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Old 01-30-2012, 05:49 PM   #1
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Default 86 XJ 2.8L upgrade

I'm new to these forums but I've been doing some searching around and was hoping someone could answer a question for me.

I have an 86 XJ with a 2.8L v6 that I'm looking to upgrade. I also have a 96 ZJ with a 4.0L I6. I already know that a 3.4L is a relatively easy swap but I've been having trouble finding a definitive answer to this question. Would it be worth it to try to put the ZJs I6 into the XJ or am I still better off looking into a 3.4L?

Any input is appreciated .

P.S. I know the conversion is a lot harder, what I'm wondering is just how much of a cost difference it would be since I already have a running donor vehicle.

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Old 01-30-2012, 05:58 PM   #2
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The 3.4L is definately going to be a MUCH easier swap. You basically just need the block and retain all the 86 XJ stuff. The engines can be had for pretty cheap also if you find a camaro or firebird that had one in it 93-95 I believe. Really simple stuff as long as your existing stuff works fine. With that said though, the 4.0 in the GC is a better engine imo. Its gonna be a ton of work to make the GC 4.0 work in the XJ. You need to transfer the computer harness over and I believe the trans is not a AW4, I want to say its the 42RE. Regardless, in order to put the 4.0 and tranny/tcase in the XJ you have to basically transfer EVERY part from the ZJ into the XJ. I honestly think you should just do the 3.4 swap as those engines are pretty decent. I have one in my 85 firebird and it pulls decent, much better than the 2.8.
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Old 01-30-2012, 07:21 PM   #3
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Appreciate the honest answer . I still haven't quite made up my mind about what I want to do but I'm leaning towards swapping in a 3.4L and saving a bigger swap as a later project. (If not just running it that way until I can trade up).
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Old 01-30-2012, 09:07 PM   #4
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Why not a V8, theres a few companies that make conversion kits.
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Old 04-24-2012, 03:50 PM   #5
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Quote:
Originally Posted by Metmknice View Post
Why not a V8, theres a few companies that make conversion kits.
I am looking to upgrade also, can I get some company names?
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Old 04-24-2012, 03:53 PM   #6
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Quote:
Originally Posted by Scott in WY

I am looking to upgrade also, can I get some company names?
Advance adapters, Novak adapters, and I know there's one more.
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Old 04-24-2012, 05:08 PM   #7
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Word on the street is a 4.0 won't fit because the firewall isn't deep enough for it.

You won't be money ahead no matter which direction you go, some sort of V8 would be nice.
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Old 04-24-2012, 05:19 PM   #8
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heres a pretty detailed swap....http://www.lunghd.com/Tech_Articles/...Project_XJ.htm
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Old 04-24-2012, 06:35 PM   #9
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Quote:
Originally Posted by jbsjunk
Word on the street is a 4.0 won't fit because the firewall isn't deep enough for it.

You won't be money ahead no matter which direction you go, some sort of V8 would be nice.
Uh, mine fit. I have an 85. It had a blown motor and I put one in. Can't lie, it's tight but it fit. Lol
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Old 04-24-2012, 06:41 PM   #10
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My vote's on either the 3.1 or 3.4. Like everyone else has said, it will be MUCH easier!
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Old 04-24-2012, 06:41 PM
 
 
 
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