Quote:
Originally Posted by Rocky1974
Engine output is measured on a dyno.
Dynos measure torque.
Horsepower is then calculated using the formula: Horsepower=TorguexRPM/5252.
Torque is MEASURED.
Horsepower is CALCULATED.
Look at the formula.
When torque is zero, horsepower is zero.
Horsepower owes it's existence to torque.
No torque, no horsepower.
More torque always equals more horsepower.
Below 5252 RPM torque is always more than horsepower.
Above 5252 RPM horsepower is always more than torque.
At 5252 RPM horsepower always equals torque.
Horsepower is just a way of representing high speed torque.
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Horsepower doesn't owe it's existence to torque. Torque is a measure of force, horsepower is a measure of force applied over a given time (power). With a breaker bar or torque wrench, you can easily apply 200 ft-lbs of torque at say 10 rpm (hp=200*10/5252=.4hp), but you would be pretty hard pressed to apply 200 ft-lbs at 5000 rpm (hp=200*5000/5252=190hp).
More torque only equals more horsepower if it occurs at the same rpm.
Also, engine dynos typically measure FORCE via a load cell, then calculate the torque using the appropriate lever arm distance of the dyno (how far the load cell is mounted from the rotational centerline), and then the corresponding horsepower is calculated.
http://www.hhhperformance.com/Articles/HP-Torque.aspx