How Gearing Effects HP from 1-3rd in 727's

70DusterBob said
Thank you for this rather accurate and "What I was Looking For" reply. The HP and Torque increased approximately 35%, so based on what you just said, is it safe to assume that there is a 35% increase in Engine HP and Torque as well at whatever the gear is. Right?

I think a 35% increase for a non-moving part, that bolts under the carb is pretty much good enough for me to find someone interested in it. I am making tweaks to the designs, but like you said, I'm not looking for a 1hp increase, I am jumping 10% 20% and 35% with my design variations. I think this chassis dyno should suffice. Thanks a million!

Bob

No way on this flat earth do you eat up 35% of your power through the drive train. No borking way. I can tell you most sticks eat 17-18%, while some if using a OD will be about 20%. An automatic, starts at about 20-21% and goes up from there.

If you actually want to know exact engine HP from a chassis dyno, you need an operator who knows how to use his dyno. Then make your test pulls in your 1:1 gear. Then do a coast down to calculate drive train losses. It damn sure won't be 35%.