Aftercooler Gains

[Tom Sharpe]

Just a thought, but if you make it run without intercooling, MPG will be higher
because more fuel can be vaporized with hot air. Max HP of course, will be less
than optimum, but still, you can generate some really big numbers. I prefer
simple intercooling on demand, i.e.. water injection controlled by boost
pressure. If you have really good combustion chambers and fair gas (and boost
retard), detonation should not be a problem until things really get out of hand.
Ol' Smoky U had a twin turbo 2.5 L fiero with a large turbo feeding a smaller
turbo (not staged) just to heat and pressurize the inlet air to around 400 deg F
if my memory serves me.  Great mileage, but 10K exhaust valve life.  Of course,
if you are trying for a land speed record, this does not apply.  Tom

> Subject: Re: Aftercooler Gains
>
> >
> >By the way, does anyone have any real AC compressor figures to examine, at
> a
> >variety of full load shaft speeds?
>
> Yeah, but it would prolly go over the limit for a post! Compressor HP will
> vary with suction pressure, condensing temp/pressure, compressor
> displacement, and compressor speed. At "normal" AC conditions, say 35
> degree suction temp and 135 degree condensing temp, you can figure ROUGHLY
> 1 HP compressor power per 12,000 BTUH of cooling effect. With higher
> suction temps, a given displacement/rpm compressor will have a higher
> "capacity" and pull more HP to drive it--because the refrigerant gas will
> be more dense at the higher suction temp.
>
> There are LOTS of variables!
>
> Perhaps the numbers for a 200 HP compressor at 0 F suction and 110 F
> condensing at 1200 rpm,using NH3 refrigerant would be of interest?? :-)
>
> That 20 HP number wasn't too unrealistic for the conditions and load
> mentioned!
>
> Greg
> >
> >Your math is probably correct, don't rely upon mine at this point.
>
> See my prio post about the math--it wasn't.
> >
> >Since you appear well adept with thermo crunching, what do you specifically
> >think of the air/dynalene/freon hybrid intercooling system found at
> >www.coolflow.com?  Would be very interested in hearing your thoughts.
> >
> >
> >Thanks;
> >Walt.
> >
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