How do Torque and HP differ?

Horsepower is merely a mathematical computation derived FROM torque. Google the number "5252" This number links torque and HP. Dynomometers do NOT measure HP. They compute HP They measure, amoung other things such as instruments for air and temp conditions, engine temp, etc etc........

but the BASICS of a dyno for engine performance is ONLY TWO FACTORS:

torque, and RPM. Period.

HP = Torque x RPM ÷ 5252

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To put this into perspective, then, the RPM factor gives you a chance to compare machines with BIG differences, from say, a huge, low RPM antique "hit miss" engine, to a screaming, 15000 RPM tiny turboed 4 whanger.

You can gear the screamer way way down to produce the same shaft speed as the old "hit miss" and compare the shaft torque output so to speak