MrForgetable

I figure the UTH guys would know best

I am looking for several mathematical equations that engine builders use to help them develop maximum efficiency, more power, more balance, stronger internals, etc. Something such as calculating horsepower from the RPM and the torque number (H=TxRPM/5252) would work. Any help would be greatly appreciated Thanks.

George

CoralDoc

The most important equation in this regard is:

$$ + time = engine power

mxt_77

Go to your local university bookstore and pick up a couple of books on physics, dynamics (fluid-, aero-, thermo-) and mechanical engineering. Every equation you'll need to know should be in there.

I doubt there are going to be a handful of Magic Equations that will give you the answers you seek.

beroznikmal

Try these books..... It should give u a good idea.....

http://www.amazon.com/exec/obidos/search-h...4295842-8160751

dhayner

One basic equation that gives some insight into where horsepower comes from is:

HP=P*L*A*N/63025

where:

P=mean effective pressure, psi
L=length of stroke, ft
A=area of piston tops (total), sq in
N=number of power strokes per minute (rpm/2 for a 4-stroke)
63025=a constant to account for the definition of horsepower (33,000 ft lb of work per minute)

So, the ingredients of horsepower are cylinder filling and compression ratio, displacement, and rpm. Then you have to take away losses due to friction, back pressure, etc.