The Power and Torque curves always cross at 5252rpm on any internal combustion engine.
So i am wondering if it's a good idea to be trying to change the throttle blade setup so they open more below 5250rpm.
I don't know if it's related to any power limitations that yamaha might seek to put on their bikes just kinda interesting to me that throttle blade operation and the power and torque curve number seem to have alot in common.
5250rpm 60-80% throttle blade opening
5252rpm power & torque curves cross.
Horsepower = (Torque * RPM)/5252
Why?
It's important to understand that nobody on the planet ever actually measures horsepower from a running engine. What we actually measure (on a dynomometer) is torque, expressed in foot pounds (in the U.S.), and then we *calculate* actual horsepower by converting the twisting force of torque into the work units of horsepower.
Visualize a one pound weight, one foot from the fulcrum on a weightless bar. If we rotate that weight for one full revolution against a one pound resistance, we have moved it a total of 6.2832 feet (Pi * a two foot circle), and, incidently, we have done 6.2832 foot pounds of work.
Remember Watt? He said that 33,000 foot pounds of work per minute was equivalent to one horsepower. If we divide the 6.2832 foot pounds of work we've done per revolution of that weight into 33,000 foot pounds, we come up with the fact that one foot pound of torque at 5252 rpm is equal to 33,000 foot pounds per minute of work, and is the equivalent of one horsepower. If we only move that weight at the rate of 2626 rpm, it's the equivalent of 1/2 horsepower (16,500 foot pounds per minute), and so on. Therefore, the formula applies for calculating horsepower from a torque measurement.
Found them They must be good
