RE: Power Output

[Todd Phenneger <phen9461@uidaho.edu>]

Ok, so am I right that 1.8 bar will still be 1.8 bar no matter what temp
is due to wastegate control.  I know in a tire it would change, that is
why on a cold day, the press in tire will change when you hit the track,
but the wastegate will release at 1.8 bar which is always the same, right.

I am a little confused as to whether you are agreeing with me,
disagreeing, or just adding more info.

The way I read your info, I was right that the pressure will still be 1.8
bar but at a higher volume entering the cyl.  Am I right?

On Wed, 1 Apr 1998, Robert Myers wrote:

> Todd,
> 
> The basic equation is PV = nRT.
> 
> n = mass/molewt, so PV = mass*R*t/Molewt
> 
> Density = mass/volume = P*molewt/RT
> 
> The volume of the cylinder (within limits) is fixed.  The molewt is fixed.
> R is a constant.  Therefore the only independent variables are P and T.
> What we want is greater mass of air which allows burning a greater amount
> of fuel which produces more power.  The equation shows the higher pressure
> and lower temperature favor this condition.
> 
> At 05:55 PM 4/1/98 -0800, you wrote:
> >
> >1.8 Bar is 1.8 bar no matter what the temp.  At higher temps, the turbo
> >has to work harder to get 1.8 bar because the barometric pressure of the
> >outside air is lower.
> >
> >I guess the old anology, "which is lighter, one pound of feathers or one
> >pound of lead".  Well, neither, they are both one pound.   But the pound
> >of feathers will take up WAY more space.
> >
> >That make sense?  I am not the say all, know all, so I may be off a little
> >on this but if my Flight lessens taught me anything about the way air
> >works, I should be right.  
> >
> >I think that the volume of air might be different though.  Hence, people
> >use intercoolers to force more air in.  Cools the air, makes it more
> >dense, so more enters engine but at same pressure.  That might be the
> >power difference you are feeling.  I know airplanes have huge differences
> >in top speed and climb rate at higher temperatures.  Cool mornings or
> >winter is the best time to fly an underpowered plane.  Much smotter to
> >BTW.
> >
> >	Anyhow, hope that was of help.  L8R
> 
> ___
>    Bob
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