Cummins are almost the same lenght i believe. That would be a sick effin Turbo swap XJ you would be twisting axles for sure!

 

A Cummins won't fit in an XJ. Even the 4Bt is too big an engine. It's entirely too tall and you will not clear the axle. The fabrication required to make it fit is not worth the effort, IMO.

I'm thinking a motor that matches the scale of the XJ. The 2.7L CRD is always an option, but is majorly cost prohibitive, plus, they are fuel sensitive. Whatever I get, I want to be able to run waste motor oil, fuel oil, cooking oil, whatever I can find without worrying about harming the injection system.

 

oh yeah, How about finding a assed out Turbo Diesle Liberty ? That would surly fit but would certainly require alot of wire splicing.

 

Is it just the Depth of the Cummins? One would think tht if you can stuff a SBC into a XJ engine bay you could do so with a cummins or something to that effect.

 

You need to be over on Pirate4x4.com all we do on Jeep forum are budget boosts and throttle body spacers. :rofl:

Seriously though, there are a couple guys on here doing oil burner swaps. Over on Pirate there are alot of questions about cummings but in the quick search I just did I saw several Merc and VW diesel swaps in progress. Hop in their Cherokee section and just search "Diesel".

Here is one guy on JF that popped up in my search on Pirate.
YJ Diesel on JF

 

Thanks I'll head over there. Was trying to keep the info as XJ-specific as possible since dealing with unibody construction is so much different than YJ/TJ body-on-frame stuff.

 

me and a friend were thinking about doing the same thing looked into it and to us it realy wasnt worth all the trouble. but i mean if u do it ull be my hero so go for it.

 

I've seen a few jeep crd and vw tdi swaps on here before. Probably should just search for diesel swap in the xj section.

 

Beside the obvious (possible better gas mileage, longer engine life) Why do you have a need for a diesel? In Cali diesel isn't cheaper than gasoline.

The 4.0l is a great engine.

 

i agree, but as far as i know diesel isn't cheaper anywhere. ever since people realized how much better diesel is they started putting them in bmw;s and crap and now its expensive. sucks.

the 4.0 is enough. i would think with enough torque and the weight of a diesel you would need to plop the xj on a frame...

 

I met a guy at a club function who put a diesel from an old frito lay delivery truck, probably a cummins 4bt, in his commanche. Looked factory, but he put a lot of time in it. I don't know what type of mods he had to do to make it fit. He was pulling hi 20's mpg on the highway with a lift and 33" tires and made his own biodiesel.

 

I'd love to do a Comanche build, but the wife unit will have none of it.

The "ease" of installation in that MJ is likely due to the body-on-frame construction of that platform. That's the good thing about the Comanche, it sits on a frame and presents a lot more option for someone contemplating this sort of swap. With an XJ, you're stuck with little room for improvement, unfortunately.

 

Is it just the Depth of the Cummins? One would think tht if you can stuff a SBC into a XJ engine bay you could do so with a cummins or something to that effect.

The whole set up required for a cummings turbo transmission and transfer case weighs in at around a half ton and is well over six ft long the little xj wouldnt be able to handle it you would have better luck taking a short dodge and putting a xj body on it then swaping drive train

 

wrong, cost of diesel did not go up because of popularity. it went up because the feds saw the need to reduce the ppm of sulfur in the diesel for highway use. costs more to remove, store/process all that extra sulfur. they had some places down here in south louisiana with mountains of sulfur just sitting there because they couldnt do anything with it once they removed it. at least now some of the other chem plants are buying it up and making sulfuric acid with it. sorry for the hijack, previous discussions may resume lol.

 

Plus you may have to deal with emissions and inspection to make it a legal swap, depending on where you live.

And the MJ is just like the XJ with a unibody. No body on frame.

 

Plus you may have to deal with emissions and inspection to make it a legal swap, depending on where you live.

And the MJ is just like the XJ with a unibody. No body on frame.

No inspection here (thanks to the Lord). Indiana doesn't give a crap so long as the tags are current and it's insured.

If it wasn't as rare as hen's teeth, I'd find the diesel that was optional in the '86 XJ. But like I said, hen's teeth...

 

News to me. I thought I read on this very board back when I started here that the MJ was body-on-frame??

 

You must have been looking at the old J-trucks which were a smaller full size pickup. The front of the MJs are the same as XJs the bed is removable though. So, that part is bed-on-frame. lol

Anyway, you should try and find out more about that Mj. He might have a build thread, pictures, or just some good info. It was not lifted 2 ft and on 40's.
Here's a video, looks to be the same one, You can estimate lift and tire size if you want.

 

Back when I was reading about 4bt swaps you needed atleast 3" of lift to clear the oil pan, and fit under the hood, its a tall motor. That manche is not the first to do it, and there are some detailed writeups on it.

 

The more I think about this, the more interested I become in the installation of an '86 Rennault XJ motor. I cannot find a whole lot of info about them, other than they are pretty lean in the power department, but my concerns would be the ability to couple the motor with a 97+ fuel system and with an electronic AW4 transmission. Also, I'd need to install indicator lights for water-in-fuel and wait to start.

I'm curious how involved it will be to trick the computer into going along with the program.

 

I wasn’t talking about the motor or the engine, I was specifically talking about the seats and dash, although that is very interesting and is awesome.