Propane injection (was Nitrus injectors (was Hydrothermal

[mccabet at mediaone.net]

Raymond C Drouillard wrote:

> I was thinking about injecting it as a liquid.  There would be a lot of
> heat absorbed as the liquid vaporizes.  This would cool down the intake
> air/fuel mixture.  Very likely, the denser mixture would result in more
> power simply because you can stuff more of it into the cylinders.

One question: How would you keep the injectors from freezing?  The
temperature change would cause condensation (frost/ice) to form on the
injector tips.  Now this may not be a problem in a hot engine, but what
about startup?  Another problem, how would you keep the pressure at the
injector constant?  With a working pressure( liquid) of approximately
150 PSI, on a hot day it will be higher, and lower on a cold day.  If
you regulate the liquid to a lower value,  the liquid will convert back
to a vapor in the fuel rail.  

Just some fuel for discussion.  Several engineering grad students have
been trying to answer these questions in the LEV/AFV challenge
contests.  I for one have been contemplating these questions.  

I am no expert in any way, just have experience on LPG conversions.

L8r
-- 
Thomas McCabe
-mccabet at mediaone.net
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