Cummins 4bt swap - JeepForum.com

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post #1 of 22 Old 11-03-2010, 07:17 PM Thread Starter
Mudmouse990
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Cummins 4bt swap

im starting to plan a cummins 4bt swap into my 90 yj 2.5l. To me this seems like the best way to go for me. Im gona find a pre 98 engine so i wont have to deal with the computers ill get the thread going as soon i get the ball rolling any input?

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post #2 of 22 Old 11-03-2010, 07:42 PM
youngYJ95
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Hit up 4btswaps.com for any questions they have a lot of jeep builds with the 4bt in them

[Originally posted by rulppa: But no, there is no change is power.. and my arse-dyno is pretty accurate]
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post #3 of 22 Old 11-03-2010, 08:34 PM
Krochus
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With a dry weight of over 700lbs a front axle swap is gonna pretty much be mandatory

Think Green recycle your YJ's sway and trac bars today!

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post #4 of 22 Old 11-04-2010, 04:00 AM
dodger889
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A 4bt does not weigh over 700 lbs try just a little more than 475 lbs Which is about the same as a I6 engine. Now you might be thinking of the cummins 5.9 then you are talking about the 700lbs.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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im just cheap, and cheap makes you creative.
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post #5 of 22 Old 11-04-2010, 05:36 AM
Krochus
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Have you seen a 4bt? Do you google before just guessing at numbers?

It does in fact weigh over 700 minus flywheel. The 5.9 weighs right at a cool grand.

That's why the original 2wd dodge diesel trucks went through front end parts like crazy. I have a 4bt sitting in a breadtruck in my back yard and I don't concider it a feasable canadate for a jeep.

4bt swaps.com FAQ
Quote:
--Not every vehicle was meant to have a 4BT, although almost everyone can fit it I would be concerned with weight. Dry the motor specs in around 750+ lbs, they were notorious for wearing out the P30 Chassis front ends due to weight. So a honda civic is not a good candidate for the swap. Know what your vehicle's front end is rated for weight wise and make the safe decision to beef up components or stay away from me on the road.
Cummins shop manual

Quote:
From the Cummins Shop Manual
Section E- Engine Identification
Page E-5
Engine weight
Dry, less flywheel and electrical components

4B3.9, 679 pounds 4BT3.9, 705 pounds 4BTA3.9, 725 pounds


Think Green recycle your YJ's sway and trac bars today!

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"Jeep Wave threads, it's a newb thing, you wouldn't understand!"
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post #6 of 22 Old 11-04-2010, 07:38 AM
YJay92
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i think it a great idea. there are a lot of jeeps that have done this already. i'm considering this swap myself. i'm going to upgrade my axles to a d60 and 14 bolt. 4btswaps.com is an amazing site. good luck and i'll be watching for your build

1992 YJ, 4.0, auto, HP D30 w/TJ chromolys, 8.8 LSD, 4.10s, AA SYE, Tom Woods shaft, 5" lift, 35" MTZ's, 12k winch, Mark VIII fan, 136 amp alternator, TJ flares, custom snorkel and rock rails, no track bars or sway bar
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post #7 of 22 Old 11-04-2010, 08:04 AM
mdubs
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Quote:
Originally Posted by Krochus View Post
I have a 4bt sitting in a breadtruck in my back yard and I don't concider it a feasable canadate for a jeep.
Does it run? If so, is it for sale?

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Success required considerable profanity.
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post #8 of 22 Old 11-04-2010, 10:13 AM
Krochus
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Quote:
Originally Posted by mdubs View Post
Does it run? If so, is it for sale?
Did wHen parked and no

Think Green recycle your YJ's sway and trac bars today!

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"Jeep Wave threads, it's a newb thing, you wouldn't understand!"
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post #9 of 22 Old 11-04-2010, 10:25 AM
mdubs
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Quote:
Originally Posted by Krochus View Post
Did wHen parked and no
You can't blame me for trying

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Success required considerable profanity.
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post #10 of 22 Old 01-22-2012, 12:51 PM
jeeper1987
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Watching this
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post #11 of 22 Old 01-22-2012, 01:17 PM
WakeDoctor
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^ Keep us updated
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post #12 of 22 Old 01-22-2012, 04:01 PM
SDGBASSE
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Quote:
Originally Posted by WakeDoctor
^ Keep us updated
^^^^Just got that one, Rolf.

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I didn't click the link because it says "power probe" in the url.
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post #13 of 22 Old 01-27-2012, 09:44 AM
fex1221
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I've been toying with the idea myself. I know you have to change out the entire drivetrain to handle the extra torque and then upgrade your front suspension to handle the extra weight. I agree it's not for every vehicle but it's either a 4.0L or a 4bt and the 4bt gets better mileage and from what I understand more torque if you put a twin turbo on it(this info is just from word of mouth by other jeepers that say they've seen both) also it would be pretty cool to roll black smoke in a jeep lol. I'll be watching your thread

Go big or go home.
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post #14 of 22 Old 01-27-2012, 10:10 AM
twiisted71
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Quote:
Originally Posted by fex1221 View Post
I know you have to change out the entire drivetrain to handle the extra torque and then upgrade your front suspension to handle the extra weight.
Actually there are quite a few who just swapped in the 4BT. But I think they were just going for the economy, cool factor, and reliability. I am building mine with those goals plus wanting to be able to off-road it and not be in constant fear of crunching something, so yes its getting the "full meal deal"
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post #15 of 22 Old 01-27-2012, 10:32 AM
jeepwrangler89
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Thinking of the same swap for my 2.5L yj. Keep us posted!
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