I currently have a Renix system I'm getting tired of and am looking at different options. I've thought about Megasquirt, but I just want to stay away from the electronics all together. That leaves carbs

I could put a 258 intake which came with a carb or modify my 4.0l EFI intake to accept a 2100/2150 carb. That would leave me with six holes where the injectors used to be. When I was younger, I remember guys swaping EFI setups to carbs and threading the old injector holes to run nitrous. It worked great!

Do you think I could use the injector bunges to run propane? I'm hoping for a dual fuel setup. Gas for DD and propane when I'm sideways and really off angle. Also I might be building a house in Baja in the next couple years and from what I hear, propane is really cheap in Mexico(so is gas). I'm not looking for a propane carb.

Has anybody seen/ heard of a setup like this or an equivlant?? Maybe a carb spacer plate that injects propane...they make those for nitrous too..TIA

 

search 45 mpg cherokee its a hydrogen jeep maybe you could try this for better gas mileage

 

Yeah, I'm not interested in burning hydrogen, it REALLY $$$ and its under 3,000 PSI instead of propanes 300psi. My reasoning behind this isn't for MPG's, but I'd like to have propane available because carbs flood out when you're climbing a steep hill, going down a steep hill, or when your sideways more than 45*. When things get tricky, switch the propane on, and your good to go for upside down maneuvers. Also like I said, in Mexico, propane is really cheap and available.

Thanks for the lead though, I wasn't sure I was gonna get any responses, the concept is a little out in the boon docks, but thats where I grew up

 

there was apost on here about lpg gas today look that guy up

 

gmv93 is who you need to get in touch with he running lpg gas

 

when we used propane on our old ford it was a carb spacer that the propane went in. so you would probably have to plug the injector holes then get a dual gas set up with a propane inlets.
now the problem with this is mounting the LP tank. they dont want these tank inside the passenger cabin and will cause trouble with the law in there. so unless you have a chop top or plan on making some kind of special carrier for the tank either on the roof making it hard to get to or rear bumper this could be tricky to set up.

our system was set so you could just flip a switch and it changed right over with the tank mounted in the bed. the idea was it was a towing rig and used gas in town and getting up to speed then once at highway speeds you could switch it over and save on gas at 9 MPG it burned alot less LP per miles with the 460 then gas but only at high way speeds as it didnt provide near as much power. worked great in a truck id be interested to see how it works on an XJ without the tank being hard to get to and mounted so it was legal. the only way i see this being legal is maybe mounting it in the bed of a chop top XJ.

 

Thanks

 

That plate sounds perfect! Where do you get one? I've only seen LP carbs, but its good to know the plates exist. Did you install it? Can you recommend any brands or point me in any direction?

I'm not too worried about the legal aspect of it, I'd leave the tank out when I'm in the states and probably only put it in when offroad or in Mexico. Mexican laws are enforced hit and miss. As long as you don't create problems, the policia willn't even notice you, especially if you live there and are familiar with the locals. Where I'm hoping to build is in rural Baja, not Cabo, everyone uses quads and 4X4's to get around, because the roads are dirt, sand and rocks.

 

A propane takes a lot of room and you won;t have the same range as gasoline. You don't use the injectors because when the propane goes from a high pressure to a low pressure it just ices up. You use a mixer at the throttle body to get the fuel in the engine. Propane is nice because it is cheaper than gasoline and burns a lot cleaner, but too many other problems to make it woth it for me.

 

I'm not using the injectors, I'm ditching the entire Renix system for a carb and only using propane for use when wheeling at extreme angles or in areas where propane is cheaper and more available(Mexico) than petrol. The log manifold idea I mentioned would be running(from what I can figure) around 2-4 psi, just enough to move it, but not enough to loose vacuum in the motor.

Right now I think I'm looking for a plate that goes under the carb to spray propane, just like nitrous.

 

i am using dual fuel setup on my 97 ZJ 4.0 laredo. Here in our country, LPG is cheaper than gasoline and it is easy to find. So many stations. On next years, we will switch to CNG for better fuel economy and better performance.

Actually i will take photos of my system and will try to introduce it to you,i will show you how it works. You can ask your questions and i can reply if i know the answer.

Basically there are two types of commercial system, 1. mixer based systems which injects lpg to intake, and 2. sequential sytems which operates like direct injection systems.

for carbureted systems, i suggest you to use very simple "mixer" systems. They are installed under carburetor(or right after air filter box) to mix air with LPG and can be adjusted in very simple way of adjusting a valve on supply hose. Also idle adjustment is done on regulator with a simple screw. There is a diaphragm inside and it adjusts the amount of LPG on demand.

Please check for images.
http://www.google.com/images?client=...ed=0CD4QsAQwAg

 

Simple note here people, if you are not trained in how it works and how to service it....Don't Even Try It. You will lose more than you gain.

 

Thank you! this is EXACTLY what I was looking and hoping for. I would have googled it myself if I knew what to look for! All the duel fuel sytems I could find looked like one carb that ran both fuels. Also I kept reading how the duel fuel carbs where a compromise and made both systems not as good as all petrol or all LPG. The spacer plate looks like it would be completely benign to a carburated system and simple...I love simple!

1. I understand how an "on demand regulator" works, but how is it setup? Is there just linkage that hooks up to the butterfly valve? I'm thinking about how I'm going to incorporate both systems.

2. Also I'm curious how the cooling effect of the regulator affects the motor when your running LPG? Does the hotter burning propane balance it out or does it affect go unnoticed?

3. Can you recommend any brands or places to get the best bang for the buck? Anything to avoid? Maybe cheaper routes that are still %100 safe..like using and regulator off a forklift? When I was younger the forklift we used at a lumber yard was propane and it had an OLD flathead I6. I'm assuming used parts are not recommended, but I have to ask.

4. I think for starters, I'm gonna swap to a 2100 and worry about adding the LPG later, any down sides to this? I'm interested to see how yours is set up and I noticed other people are itchin to see this too.

Thanks again for your input! I'd buy you a couple beers if I could!

 

Oh com'on...at one point in my life I didn't know how a puntang worked either, or how to service it... whether or not I've lost more or gained more since my introduction to the elusive punanny, is a toss-up. Point being, you learn, but its a smelly process..

 

LOL..took me a minute to figure out "lpg mikseri" is turkish for "LPG mixer", just throwing that out there for anybody wondering..