EFI for Propane

[Raymond C Drouillard]

Read it again.  My idea is to use the injecter as a valve, and let the
fuel expand to a vapor inside the throttle body.

The pump would pressurize the propane to arount 330 PSI.  This would be
fed into the input side of the injecter.  The output side would be
connected to something similar to a diesel injecter, which is a valve
that opens at a specific pressure.  If it is set to 300 PSI, the injecter
will "see" a pressure differential of 30 PSI, and will be fed with
relatively warm propane.

The valve at the end (a pressure regulater) will be exposed to the cold. 
It will be fed warm liquid, which will vaporize a few millimeters away
from the output.  There will be no water vapor at the valve itself, so
ice shouldn't be a problem.

Since my Holley Pro-Jection system is a throttle body injection system,
injecting the propane right below the throttle body will work well. 
Doing it this way will allow the air and propane to mix well before
reaching the intake valves.

Ray


On Sat, 27 Feb 1999 13:19:26 -0700 Marc Piccioni
<mpiccioni at attcanada.net> writes:
>Have you considered the possibility of have the injectors freezing ? As
the 
>propane expands it removes a lot of heat from the surrounding area, this
is 
>why the propane expansion chamber is always heated with engine coolant.
>
>----------
>From: 	Raymond C Drouillard[SMTP:cosmic.ray at juno.com]
>Sent: 	February 25, 1999 11:57 PM
>To: 	diy_efi at efi332.eng.ohio-state.edu
>Subject: 	Re: EFI for Propane
>
>
>>....What about cooling the lpg to a point where its liquid, then we
>>could use regular efi injectors, we dont have to create a box that must
>>regulate injection time for the variable pressure that temperature
isdoing
>>
>>for lpg fuel pressure.Can a Lucas disc type injector cope with the
pressure?
>>What about two injectors in series?One ontop of the other?
>>I have been thinking of just pumping twostroke oil into the lpg tank to
get a mix.
>>Espen Hilde
>
>I was thinking of feeding the liquid into the injecter at perhaps 330
>PSI, and using something similar to a diesel injecter on the other end
>that opens at 300 PSI.  That way the injecter would see a 30 PSI
>difference in pressures, and be dealing with a warm liquid.  The
standard
>injecter would be used as a valve, and the propane would vaporize once
it
>leaves the injecter (regulater or whatever you want to call it).
>
>I would rather have an injecter that can handle the 300 PSI without such
>a jerry rig, though.
>
>Ray

___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]