boost presser and power gain

[goflo at pacbell.net]

Attended Captain's mast recently for post concerning pressure drop thru
an
intercooler, when all christians know pressure drop is BECAUSE of
intercooler...
Repeal of gas law was disclosed at that time, for reasons which remind
me of
Zenos' - Are you suggesting otherwise?  :)

Regards, Jack

Greg Hermann wrote:

> Boost pressure is not the significant thing. DENSITY is what you need to
> figure. Mass/hour of air through engine relates directly to HP (or KW)
> output. Density is a function of both manifold absolute pressure and
> manifold absolute temperature, based on PV=nRT or PV= rho k T (gas law) (R,
> k, and  n  and V remain constant for a given gas in a given engine at a
> given speed, so formula simplifies to PV/T=k (rho) (where rho =density) for
> a given engine situation. Sorry this is not too clear, e-mail doesn't do
> subscripts and Greek very well. In British units, Rho=.0762 lbs./cu. ft. at
> standard temperature and pressure, which are 14.69 psia and 69 degrees F
> (same as 528.9 degrees Kelvin (absolute). You should be able to do simple
> ratio calculations based on these numbers and you proposed (or actual)
> manifold pressure and temperature to arrive at you manifold density. Mass
> flow of air through engine is equal to displacement times .5 (for a four
> stroke) times engine speed times manifold density times volumetric
> efficiency. Depending greatly on engine characteristics, particularly
> compression ratio, Each 1 pound per hour of air flow through an engine will
> give in the range of 7 to 8.5 HP of output from a turbocharged engine.