think, like 75hp will be more like 60hp simply because its a chrysler. glad to hear its more or less a myth. thanks again