propane injection

[Doug Engel]

Haven't climbed hills of any significance, but it does help pulling grades. I
notice that I can back out of the throttle some (fuel flow light goes out) and
maintain speed. I tried several orifice sizes but ultimately just drilled the
darn thing out to about a 1/8" and regulate it with the regulator. I think that
a person could run more than I currently have it set (higher RPM= ability to use
more propane), but then you would be using more than optimum if you are just
going down the road, I'm trying to find a happy medium. Like I said, it's not
earth shattering, but any noticeable difference in a 23,000# vehicle must be a
significant HP increase.
Doug n' Pokey

davidkerryedwards wrote:
Notice any difference in hill climbing ability? (not-so-pokey?) What
size orfice are you using? I suppose a person could experiment with
a one pound propane bottle, regulator and a little hose.
I know overfueling (or underairing) significantly increases EGT's on
my NA with an aftermarket turbo so I'm curious about the propane.
Anyone know anything about propane injection and altitude
differences?

Kerry
82 FC 35
Denver

--- In WanderlodgeForum@yahoogroups.com, Doug Engel
wrote:
>
> Pokey is NA and I do not run an EGT, so I can't answer that. I
tapped into the house propane tank, ran it unregulated into a
propane regulator and then into a soleniod valve, from there it runs
thru copper tubing and into the top of the air cleaner. I had to
fiddle with orifice size and pressure, but am running it at ablut 5
PSI. Since the regulator contriols flow, the initial problem I had
wa too small an orifice, I don't think you can go too big. I have a
switch on the dash and flip it on at highway speeds or when
accelerating, ususally not under 2000 RPM. The difference is subtle,
but very apparent. It runs smoother, takes fuel and accelerates
better.
> After talking to a chemist friend (who lost me but understood
what I had done), he said it has someting to do with a shorter
carbon chain in propane compared to diesel. The introduction of
propane into the fuel/air mixture allows the diesel to start to burn
at a lower temp/sooner and burn more completely. What I understand
is that it should not adversely affect the EGT or engine as a whole
in any way, at least not at the level I run it. In fact at idle, if
I turn it on, the engine actually seems to miss, so there is some
point at which the addition of propane will offset the air/fuel
mixture in a negative way, so there does not seem to be any chance
of a "runaway" situation.
> I still have to fiddle with the "right" amout. At highway
speeds, you can reach a point where I think you not gaining
anything, just using more and pumping it out the tailpipe.
> Doug n' Pokey






Doug Engel, Gunnison, CO. 1981 FC35SB "Pokey"

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