EFI for Propane

[Raymond C Drouillard]

I have given it considerable thought, and have even done some
calculations.  Go with experience rather then theory, thoug :-)

There is a site in Oz that describes such a system.  There is a pump
inside the tank that pressurizes the LPG to about 300 PSI.  This keeps it
from boiling prematurely.  It is injected as a liquid.  I believe that it
is injected right outside the intake valve.  There is a secondary ECM
that translates the stock ECM's injection signal to something suitable
for propane.  They claim a 10% improvement in both torque and power over
gasoline, and they have the dyno data to back it up.

My plan is to mount injecters on my Holley Pro-Jection throttle body, or
through the spacer plate under it.  I'll just set up a seperate fuel and
spark advance table for propane.  That'll be proof of concept. 
Eventually, I will build an engine to take advantage of the high octane
of propane.

I never got around to sending mail to the people who are building these
systems.  I need to find out where to get the injecters and the in-tank
pump.  I'll probablly control the pressure with a chopper circuit feedint
the pump motor.

I still need some numbers for my calculations, such as the specific heat
capacity for air and for gaseous propane.

Ray



On Fri, 26 Feb 1999 16:48:07 EST ScottyCBoy at aol.com writes:
>I've got a question or two:
>
>Has anyone though about or attempted designind an EFI system for
>Propane/Butane fuel. I would think that liquid propane entering an
intake
>manifold at 300 PSI at -80 degrees or whatever it boils at would do
wonders to
>lower intake temps, plus with a stoich ratio nearing that of Gasoline
and an
>Ocatne rating of 130 seems like it would be an ideal fuel for super high
>performance turbo charged engines.. Not to mention the fact that all
those EPA
>CARB guys would love Propane's low emmision exhaust gasses. Has anyone
found
>an electronic fuel injector capable of withstanding the high pressures
and low
>temperatures for such a setup? 
>
>Thanks!
>
>Scotty
>

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