4bt diesel in an xj - JeepForum.com
 
LinkBack Thread Tools
post #1 of 7 Old 01-12-2011, 07:39 AM Thread Starter
thcmyth
Registered User
1998 ZJ 
 
Join Date: Jan 2011
Location: youngstown
Posts: 1
4bt diesel in an xj

i am currently going to school to be a diesel tech and i was thinking i would like to drop a 4bt into my jeep. the ratings for this motor is 150hp with 350 ftlb of torque. i was thinking i might have to upgrade the axels and t-case. i was wondering if anyone had any educated opinions, or comments on this swap. P.s. this motor is a 3.9 and not much different in size then the 4.0L six thats in there

thcmyth is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 01-12-2011, 08:24 AM
cumminsjeep24
Registered User
1997 XJ Cherokee 
 
Join Date: Jul 2008
Location: Hackettstown
Posts: 762
I have seen it done more in wranglers than in cherokees. but I plan on doing this eventually as well but really havent looked into it much yet. I have seen people use an NV4500 for a trans but I dont remember what t case they used. My only concern is length and needing different driveshafts. You will also need to make new motor mounts and strengthen the frame a lot. That motor weighs more than a 4.0 so stiffer coils will need to be used too. As for axles, I would run something like a Ford 8.8 out back and im not sure how a Dana30 would hold up to the power. It would definitely need to be strengthened and not run with bigger sized tires.

97XJ 97TJ 11WK2
KCCO
cumminsjeep24 is offline  
post #3 of 7 Old 01-12-2011, 08:24 AM
440_Magnum
Registered User
1999 XJ Cherokee 
 
Join Date: Jun 2008
Location: Austin Texas
Posts: 839
I know its been done... I've seen it on the internet :-)

Google for 4BT Cherokee and I bet you get some hits. There's also a 4BT forum with pages on transmission options.

http://www.4btswaps.com/forum/index.php

2011 Grand Cherokee Laredo 4x2, 3.6 Pentastar
1999 Cherokee 2door 4x4 5-speed (daughter's)
Two big-block Mopars, Challenger SRT8, and a Ram 1500
2001 Cherokee Sport automatic 4x2 (sold)
440_Magnum is offline  
post #4 of 7 Old 01-12-2011, 08:42 AM
Millermagic
Registered User
2000 XJ Cherokee 
 
Join Date: Apr 2007
Location: Syracuse
Posts: 2,027
Do that in NY and the treehuggers will string you from a tree with your thumbs ... if you are lucky. I wish we could do diesel stuff up here

2000 XJ - 3.5'' Lift & Skinny Mudders.
Previous: A CJ, Few TJs and JK.
Millermagic is offline  
post #5 of 7 Old 01-12-2011, 08:54 AM
XtrailratedJ
Registered User
1996 XJ Cherokee 
 
Join Date: Apr 2008
Location: Tampa, FL
Posts: 951
I am planning on beginning a diesel XJ project within the next 2 months, and am currently getting finances in order to do so. My dilemma has been my need for a DD with very good MPGs. My finished product will be a 1999-2001 XJ, preferrably 4 door, but a 2 door will do. It will be 2WD preferrably a manual, but still researching tranny options. Looking at the Cummins 4BT and the CRD engines. Will fully swap in a WJ leather interior, with full sound system. 2" OME lift with 29" or 30" Dueler Revo AT's on Moab rims. This will not see any dirt at all most likely, as I will be keeping my 4.0L XJ for my trail vehicle.

96 XJ 4.0L/AX15/NP231/AUSSIE'D D30/C8.25/4.5" RE LIFT/33'S/BUMPERS, SLIDERS, ETC...
"I pitty the fool who lists D30's and 31's, then tries to talk **** on PBB":

Originally Posted by Durt_Diver:
Those pics might be a little too flexy for this thread. You don't happen to have any pics of your friends xj on a curb by chance?
XtrailratedJ is offline  
post #6 of 7 Old 01-12-2011, 08:59 AM
Timo_90xj
Web Wheeler
 
Timo_90xj's Avatar
1998 ZJ 
 
Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
Posts: 7,251
Quote:
Originally Posted by thcmyth View Post
i am currently going to school to be a diesel tech and i was thinking i would like to drop a 4bt into my jeep. the ratings for this motor is 150hp with 350 ftlb of torque. i was thinking i might have to upgrade the axels and t-case. i was wondering if anyone had any educated opinions, or comments on this swap. P.s. this motor is a 3.9 and not much different in size then the 4.0L six thats in there
It is absolutely not a good idea to put such a big, heavy, tall, and low-powered lump in a small and light vehicle like an XJ. 4bt is in no way similar in size to the Jeep 4.0 liter engine. 4bt is taller, it's oil pan does not fit too easily with the XJ front axle, it weighs a LOT more than XJ engine, etc. It is doable, and I've seen write-ups and pictures of 4bt swaps on XJs, but IMO you have much better options available. One thing to consider is also the cost of the conversion; will you ever get your money back from the better MPG you get? If you're after torque, just stroke your I6 or do a 350 SBC swap.

4bt is a great engine, but it's not a good idea for the XJ. You would need substantial strengthening of the unibody; you'd need to plate the whole front of the uniframe both outer and inner plating + top and bottom - and it'd be a good idea to use frame stiffeners on the uniframe rails as well. What tranny would you use? What transfer case? Which axles? You can check from Pirate what kind of plating we're talking about from the guys installing 1-tons and 40s.

I've cvompletely rebuilt my XJ front end for the 1-tons + 39.5s, it's doable but requires a lot of work. Considering if you only want the great mileage and torque of diesel engines, it is a LOT of work for the gains you get.

I would recommend diesel engines from the early- to mid 80s Diesel Mercs, they can be built to substantial hp/ torque output, they are very durable engines (one of the strongest/ longest lasting passenger car engines built to date), and the size and weight is much more suitable for XJs than the 4bt. I don't know how easily you can find those engines in the Staes, but I would imagine some do exist. I've seen a build thread in Pirate where someone was doing just that, installing a Merc diesel to an XJ. One other option would be Datsun/Nissan SD33, add a turbo and be done with it. Slightly heavier than XJ I6, but lenght and height is pretty close to same. Not a high HP engine, but huge amounts of torque.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
Timo_90xj is offline  
post #7 of 7 Old 07-14-2011, 10:33 PM
Beowill
Registered User
2004 LJ Wrangler 
 
Join Date: May 2010
Location: Chattanooga
Posts: 472
This is kinda a bump, But within the next year I will most likely be puting a 4bt in my jeep. With:

4bt
NV4500 tranny
Dana 300 or similar Transfer case
Sterling 10.25 rear
Dana 60 front
4:10 gearing
37 inch Humvee tires/Humvee wheels
Frame stiffeners
Probably Exo cage.

I'm excited

Not all those who wander are lost - J.R.R. Tolkien

My LJ Cummins 4BT with 1 Ton's Build: http://www.jeepforum.com/forum/f9/20...ation-2703513/
Beowill is offline  
Reply

Tags
diesel swap , help please

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
6.5L Diesel in an XJ? Chris_Walker XJ Cherokee Technical Forum 45 09-03-2011 07:52 AM
has anybody swaped liberties turbo diesel, or any other diesel. teamskiawa XJ/MJ Cherokee Non-Technical Forum 1 03-24-2010 10:46 AM
diesel fourhwheelin XJ Cherokee Technical Forum 7 04-22-2006 09:33 AM
Diesel anyone?? buddy2003 XJ Cherokee Technical Forum 25 03-24-2006 11:39 PM
Diesel XJ? Jeepin_XJ_101 XJ Cherokee Technical Forum 8 09-05-2005 11:01 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome