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Discussion Starter · #1 ·
I am looking into swapping out my puny 4cyl in my '95 YJ and I want to put something random in there. Everyone has a 350 so I was looking to be a little different. I was thinking a 5.9L Cummins turbodiesel out of a Ram would be <IMG SRC="smilies/eek.gif" border="0"> and I was wondering if anyone had any info on this swap. I know its heavy as hell but it would be worth it <IMG SRC="smilies/eyemouth.gif" border="0">

Also, what other suggestions do you guys have for a not too common swap? I'm open to ideas
 

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Originally posted by BabyWrangle:
<STRONG>I am looking into swapping out my puny 4cyl in my '95 YJ and I want to put something random in there. Everyone has a 350 so I was looking to be a little different. I was thinking a 5.9L Cummins turbodiesel out of a Ram would be <IMG SRC="smilies/eek.gif" border="0"> and I was wondering if anyone had any info on this swap. I know its heavy as hell but it would be worth it <IMG SRC="smilies/eyemouth.gif" border="0">

Also, what other suggestions do you guys have for a not too common swap? I'm open to ideas</STRONG>
Yikes! how about a big block Oldsmobile? Not that I would do it, but you could spend ungodly amounts of cash to do it just so everyone that saw it could wonder what you were <IMG SRC="smilies/smokin.gif" border="0"> Then again the 5.9 would cost even more with the same effect. Do that one. <IMG SRC="smilies/rolleyes.gif" border="0">
 

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How about swapping in a series of eight
Briggs and straton 6.5 horse motors.

You can figure out how to set them all up in a pretty arange ment just like on them multi big block tractor pull things.
 

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How about a 351 windsor with a 392 Ford Motorsports stroker kit, Dart Windsor heads,MSD billet dist.,Edelbrock intake,Holley 750 the list can go on. i have one in my Bronco that i had an accident in now. $2500.00
 

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It is possible, I saw some pictures on the web not too long ago of a CJ7 with a 5.9L cummins stuffed in, your looking at ~1000lbs. I'll see if I can find them again. Hop up a 12v cummins and you can make 1000 ft/lbs torque <IMG SRC="smilies/smile.gif" border="0">
 

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Well, seeing is how you'll need a new tranny... Most likely you'll have trouble attaching the new tranny to the t-case... All that would cost some cash...

My dream has been to put a BMW straight six in my CJ-7, which needs a new engine soon. The B'mer motors come in a variety of sizes, from 2.3L to 3.2L, ranging in power from 150hp to 240hp. (All of which can be modified to yield over 300hp if you like.) These engines are light, torquie and incredibly reliable, requiring far less maintenance than any diesel, or Chevy 350. Not to mention it would be something no one has ever seen. Imagine what the guys on the trail would say. Imagine what the guy at the BMW Dealership would say when you drive up asking for a 40,000 mile servicing.
 

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one of the 4X mags did a write up on a Co down in South Tx that put a 3.9 cummins in an old Willys pickup. I think it had over 500 ft lbs of torque. <IMG SRC="smilies/jeep2.gif" border="0"> <IMG SRC="smilies/jeep2.gif" border="0"> <IMG SRC="smilies/jeep2.gif" border="0">
 

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Discussion Starter · #10 ·
Originally posted by Rockslut.:
<STRONG>Plan on beefing up the front frame rails. <IMG SRC="smilies/eek.gif" border="0"></STRONG>
I already planned on doing that anyways, regardless of what motor I swap in. I know I need a new tranny regardless of the swap so I planned on that too. I am in the process of getting 1-ton axles under my YJ with 5.13s and spools F/R.

My reasons for wanting a diesel are simple:
1. Tons of torque @ low RPM - good for rockcrawling
2. I'm not used to my YJ being fast so if I put a 454 or 502 or somrthing to that effect, I'd get too many damn speeding tickets <IMG SRC="smilies/mad.gif" border="0">
3. I've never seen a diesel swap in a YJ (or CJ for that matter) in person.
4. I think it would be awesome to sound like a semi is coming down the trail <IMG SRC="smilies/glasses.gif" border="0">

Does anyone have any more info on the 3.9L cummins 4 cylinder? I am looking for approx 150-180HP and 350+ lb/ft torque.
 

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You really dont need all that much torque anymore for wheelin. Sure you did a few years ago when crawl ratios were 50:1 or lower. But nowadays, with crawl ratios at 150:1 and up, hell you could just about peddal up the hill.
Wheel speed on the other hand, is becoming common practice to scale many of the ARCA obstacles.
There is a reason so many people are using the Chevy 350, it has a ton of good atributes for a rock crawler, mud bogger, sand runner, or anything else thrown at it.
It seems like a ton of work with no better results than, the ol tried and true SBC.
It would be cool to see how it came out though when your finished, provided you dont mind smelling deisel fuel/fumes all day. Just think of that exhaust wafting up around you all day long while your going 0 miles an hour, with no wind, on a 120 degree day on JackHammer, <IMG SRC="smilies/puke.gif" border="0">
 

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Discussion Starter · #14 ·
I agree with you about the crawl ratios. Right now I have the stock 4.11s and 33s. It does perfectly fine offroad though thanks to a Teralow 4:1 kit I installed a few months back. Now its 65:1 and pretty much I can idle over anything and if not all it takes is a little tap of the gas. I am going to 1-ton axles with 5.13s so my new crawl will be 85:1. Should be good though I will be running tires in the 38-40" range offroad.

My reason for a swap is so I can tow a trailer with gear and my offroad tires to the trails so torque is a must. I'm really interested in that 3.9L cummins swap. Can someone point me in the direction of the previously mentioned article or any other articles they know about?
 

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There is a CJ7 in West Sacramento with a 5.9L Cummin' in it.
The guy literally started with 30 feet of rectangular tubing and fabbed up a whole new frame for it. He had to stretch the front sheet metal six inches to clear every thing.
Transmission was an NP435, and a D300 T-case. Axles were a 30 front and 44 rear. There was (last time I saw it, about eight monthes ago) no way a front drive shaft would EVER clear the oil pan, with out a lot more lift. I beleive it was already SOA with lift springs.
It sounded killer, and would scoot down the road very fast.
I want to do a 3.9L Cummin' in my YJ. The swap would not be all that difficult. I would maintain about the same amount of horse power, but at least quadruple the torque.
Cummins actually manufactures adapters to mate these engines to most popular trannies, like the TH400, NP435(factory Dodge bellhousing), SM465/420, T18/19/98, and NV4500(factory Dodge bellhousing).
In my searching for this swap, I have found that Cummins West sells Cummins ReCon BTA 3.9L 130HP engines for $4635, plus a $2000 core.
Core engines are available everywhere for pennies(ok, small dollars) and a rebuild kit pretty cheap.
The 3.9L is about the same length as the 258 I6, considerably heavier. With factory Dodge bellhousings, it would be cheap to mount to NP435s or an NV4500. While spring and axle strength would be a concern, I would not worry too much about frame strength with the 3.9L in a YJ. The 5.9L is another deal altogether. Early Dodge pickups equipped with the 5.9L quite often came back to the dealership with one front tire up in the air from the frame being twisted by the torque!!
<IMG SRC="smilies/eek.gif" border="0"> As a result, Dodge beefed up their frames and detuned the engine.

[ 08-28-2001: Message edited by: Robert ]
 
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