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But the torque is not 0.  See what I mean?  Torque is a measurable thing- HP is a calculation. 


I'm with you on it all being calculated- but what is the "root" of what is being calculated?  Strain gauges are being used to measure the amount a piece of metal is being bent by the engine on the dyno stand.   They are calculating the torque put into that bar, because that is what is being produced.  Everything else is calculated using that torque number and the RPMs of the engine.


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