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  #1  
Old April 3rd, 2011, 10:36
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Bloose Bloose is offline
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5.2L Magnum XJ engine swap

Hello everyone,

The 4.0L in my '98 appears to have seen better days. The other day while I was on the freeway the drive on the oil pump broke and I lost oil pressure. I was pissed so I drove the POS to the off ramp and to the nearest gas station. When I finally shut it down it was making quite a bit of noise. At this point it's time to consider which motor is going to replace the original.

My main question is, has anyone either done or considered doing a 5.2L (318 Magnum) swap into the Cherokee. It seems like such a natural fit as they came in the Grands. Putting a Chryco motor in my Jeep would really help out in the emissions department as I still need to do that here in WI. They no longer do tail pipe testing and only plug into the OBD2 port. So running a Chryco computer from some '98 would keep me from having to jump through hoops. Also, keeping the 241OR t-case that I paid a kings ransom for is high on my list and running a Jeep trans would make keeping it a reality.

Is a 5.2L swap as attractive as it appears to me? I really don't want to get into a discussion about the $$ to HP reward of such a swap because increasing the HP of any V8 is a much simpler proposition than on any I6. V8's from any of the big 3 enjoy immense aftermarket support where the 4.0L enjoys some but not to the extent of the V8's and not at the low prices. I'm more concerned about if there is a real reason no one does these swaps, i.e. the motors won't fit, the trans is too big, or some other situation I'm not seeing.

If I could do any swap I wanted I'd run a 5.0L Ford V8 in there. They are small, light, and nearly as cheap to build as a SBC. The make tremendous power for their physical size and are extremely reliable. Not to mention that I have several 5.0L's laying around, one of which is freshly rebuilt. I also have a good AOD I could use. The AOD is nice because it has O.D. yet doesn't require a computer. The problem is, no one make an adapter to mate a Jeep T-case to the AOD. Also, emissions would be a problem as it is not a Chryco product. The FI I have for the 5.0L is from a '90 further complicating the emissions situation.

I know lots of guys have done the LS swaps but I'm not too interested in that because of the price of admission. If I had or could get a complete LS for cheap I'd consider it but there are far more costs involved with the LS swaps.

My last resort would be a Golen 4.6L stroker. I'd like to go to a V8 if possible so I'd like to steer clear of the stroker but it would be the simplest option.

Thanks for any input,
B-loose
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  #2  
Old April 3rd, 2011, 11:49
Sniggs Sniggs is offline
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Re: 5.2L Magnum XJ engine swap

Diesel
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  #3  
Old April 3rd, 2011, 12:08
anthrax323 anthrax323 is offline
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Re: 5.2L Magnum XJ engine swap

Interesting proposal - based on what I'm finding, the 318 Magnum (5.2) has a 23-spline output. This should allow you to retain the 241OR provided it bolts up to the Magnum's transmission.

http://www.backwoodsoffroad.com/cgi-...cle_id=2&sub=2

That article details the process for the TJ but should give you an idea of what to expect in terms of parts and labor.

Now, the brunt of your question (will it even fit in the engine bay?) I cannot answer, but would be interested to learn as well.
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Old April 3rd, 2011, 13:13
XJLI XJLI is offline
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Re: 5.2L Magnum XJ engine swap

the 5.0 is a way better option over the 318 imho.. not a big fan of the 5.2
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  #5  
Old April 3rd, 2011, 15:58
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Bloose Bloose is offline
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Re: 5.2L Magnum XJ engine swap

Quote:
Originally Posted by anthrax323 View Post
Interesting proposal - based on what I'm finding, the 318 Magnum (5.2) has a 23-spline output. This should allow you to retain the 241OR provided it bolts up to the Magnum's transmission.

http://www.backwoodsoffroad.com/cgi-...cle_id=2&sub=2

That article details the process for the TJ but should give you an idea of what to expect in terms of parts and labor.

Now, the brunt of your question (will it even fit in the engine bay?) I cannot answer, but would be interested to learn as well.


Thanks for the link! It looks as though the swap is just about what I was thinking it would be. The XJ's engine bay is tighter than the TJ's but V8's fit into the XJ pretty well and the 318 shouldn't be dimentionally different than most others.

B
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Old April 3rd, 2011, 16:04
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Re: 5.2L Magnum XJ engine swap

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Originally Posted by XJLI View Post
the 5.0 is a way better option over the 318 imho.. not a big fan of the 5.2
I'd prefer the 5.0L myself. I'm very familiar with them and I feel pound for pound and inch for inch a SBF cannot be beat. But all of the hurdles involved makes it a project that would be better suited to a longer term. If there were a way to bolt my 241OR to an AOD I'd find some way around the emission issue. Like running a '98 ZJ computer to run the 5.0? Or register it in a county that doesn't require emissions. As it stands though the 5.0L doesn't seem like the best way to go.

B
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Old April 3rd, 2011, 20:52
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Re: 5.2L Magnum XJ engine swap

I don't know yet about the physical dimensions as it goes into an XJ, but I do know about swapping the Magnums into Wranglers. I have a 5.9 in my TJ, a buddy has a 5.2 in his TJ, and I'm helping another friend install a 5.2 into his YJ. But I do plan on swapping a 5.2 into my wife's XJ sometime.

The great thing about the Magnum swap is that is meshes so well with the Jeep electronics. The PCM mounts in the same place as the XJ, the Dodge PCM will run all of the gauges, and the Grand Cherokee auto trans shifter mounts right to the XJ shifter.

One thing you need to make sure of, is that you need to make sure you use a 98+ Dodge PCM. The 96 and 97 does not have the same BUS as your 98, and none of the gauges will work.

And on my TJ, and a ZJ V8 fan fit the 4.0 shroud with a modified TJ radiator (outlets are switched), I used mounts from AA.

I used a Stak D300 Replace-A-Case to get the smallest t-case and longest driveshaft I could.
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Old April 3rd, 2011, 21:06
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Re: 5.2L Magnum XJ engine swap

I'd take a mopar small block over a Chevy or Ford small block all day long.

302 is lame ass.
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Old April 3rd, 2011, 21:12
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ROBZ95Xj ROBZ95Xj is offline
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Re: 5.2L Magnum XJ engine swap

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Originally Posted by MoparManiac View Post
I'd take a mopar small block over a Chevy or Ford small block all day long.

302 is lame ass.
XJ

to the OP why not do a 360, extrenally same as a 5.2 but with lots mo power
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Old April 4th, 2011, 06:52
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Re: 5.2L Magnum XJ engine swap

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Originally Posted by ROBZ95Xj View Post
XJ

to the OP why not do a 360, extrenally same as a 5.2 but with lots mo power
Bob has enough problems breaking chit with a 4.0l, not sure why he needs a V8!
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  #11  
Old April 4th, 2011, 07:45
Talyn Talyn is offline
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Re: 5.2L Magnum XJ engine swap

5.2 is a dog.
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  #12  
Old April 4th, 2011, 07:50
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Re: 5.2L Magnum XJ engine swap

Do some searching for articles written back in the mid 1990's in 4-Wheel Drive and Sport Utility Magazine. They built an XJ and swapped in a Chrysler V8, either a 360 or 318 (I can't remember).

It was a pretty tight fit and required a new radiator and motor mounts. They used the V8 and matching transmission from a similar year Dodge pickup and used the t-case from the XJ. They didn't talk much about the electronics.
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Old April 4th, 2011, 08:16
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Re: 5.2L Magnum XJ engine swap

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5.2 is a dog.

NOT in a Jeep, it's not.
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  #14  
Old April 4th, 2011, 08:39
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Re: 5.2L Magnum XJ engine swap

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Originally Posted by Gaius View Post
NOT in a Jeep, it's not.
230 hp and 300 ft lbs torque. For a V8 its a dog in any vehicle.
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Old April 4th, 2011, 08:40
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Re: 5.2L Magnum XJ engine swap

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Originally Posted by Gaius View Post
NOT in a Jeep, it's not.
Really? Not that I've driven / seen a Magnum engine in a Jeep but the power figures don't look like anything special. More than that, the light research I've done doesn't show squat for power adders without camming it or going back to a stone-age carbeurator.
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