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?
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.
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
--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
From the Cummins Shop Manual
Section E- Engine Identification
Dry, less flywheel and electrical components
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
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
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"