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The point of the whole argument is what do dyno's measure, they can't measure power as power is only a calculation based on what is actually measured, which is torque. There is a thread on LS1 that explains it better.
Whatever applies the force is irrelevant as the dyno can't actually quantify it, it can only measure the torque required to spin the rollers.
No dynos measure torque and RPM. Torque on its own would not move a car very far or fast at all. Engines produce power but a dyno does not measure power, yes power has to be calculated but the engine is still producing it or your motor would spin for a few seconds then stop. I hope that made sense lol.
Nobody is arguing that an engine doesn't produce power, the argument is, or my argument is, the power isn't MEASURED, it's calculated by a formula.