Actually ... this is the correct formula ... or pretty close ... it is 5252 not 5250 ... HP = RPM x Torque / 5252 and Torque = 5252 x HP / RPM ... This is why on all dyno runs displaying HP and Torque that the two intersect, (are equal), at 5252 RPM ... HP=Torque at 5252 RPM ...... if you have 60 ftlbs of torque at 5252 RPM you are making 60 HP at 5252 RPM ....... Using the examples below a Vmax that makes 78.6 ft lbs of torque at 6000 RPM is making 89.79 HP .. or HP = 6000 (RPM) x 78.6 (Torque) / 5252 = 89.79 .......... Also ... in the example below ... if we are making 106.6 HP at 8000 RPM then we have Torque = 5252 x 106.6 / 8000 (RPM) = 69.98 ft lbs ...... This formula has nothing to do with computing maximum torque or horsepower ... it simply allows a means to compute one from the other at a given RPM ...... campbell ----- Original Message ----- Subject: Re: hp/tq > Hp = (Torque x rpm)/5250 > This is not correct for a combustion engine. > Look at the Dyno run for a Bone Stock bike from > the web site. At approximately 6000 rpm, a maximum > torque of 78.6 ft-lbs are recorded with 90 hp. This is > far below the maximum horsepower reading at over 8000 rpm > where it reads 106.6 hp and the torque at that point is > below 70 ft-lbs. > sniped < ............................................. To unsubscribe go to http://www.sayegh.org/unsubscribe.htm .............................................
