Re: LPG in cars

[farna@xxxxxxx]

Okay, I know this is obvious to you Tom, and anyone else who knows anyting about LPG/CNG, but I'll say it anyway: Yours just changes from liquid to vapor in the carb. Probably more efficient that way, and the tanks wouldn't ice up. I'd actually think that feeding vapor would be much easier since there is vapor in the tank and the engine needs vapor. Not more efficient like your relatively sophisticated system (it has a computer), but cheap and easy. The only problem would be what Jim described: pressure dropping in the tank and not pushing the vapor forward. At least it wasn't cold already when he ran low, otherwise he'd have been stuck! Seems like I remember some of the early systems feeding vapor. One of my brother's friends drove a propane delivery truck that also burned the stuff. I recall him talking about  switching over to a newer system that was supposed to be much more efficient than the old one. Talk about range, stick a 1,000 gallon tank on the back! 


On May 9, 2005 Tom Jennings wrote:

> On Mon, 9 May 2005, Jim Blair wrote:
> 
> > A: Auto fuel injection systems with LPG use liquid that is pumped to the
> > front. The older carb mixers on dual fuel use vapor from the tank (which is
> > why the tanks ice up, even on sunny days on long hill climbs), and I had a
> > BBQ tank for backup on long trips with a manual switchover valve. I could
> > always tell I was near running out about 50 miles before it did because the
> > car's power would nosedive as it reached the end. One time I ran out of even
> > my backup tank, but I let it sit a couple hours till it warmed up outside
> > and got just enough vapor to slow cruise the last mile to the station! (I
> > had a 600 mile range with my slant 6 and somehow I forgot to write the
> > mileage down from the previous fillup)
> 
> Wow, never heard of vapor-fed motors! That sounds very kludgey.
> My car is dead-ordinary: liquid to the engine compartment, through
> the filter/shutoff, to the converter, which is a coolant-heated
> two-stage converter that outputs -0.5" water column LP gas, via 1"
> hose to the carb.
> 
> 
> 
> 
> 
> 
> >
> >
> > From: Tom Jennings <tomj@xxxxxxx>
> > To: mail@xxxxxxxxxxxx
> > Subject: Re: LPG in cars
> > Message-ID: <20050509002108.H10273@localhost>
> >
> > On Sun, 8 May 2005 mail@xxxxxxxxxxxx wrote:
> >
> >> Saw a post on using LPG in cars, and there are many
> >> advantages to it. The main dis advantage is where to
> >> fill up. Can't you just fill up at home? There is a
> >> company that has produced a home filling station that
> >> basically just lowers the pressure coming out of the
> >> home line. Couldn't you just set up a "T" and use that
> >> to hook up your filling station.....Russ
> >
> > Nahh, it's gotta be pumped into the car tank. The reason is that
> > when you connect two tanks together, fuel will flow from the
> > fuller one to the emptier one only until the pressure equalizes.
> >
> > Plus home (propane, not natural gas) tanks dispense gas, and auto
> > systems dispense liquid. For BBQs and stoves gas it picked off the
> > top of the tank, for LP car systems liquid is taken off the bottom
> > of the tank.
> >
> > Think of it as a sealed tank filled with boiling liquid; off the
> > top is steam (gas) at the bottom is liquid. In fact this is almost
> > exactly what's going on with LP -- it boils to "steam" (LP gas) at
> > -22F.
> >
> >
> > (You can make a "gas can" for LP cars with a 5-gallon BBQ can with
> > the internal safety valve removed; with a special double-ended
> > hose (1-3/4" acme to POL) you connect a TOTALLY FULL 5-gal can to
> > a TOTALLY EMPTY car tank, tip the 5-gal upside down, then open the
> > valve.  About 4 of the 4.5 gallons the can will fill the big empty
> > tank, at which time the pressures equalize.
> >
> > (New BBQ cans have a safety valve that prevents overfilling and
> > also prevents dispensing liquid when turned upside down. It's a
> >
> > good idea, except for use as a gas can :-)
> >
> 
> >
> 
> 
> 
> .


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