Re: [Amc-list] Re; Interesting Water Injection for DIY

[Tom Jennings <tomj@xxxxxxx>]

On Thursday 02 August 2007 14:32:26 dan whitehead wrote:\
> Tom, if I read this wrong then I appoligize.  Turbochargers don't turn
> "waste" exhaust heat energy into intake air.  The velocity of the exhaust
> exiting the engine turns the turbine side of the turbocharger.  

No offense taken, and none meant! :-)

The energy in exhaust gas IS heat energy, and it manifests as high-velocity, 
high-pressure gas -- only because of the heat.

Read any turbo book -- turbo efficiency is best when the turbo is closest to 
the valves because that's where all the heat is. Every inch you go downstream 
the exhaust radiates heat energy into the air, lost for ever. That heat comes 
from gasoline combustion, if you don't use it you lose it.

If you stuck a probe into your exhaust system at various places, you'd see 
velocity and pressure drop the further you got from the combustion chamber. 
Simple as that. Why? The heat radiates out and heats the air under the car, 
lost forever.

All combustion engines -- internal or external -- are heat engines. 


> The 
> impeller side (totally seperate from the turbine) compresses the intake
> charge "forcing" more air/fuel mixture into the combustion chamber.  The
> turbo heat is from the exhaust turning the turbine.  Remember, it's all
> atmospheric pressure that fills the combustion chamber and the pressure of
> the burnt gasses exiting the chamber.  A supercharger just "forces" more
> fuel charge into the chamber.
>
> Dan Whitehead
>
> >If I recall correctly it was big in WWII aircraft, but combustion science
> >and turbocharging mainly did it in; turbochargers turn "waste" exhaust
> > heat energy into intake air which is a huge help at high altitudes
> > obviously.
> >
> >ALso water injection was big back in the days when ignition timing was not
> >very well controlled, usually retarded, and compressions were really low.
> > I would suspect that today, short of well-timed direct cylinder water
> > injection, that a lot of ignition timing work would do better than the
> > water -- on a modern (1960's+) motor.
>
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