Astrin
gentleman rider
Folks, it's hardly a complex formula: power = torque x engine speed. A dyno measures torque as a function of engine speed and the computer multiplies by engine speed to display power as a function of engine speed. That's why the torque curve in ft-lbs always crosses the power curve in bhp at 5200 RPM - that's just how the units work out. So, here's your complex formula in those units:
Power [bhp] = Torque [lbs-ft] x RPM/5200
For example, my K75 delivers 50 lbs-ft at 6250 RPM, so 50x6250/5200 bhp = 60 bhp. However, the torque decreases more slowly than the increase in RPM above 6250 RPM, so the power peaks at higher engine speed, near redline.
Power [bhp] = Torque [lbs-ft] x RPM/5200
For example, my K75 delivers 50 lbs-ft at 6250 RPM, so 50x6250/5200 bhp = 60 bhp. However, the torque decreases more slowly than the increase in RPM above 6250 RPM, so the power peaks at higher engine speed, near redline.
