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Old 11-15-2007, 12:56 AM   #1
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thoughts on putting a diesel motor in a tj

whats up everyone. first post on here but been around cars ALL my life and love to wrench on my jeep. i am not new to BIG mods and have built many custom 4x4's and many race cars. i am good with fabricating parts and do know ALOT about cars so keep that in mind for my question.

this is something that i just cant stop thinking about so i figured i would ask some fellow jeepers oppinions. i have a 2000 tj se. of course it has little 4-banger but it really does put out descent power. the jeep has a 5.5 inch RE LA lift, 35" tires, and d44's front and rear. i do wheel it but i also dd it. now for the delima. the 4c motor has spun a rod bearing. i dont know how it happend and honestly dont care, so dont ask lol. i need to repower it, so i either rebuild the 4c with better internals and see if i can get some more power out of it, put in a 4.0 and stroke it to 4.6, OR i could abandon gas motors and put in a dodge 4bt motor. a 4bt is a 4c cummins turbo diesel motor. it is about the same size as a 4.0 so i know i can make it fit. i think diesel would be good for the torque that it has. the hp is in between the 2.5 and the 4.0 jeep motors but it has a massive amount of torque and would be amazing offroad. it will bolt up to my trans i will just need to use a different clutch.

any thoughts would appreciated.

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Old 11-15-2007, 01:04 AM   #2
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That would be sick! want to do it to mine also?

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Old 11-15-2007, 01:29 AM   #3
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Hit it! But while you're at it, convert it to Bio-diesel. Then fuel will only be $.70 a gal. That would be sick... Can I bolt it up to an auto tranny?
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Old 11-15-2007, 09:31 AM   #4
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go for it....the torque is amazing. so much torque at low RPM's.
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Old 11-15-2007, 09:37 AM   #5
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Arrow My Thoughts...

I'll Tell You What, I Have Always Been A Fan Of It... I Have Been Talking About Doing That To My Girl's Yj For A Long Time Now, That Is If The Motor Ever Went. Last Night Actually, In Dunkin Donuts Parking Lot A Kid Past Me With A Tj With A Diesel, And It Sounded Amazing. By All Means, If You're Considering It, Go For It.
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Old 11-15-2007, 09:44 AM   #6
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The Cummins 4BT is a little tall and heavy for a Wrangler in my opinion but it has been done.
There's some good info in this thread.
http://www.wranglerforum.com/tj-chat...wap-10999.html
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Old 11-15-2007, 09:56 AM   #7
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It should be sweet. Do it and let us know how you made out. You could do some awesome exhaust setups with that.
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Old 11-15-2007, 10:05 AM   #8
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Hit it! But while you're at it, convert it to Bio-diesel. Then fuel will only be $.70 a gal. That would be sick... Can I bolt it up to an auto tranny?
by convert you mean put it in the tank, right? thats all you need to do with newer engines. older engines you just have to change out rubber lines for synthetic.


the diesel swap has been done, and is possible. personally when my 4.0 wears out, or they put a diesel in the JK i'll be driving a diesel wrangler. i have a diesel jetta and with the torque and fuel efficiency i never want to drive a gasser again.

here is a little info, might help you, might be a waste opf time

http://www.offroaders.com/album/show...onversion.html

http://www.jeep2diesel.org/

http://www.dieselpowermag.com/featur...sel/index.html

http://www.turbodieselregister.com/f...-vs-sm465.html

http://www.thedieselgarage.com/forum...play.php?f=156


http://www.thedieselgarage.com/forum...ad.php?t=29065
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Old 11-15-2007, 10:33 AM   #9
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it can be done, there was a really nicely done one in Diesel World a while back. Seen a few with the Libby motors. and with the 4BT get a hold of Scheid Diesel in Terre Haute, and turn that motor up! Watched a 4bt powered Ranger put down well over 300hp on the dyno (forget the torque) He said he was getting in the high 30's in MPG with 35's on it before he turned it up.
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Old 11-15-2007, 01:12 PM   #10
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Just curious, what would you do for the legality/regestration?
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Old 11-15-2007, 01:24 PM   #11
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still just be a jeep I would think. about like dropping a 350 in a CJ-7, or any other motor swap.
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Old 11-15-2007, 02:35 PM   #12
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Just curious, what would you do for the legality/regestration?
you would have to search your states motor vehicle code for that, every state is different.
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Old 11-15-2007, 03:21 PM   #13
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Once you replaced the motor be prepared to swap out the axles. They won't last long with all of that torque
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Old 11-15-2007, 03:31 PM   #14
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Why not just do the 5.9 24valve cummins?


I've been considering this for my YJ also..... but I'm most likely gonna drop a 383 stroker within the next two years...
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Old 11-15-2007, 03:32 PM   #15
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Quote:
Originally Posted by chrometjBEACON View Post
I'll Tell You What, I Have Always Been A Fan Of It... I Have Been Talking About Doing That To My Girl's Yj For A Long Time Now, That Is If The Motor Ever Went. Last Night Actually, In Dunkin Donuts Parking Lot A Kid Past Me With A Tj With A Diesel, And It Sounded Amazing. By All Means, If You're Considering It, Go For It.

Why do you insist on typing so big? It seems that your angry everytime you post something


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Old 11-15-2007, 03:48 PM   #16
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I too want to do this. When the 4.0 is ded.... many many moons from now. I hope to replace it with a diesel
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Old 11-15-2007, 04:18 PM   #17
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I've thought about it! When my motor goes, I'm running diesel. Better mileage, more torque, and you can run alternative fuels if you felt so inclined. It's a great idea! Go for it!
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Old 11-15-2007, 04:37 PM   #18
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It's been done before and anything "Can" be done, but I'd think with most states smog inspections, the wiring nightmare that would be involved and the fact that I'm pretty sure all of the torque that motor will put down to the tires right off the pedal that it would really mess the AX-15 up.
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Old 11-15-2007, 06:48 PM   #19
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Why do you insist on typing so big? It seems that your angry everytime you post something




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Old 11-15-2007, 11:24 PM   #20
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I wonder if the Troller engine would work for a Wrangler? Seems most of the Paris-Dakar rally entrants use diesel, I can't wait to put one in my TJ someday!

http://en.wikipedia.org/wiki/Troller

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Old 11-16-2007, 12:58 AM   #21
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so no one likes the idea of a stroked 4.0?

tobycat1: bio diesel is the main reason i thought of it since i waste so much gas offroad. or i could convert a 2.5 or a 4.0 to propane that would work well too.

skeeter: i agree with you but if i was going to do some hardcore rock crawling with it i would move the whole motor and trans back about 6 inches, down a little bit, and move the rear axle back to get around a 100-105" wheelbase.

Odd is he: believe me if the 6bt would FIT between the firewall and the grill i would stuff it in there but without MAJOR modification, it wont. and it is almost twice as heavy as the 4bt.

1BLKJP: i did think about the trans but if it breaks ill just put the one from my friends ram 2500 that he rolled.

ratzila: i allready addressed that. i have d44 axles from a chevy truck.

i dont want to put a v8 in it because i had a v8 in my cj and wasnt all that impressed with the way it worked out, not to mention the way it drank gas. heck i even put a ls1 in a 93 bmw 325i and raced it, that was an awesome combination.

im open to any other suggestions since im still planing out how it will work. the wiring isnt the problem since the 4bt really only needs power to run, now if i was using a newer diesel that would be a different story.

one more question: what is a good steering box to put in a wrangler to give it a little more umph? i dont think i want to go hydraulic since ill be using it on the road a good bit. iv already eliminated the wranglers sloppy steering configuration and have a solid tie rod with high steer.
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Old 11-16-2007, 01:22 AM   #22
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U might wanna check what quadratec has for steering, but I think gas is just gonna keep raising in price. Diesel gets great mpg, and Bio-diesel is dirt cheap. Plus you cant beat diesel torque.

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