Injecting LPG??

[82F100SWB]

Well, I've given up on the V8 idea, and am just going to re-build my 300.
My plans are currently leaning towards using a GM 7730(2.8/3.1L V6, port injected) computer to run an EFI system, and using the DIS system that is commonly found with the computer. However, a bit of brainstorming, and chatting with discokin6 has me pondering injecting LPG. I had planned on running LPG as a primary fuel, with a gasoline backup, so, that mandates an EFI system so that the engine won't be built as a comprimise, but, I still can't quite figure out how to make the computer happy and shut down the injectors at the same time.
While pondering this, Maggo suggested adding a second fuel rail and injectors for LPG. I can easily burn a dual program chip, and, it wouldn't be that hard to switch the injector signals to the second set of injectors.
We were even contemplating injecting the LPG into the runners at the plenum to allow it to cool the charge as it evaporates, possibly even negating the need for a turbocharger with boost levels in the mid teens.

I'm wondering if anyone knows anything about a port injected LPG setup?
I have to maintain the dual fuel ability, I do live 300 miles from anywhere, and running out of fuel would be very bad mojo.
Unless I'm just plain missing something about shutting down the gasoline fuel system, I just can't see how to shut down injectors and keep the computer happy at the same time.
Evan

 

[Asa]

there are those Nitrous/EFI injectors, would it be possible to have the LPG goin into the nitrous injector ?
just a thought

 

[SuperMag]

Would two 'puters work? Just shut off the power to whichever one was not needed?

[edit] Now that I think about it... as far north as you are, aren't you concerned about the propane puddling in the manifold?

 

[Anonymous]

i just bought me a lpi setup , with pump in tank and with lpg injectors ! btw did post some where in a topic al the stuf with pic ! so a complete lpi system , only using lpg no gasoline
, ore secondary feul setup !! stil bizzy with it , but firts the turbo lpg setup with a lpg carb , also no secondary feul setup . only a lpg setup in the car.with this special lpg carb you dont need a comp , but you woil need 1 for the lpi setup .

 

[aussie7mains]

Im afraid to say that at present LPG injection is off the menu, sveral reasons.
1 No approved system is available.
2 Systems in prototype stage had major problems with heating the LPG, vessel could not be filled properly.
3 No propietry fuel inject exists.
So basicly its a mixwe type of thing either dual or single.
BTW Ford down here has both systems available from the factory and they work very well, they up the comp to 10.7 on single fuel and ues the existing EEC 5 setup with appropriate software.
In both case they use a LPG mixer and Vialle brand gas convertors.
If it was me and I had good access to lpg id go single fuel. However you seem to be saying there is good availability (it is here) so then dual is the way to go.
So ues the exist ECU you have with the whole EFI system, add amixer and convertor in the usual way (IMPCO?) and to cut of the fuel, just dissconnect the 12v feed from the injectors, keep the ECU and fuel pump running. This keeps avery thing alive but cuts of the petrol.
If you want to talk more about this just ask.
A7M

 

[82F100SWB]

Basicly, I want to build a straight gas engine, however, I have to maintain the capability to run it on fuel as it will be driven cross country and avalability of propane is always an unknown, and, I know of one stretch of 450K not far from here where there is no fuel avalable whatsoever.
I see this as a viable option due to the fact that I can burn a dual program chip, or just have one for each fuel and swap them out(I'm using a GM 1227730 computer) and this is going to be a turbocharged engine. I can just change the ignition program and lower the boost levels for running on gasoline.
The gasoline and computer bit I have no problem figuring, however, the LPG part fo the setup is where I'm stumped... I've never seen an EFI engine with a LPG setup.

I'm assuming I'll be needing something like this:
http://cgi.ebay.com/ebaymotors/ws/eBayI ... gory=33558

TIA
Evan

 

[Anonymous]

yep nice ,, just what i wil need for my crossflow intake manifold with turbo and lpg setup on a 200 ci head !

 

[Anonymous]

http://users.skynet.be/LPGpiersautogas/03.htm#omschrijving

btw dunno about the US but here in holland lpi is old !!!! now there is sgi and natural gass injection !!
the are complete lpi [ g3] setups to buy here for about 200€
lpi injection with no hp lose ore bad starting ore any problems and the comp is tuneble with a laptop .

got a complete set here now with 80- liter tank [ 5 stage pump in it ] and 6 injectors ! and tuneble comp.
stil waiting for my parts to get from fingers , then i,m of building my lpi setup with turbo . a intercooler wil not needed for a lpi setup they told me .

 

[Anonymous]

The Schwanns truck here run a Liquid LPG injection system..
I Know that these truck are dedicated to a single fuel (LPG) only though

ftwfred

 

[Asa]

i just remembered, there was that one truck that i saw in the area, 30K original miles, it was an LPG/gas hybrid, pretty sure it was one or the other though
was a govt. work truck, had that little road with the leaf symbol on the side...
dunno if that would help at all or not, but it's all i got

 

[Anonymous]

I had a friend who drove a dual fuel LPG-gasoline truck for his company. It was a 1999 dodge ram 4x4. It had a switch under the dash to change it from one to the other. I can't remember the company that made the system off the top of my head though. The LPG did not provide quite as much power as gasoline, the top speed was about 15 mph lower on the LPG.

 

[rickwrench]

Here's a link to an old fanglers digest on the subject (interesting stuff).
http://retro.co.za/efi/DIY_EFI/1999/efi4-136.txt
Rick(wrench)

 

[Anonymous]

"""was a govt. work truck, had that little road with the leaf symbol on the side"""

Those are "Fuel Friendly Vehicles" I think they run on alcohol