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Originally Posted by squeeforever
Coolhand, I think what it is, is that the small dynos are so rare that they don't have a standard as for what the equivilent to 1HP is. Not sure, but thats what I think. So I guess 1HP might be with a certain load on one dyno, while on another, it might be 1.4HP with that same motor. Just a guess though...
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Close. 1hp is 1hp no matter what. I forget the number off hand, but it's amount of work per time. So is watts. Where the variance comes in is ambient conditions and test methods. An engine w/out an air filter will produce more power than one with. That's where a standard comes in to play similar to SAE standards on real cars. I forget who does the dyno systems for Xtreme (nitrodyne?) but if that became the standard tool and correction factors were developed to "standardize" test conditions then it would be "the standard". Now run it on a different dyno, and true you will get different numbers based on measurement techniques. The engine is producing the same power though.