How does a Dyno Really Work?

RustyRatRod said
I get that. Not what I'm talking about.

What I'm trying to get through is, a dyno cannot measure HP. PERIOD. End of discussion. It MUST have a torque spec in order to "figure" HP. Torque is the DIRECT measurement and THEN the dyno "figures" HP based on torque.

Now, if you're talking about a horse pulling weight X amount of distance then that's a horse of a different color. That IS a direct measurement of HP, but a dyno cannot do THAT. It MUST see torque FIRST.

I get what your saying dyno doesn't measure hp directly, only rpm and torque (which is power) which you have to calculate hp, but don't understand why that's a big deal, you know how many things can't be measured directly? But we still know about them and how them works, we calculate watts by reading volts and amps.