[Diy_efi] LPG injection

[Grant Beaty]

BTU / gal:
Ethanol: 84,100
Methanol: 64,250
Propane: 91,300

The alcohols are 50% denser than propane in liquid form. How much volume
does expanded propane take up in a cylinder?

Grant

----- Original Message -----
From: "Derek" <derek_obanion at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, November 21, 2002 11:48 PM
Subject: Re: [Diy_efi] LPG injection


> "Simply evaporates." You are aware the latent heat of vaporization of
methanol
> is 3340 BTU/gal? That's a LOT of heat getting taken out of the air. Guess
what
> propane's is.....only 775. You also will use much less gal/min of propane,
as it
> does have 243% as much horsepower per gallon. Not a problem with methanol,
just
> spray more. So let's say you are injecting 200HP worth of fuel (propane or
> methanol) on top of your gasoline.
>
> You will get (3340/775)*2.43=10.47 times as much charge air cooling with
> methanol
>
> Do the math before making assumptions.
>
> Direct LPG into the ports is nice, good high octane fueling suppliment.
But if
> you are going for charge air cooling, propane isn't your choice.
>
> I DO get those temps. I can make up a graph from one of my logs if you
like.
>
> > <cough> I really doubt it, LPG goes from compressed liquid
> > to a gas - mthanol simply evaporates, the discussion is about
> > direct LPG injection into the ports...
> >
> > rgds
> >
> > mike
> >
> > At 03:35 PM 18/11/2002 -0800, you wrote:
> > >LPG gas cools very little. Methanol will be 10x better for charge air
> > cooling. I
> > >should know, I get intake temps lower than 20F on a 70F at 30psi of
boost.
>
>
>
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