This is absulutely correct. Advertised HP is usually absolute bullsheeet!

I've said this on other forums, but I can't remember if I said it on this thread or forum.
The nitro industry needs to adopt the SAE standards of hp raring along with all of the corrections to adjust for altitude, ambient temp, and humidity. The nitro fuel industry needs to adopt a standardized fuel blend based on the highest quality fuel blend on the market. The nitro engine makers also need to adopt one dyno method. When they advertise hp, they need to also quote at what temp the engine was so we know the hp is actually practical and not produced from an engine that was overleaned for advertising purposes. A complete dyno curve should also be given so we know if the torque curve is nice and broad or a near useless spikey peak.

That would basically squeeze down too many factors into only two factors: engine design and the choice of exhaust. To eliminate one of these two factors, the engine maker can run several tests with different pipes and recommend the best one. Better yet, the engine maker can make a pipe designed and specifically tuned for the engine in question.

If I have missed any other factors, please let me know.

Engine testers from RC mags do their best to quote everthing: fuel used, operating temps at peak hp, full dyno curve, outside conditions, etc. Too bad engine makers do not do the same for their advertised hp!

As far as what Savagecommander says:

"the .70 makes about 2.5 hp @16000 rpm stock, but ive heard with 30% and a modded sleeve you can get more.now before everyone barfs do the math on the power. thats 150+ in-oz. at that rpm... "

150oz-in is tremendous! Big block engines are are lucky to even put out 100oz-in! An ounce-in is very small. 1lbf-ft, the unit of torque advertised for cars, is equal to 192oz-in! So most nitro engines out today make less than half of a pound-foot! 150oz-in is 3 quarters of 1lbf-ft! Thats alot of torque for nitro!