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Unread 09-13-2013, 12:19 AM   #1
DirtRider1357
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4bt swap

so next summer im thinking of swapping a 4bt into my 05 lj rubi, 6 speed, 35's. from what ive been reading to physically bolt the motor in i will need motor mounts and trans adaper. im currently running a 4 inch suspension lift and a 1.25 inch body lift. id like to keep all the stock gauges working so id keep the computer in. and for the tach id use either the hesco adapter or something else. im also planning on putting a larger radiator and efan, frame brace under the engine bay, using a cut down center exit 6bt exhaust manifold.

what else is needed to do the swap and how do i find out what gearing i would need (or if stock 4.10 is okay)? thanks

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87 YJ, 4.0L, 5speed......sold, 05 LJ Rubicon
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Unread 09-13-2013, 04:09 AM   #2
rda616
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You will need to weld new mounts to the frame. You will need to bypass the fuel pump in the tank. You will need a new transmission to mount the 4bt. The 4bt is also very heavy at almost 800# vs the 500# you have up front now.

I like diesel engine in a truck, but would not do one in a jeep. You will never get your investment back and most modern v8's weigh far less while offering comparable fuel mileage and plenty of torque.
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Unread 09-13-2013, 04:19 AM   #3
Bigdude408
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http://jdjeeps.com/

this might be close to you.
pulling up at the other pump when your filling up would be almost worth it. im seriously thinking about this swap too, a lj would be a better platform to start on though!
did you find a crate motor? if u build i will follow your build thread closly!
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Unread 09-13-2013, 07:45 AM   #4
DirtRider1357
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I will mostly likely find a used motor from a bread truck. I was reading about a guy on 4btswaps that kept his nsg370. Still have a lot of research, planning, and saving to go though
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87 YJ, 4.0L, 5speed......sold, 05 LJ Rubicon
"It'll buff out"
"If it moves and shouldn't, use Duct Tape & Zip Ties. If it doesn't move and should, use WD-40 & A hammer"
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Unread 09-13-2013, 08:00 AM   #5
Ironhead
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Quote:
Originally Posted by DirtRider1357 View Post
Still have a lot of research, planning, and saving to go though
I was in the same spot, and after a lot of research, and a lot of disappointing results, I changed my plans to an aluminum block vortec 5300 with 6 speed auto trans. there are a ton of advantages, smooth ride, tons of power, 25-30 mpg, and its much lighter than the 4bt. to me a v8 sounds better as well

the only thing i could see as an advantage is towing capabilities, and thats debatable and doesnt matter as even the LJ is too short of a wheelbase to pull anything significant

now i'm scouring the yards for late model silverados
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Unread 09-13-2013, 12:12 PM   #6
Jeepsr4me
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Quote:
Originally Posted by Ironhead View Post
I was in the same spot, and after a lot of research, and a lot of disappointing results, I changed my plans to an aluminum block vortec 5300 with 6 speed auto trans. there are a ton of advantages, smooth ride, tons of power, 25-30 mpg, and its much lighter than the 4bt. to me a v8 sounds better as well

the only thing i could see as an advantage is towing capabilities, and thats debatable and doesnt matter as even the LJ is too short of a wheelbase to pull anything significant

now i'm scouring the yards for late model silverados
X2 on this.. The OLD 4bt idea has come and gone. no real advantage to it any more.
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Unread 09-13-2013, 12:15 PM   #7
sjones26573
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Quote:
Originally Posted by DirtRider1357 View Post
I will mostly likely find a used motor from a bread truck. I was reading about a guy on 4btswaps that kept his nsg370. Still have a lot of research, planning, and saving to go though
Anything with decent torque will eat an NSG for breakfast. Novak recommends against using it on their site.
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Unread 09-13-2013, 02:51 PM   #8
Agony Wagon
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I probably won't do the 4bt swap, but I collected some links on it anyways. Here they are, in case you didn't see all of these already:


http://lucienfrelin.com/jeepbuild/category/engine/
http://www.vnutz.com/articles/Cummin...sel_Conversion


http://www.4btswaps.com/forum/showth...-a-4bt-diesel/
http://www.jeepforum.com/forum/f22/d...4bt-tj-973041/
http://www.jeeps-offroad.com/showthread.php?t=4740
http://www.jeepforum.com/forum/f9/cu...69/index2.html
http://www.jeepforum.com/forum/f22/o...mmins-1389565/


http://www.jeepforum.com/forum/f12/b...tions-1197743/
http://www.4btswaps.com/forum/showth...d-motor-mounts
http://www.jeepforum.com/forum/f12/4...-pics-1275843/

That jdjeeps link someone gave above is really good, too.
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Unread 09-13-2013, 05:04 PM   #9
Bigdude408
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Remember those old military motors that could run off of practically anything. Karosene, used motor oil, fryer grease..... I don't know specifics, and I should research more, but with a conversion like that it could be possible. It would be a strong hold on the survival jeep rout.
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Unread 09-15-2013, 12:18 AM   #10
DirtRider1357
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If i were to use an nv4500 i know i need an adapter to keep my tcase but would i need for the motor too or could i remove the stock chevy adapter?
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87 YJ, 4.0L, 5speed......sold, 05 LJ Rubicon
"It'll buff out"
"If it moves and shouldn't, use Duct Tape & Zip Ties. If it doesn't move and should, use WD-40 & A hammer"
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Unread 09-15-2013, 11:24 PM   #11
DirtRider1357
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if i do the swap i think i will end up using the ford 4bt, taking the stock ford adapter off and getting and adapter off of a 6bt. this will allow me to run the dodge nv4500, then keeping the rest of my stock drivetrain stock as the nv4500 will bolt up to my nvg241or tcase.
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87 YJ, 4.0L, 5speed......sold, 05 LJ Rubicon
"It'll buff out"
"If it moves and shouldn't, use Duct Tape & Zip Ties. If it doesn't move and should, use WD-40 & A hammer"
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Unread 09-19-2013, 10:28 AM   #12
youngjeeper11
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I love mine, though it is still in the works, but it runs and drives!

I found a wrecked 6bt cummins dodge ram, and bought everything from the adapter plate the tail of the NV4500, it all bolts right to the 4BT, including the flywheel, clutch, throwout bearing ect ect, I even used the dodge ram clutch master cylinder. IMHO, this is the way to go, one of the strongest 5 speeds available, and everything bolts up, no expensive adapters and mismatched parts.

When it comes down to it, it depends on what you want out of your jeep, I love diesel, I love a loud turbo, and tons of low end torque. I have built 2 Chevy V8 YJs, and I will take my 4BT YJ over them any day.

I would not say the 4BT idea has come and gone, I would say it has the potential to stick around and become more perfected.
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Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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Unread 09-19-2013, 11:18 AM   #13
cjheap
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Quote:
Originally Posted by Bigdude408 View Post
Remember those old military motors that could run off of practically anything. Karosene, used motor oil, fryer grease..... I don't know specifics, and I should research more, but with a conversion like that it could be possible. It would be a strong hold on the survival jeep rout.
It would be hard to transplant one of those. They are in deuce and 1/2s .

The desirable ones are from the early 70's and are turbocharged. Lever on the dash to choose between gasoline / diesel / jet-a
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