I have read and agree also about the Dyno Jet deal. Since HP is a derived/computed number to a "standard" that was first used in the cowboy days, what does any of that matter? If the industry standard is the Dyno Jet, and all dynos relate in some way to cowboy/ "average" horse, none of how we got here matters. We are here, and use what has come before us to come up with easily comparable numbers.
If there are any (and I'm sure there are) gun guys here, the stupidest contrived "standard" is bullet energy. It factors in gravity to the energy formula! Really! If you measure the energy from 10ft. in front of the barrel how far has the bullet "dropped?" How much work has gravity done? Since on any distance shot you have to aim high to offset the bullet drop, isn't gravity working against you in the uphill part of the bullets arc? The lbs/ft bullet energy thing is entirely stupid on its first look. At the published numbers even a .357 should knock down even a reasonably sized shooter with recoil. A proper way to estimate bullet energy would be to have a suspended one pound weight from a nearly frictionless pivot, with a linear scale behind it and use a high speed camera to see how far the one pound weight moved. In a totally inelastic collision and near frictionless pivot, ft.lbs can be read off of how far the weight moved. I've tried this many times through the years and the accepted standard is waaaay off. But it is the standard and has been for many, many years, so it is what we use. Same deal. It doesn't matter how we measure, as long as we all use the same standard.
Sorry for the long winded explanation, but I hope it sheds some light on the situation at hand.
Bottom line: only Dyno Jet numbers are relevant to other Dyno Jet numbers. Super Flow numbers are different and should be only referenced to other Super Flow numbers.
Pat Hale came up with the Quarter Junior dragstrip program about 30 years ago to predict quarter mile ET and MPH from dyno numbers. It was very accurate when I had an engine and chassis dyno for cars. I can't use it any more because my copy is on a "floppy disc"!!!! I believe he had a bike version too, but have never used it. The dragstrip doesn't lie. HP can be computed from ET and MPH numbers because you have a known weight that you moved a known distance in a known time. ET can be easily changed by gearing, clutch drop RPM, and shift points, while Trap speed is more of a Horsepower indicator, assuming constant co-efficient of drag (don't sit up on one pass and crouch on the next).
Again, sorry about the length of the post. Knowledge is power. TIMINATOR
