Brake Mean Effective Pressure
BMEP is a function of temperature of the gases in the cylinder and
pressures exerted on the strokes.
Four cycle:...equation

BMEP = ( HP * 13000 ) / ( L * RPM )
HP=horsepower
L = Displacement in Liters
i  forget what the 13000 was.
basically just an efficiency equation.  how efficient is your engine at
a certain horsepower and rpm.
any change you make on an engine will change the numbers.  changes to
the engine will change the horsepower rating and/or the displacement.
jimt
On Thursday, Nov 7, 2002, at 15:57 America/Denver, Chris Mills wrote:

> I think I've got the term correct.
>
> Can anyone define it, is it different from engine to engine (I assume
> it
> is), and can an engine builder change this? What factors affect it?
>
> What is it's consequences? Differences in power, efficiency,
> durability, etc?
>
> Thanks.
> Chris Mills in TN
>