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the belt itself is well under 1 horsepower.
one way to measure it is to feel the heat in the belt. The belt "robs" horsepower, and turns it to heat. A serpentine belt is VERY cool to the touch.
If you try to bend the belt into too small of a diamater, it takes more power.
Once upon a time I ran a supercharger I built on a 2 stroke. The engine had an 8 inch diamater pulley, and the supercharger had a 1 inch diameter pulley.
The ultimate speed of the belt is limited by feet per second, not RPM. at 8000 rpm on an 8 inch pulley I was WAAAAAAAAAAAY past the design spec of the belt.
They got HOT very quickly, and blew VERY frequently.
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