why humid is better!

[John Lamb]

Exactly,
Simple psychrometrics
JL

Roger Heflin wrote:
> 
> ae2598 at wayne.edu wrote:
> >
> > I think the bottom line is you're cooling the combustion chambers.  It's
> > the latent heat of fusion, or something like that :)
> >
> > Isn't that why people inject water into the intake?  Or, in the past how a
> > "power" A/F mixture was considered to be a rich mixture?
> >
> 
> No, water vapor is already vaporized it has no latent heat of fusion,
> and is in no way shape or form the same as injecting liquid water into
> the intake.
> 
> Injecting water in the intake will result in the water being vaporised
> in the intake, but this will also result in the overall charge being
> cooled which is a good thing, humidity won't do this because it is
> already vaporized.   And water vapor in the air (humidity) also
> displaces air (pressure stays constant), and the water vapor has
> no useable oxygen.
> 
>                                 Roger
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