To make it eiser to understand HP maybe this will help, Or complicate the issue......
HP(N) = RPM(N) * TORQUE(N) / 5252
The 5252 is what kieth said,
Torque, how i remember it, A torque wrench. Force.
Torque on a motor is calculated by the bore, stroke, and the PSI, force of the explosion pushing down on the piston, turns the crank. Stroke is the length of the arm on the crank, Or the length of the torque wrench. You pushing on the wrench is the PSI of the explosion pushing on the top of the piston.
another formula just for anyone interested since on the topic.
Bore (in.) ?
Stroke (in.) ?
Cylinder Head Volume (in.) ?
Head Gasket Thickness (in.) ?
Piston- Deck Clearance (in.) ?
Piston Dome Volume (c.c.'s) ?
OR Piston Dish Volume (c.c.'s) ?
Piston DOWN Distance ?
Measured Volume (ml)
CYL.VOL = BORE * BORE * STROKE * .7854 * 16.39
GASKET.VOL = GAS.THK * BORE * BORE * .7854 * 16.39
DECK.VOL = DECK.CLR * BORE * BORE * .7854 * 16.39
TDC.VOL = HEAD.VOL + GASKET.VOL + DECK.VOL + DISH.VOL - DOME.VOL
BDC.VOL = TDC.VOL + CYL.VOL
COMP.RAT = BDC.VOL / TDC.VOL
LET EXP.VOL = BORE * BORE * .785 * DOWN * 16.39
LET EFF.VOL = EXP.VOL - ME.VOL
That is just to get the compression ratio.. ill see if i can find all the other info to calculate more.. If anyone is interested.