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Unread 10-05-2010, 10:34 PM   #1
95yjjeepster
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what engine to use in swap

I am getting ready to do an engine swap in my 1995 yj 4cyl. The problem is which engine to use, 4.0 i6, 4.2 i6 or a v8. Also what transmission to use with them. I recently found a 88 4.2 engine and transmission on cl for 300 and found few v8 around the same. I've got just over 600 to spend and the engine and drive train on my yj to sell. What set up would be the most cost effective and reliable.

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Unread 10-05-2010, 11:21 PM   #2
MJMPC
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With $600 I would try for a 4.0. A 4.2 would be a downgrade.
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Unread 10-05-2010, 11:36 PM   #3
five-string
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Cost effective, reliable and under $600? Only one of your three choices remains, a 4.0L. Don't do the 4.2. It has less hp than your 2.5. I'm ready-ing myself for a 4.0 swap in place of my perfectly running 4.2.

And a v8 swap is talking most or all of your budget in adapters.
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Unread 10-05-2010, 11:39 PM   #4
hmmhoyhoy
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Quote:
Originally Posted by MJMPC View Post
With $600 I would try for a 4.0. A 4.2 would be a downgrade.
X2, stay away from the 4.2
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Unread 10-05-2010, 11:53 PM   #5
AnonymousD
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4.0 will be much easier and cheaper than a V8.
Plus the 4.0 gives you so much room to work on under the hood. I just got my 4.0 YJ and I have been driving a '94 Mustang GT with a 5.0 in it, and I was amazed at how much room there was under the hood of this thing.
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Unread 10-06-2010, 07:41 AM   #6
95yjjeepster
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If I went with the 4.0 what about the engine mounts. I read somewhere that the mounts are different than the 2.5, and also have to replace the fuel lines and CPU and some other stuff. Also was told to not even bother doing 4.0 swap that it would cost three times more to do The swap than to sell my yj and buy one with the engine already installed are these statements true
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Unread 10-06-2010, 07:54 AM   #7
1998zj
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If you go with the 4.0 you need to get the transmission and transfer case too. The ones on your 2.5 will not work. I agree with the guy that said sell your 2.5 and buy a 4.0 if that is what you want. It will be cheaper.
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Unread 10-06-2010, 08:02 AM   #8
parkerm26
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why the hell are you going to put a new engine in something your selling? you wont get more than 500 extra for having a 4.0. and plus its not stock(which means most people wont trust your mechenical abilities and therefor won't want to buy it) so you instantly loose at least 50% of potential buyers. it makes no sense. just leave it stock and clean the engine with degreaser and do a full tune up. make it look really good. some people are looking for little 4 bangers these days for better milage anyway. good luck with it
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Unread 10-06-2010, 08:05 AM   #9
five-string
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parker, I think you misread his stement. I think he meant selling his original motor and tranny after the swap.

It really depends on what you can find for a donor. I just bought an entire Cherokee with a purrfectly good motor tranny and transfer for $400. I will use all the wiring, computer and motor in my yj plus strip out all the goodies I can find like relays, toggle switches, plugs, bulbs, etc, then I will recover around half my money by selling the rest to the local bone yard. Watch craigslist for a while, be patient and a great deal will come along. Cherokees are a dime a dozen.

I understand you do have to change the frame half of the motor mounts for a 2.5 to 4.0 swap.

Having use of a shop with lots of tools will help make it go easier and less expensive if you can do things like welding and pulling motors on your own.

Read up on the swap in here.
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Unread 10-06-2010, 08:12 AM   #10
Rocky_Cosmark
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he isnt selling his yj, he was just saying in the original post that he has $600 plus the sale of his yj drivetrain after he takes it off,but for some advice on the swap, if you want big power but mostly for offroad, get a v-8. Yjs arent great for road use with a v-8 because its terrible gas mileage and the extra weight causes suspension sag over time compared to the i6. But also everyone else is about right saying its a pretty big job to swap from a i6 to 2.5l, and could be cheaper and easier to buy another yj with a 6cyl.
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Unread 10-06-2010, 08:23 AM   #11
Pupuslinger
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I thought about doing this also when my 4 gets more tired, has about 200k now. Not sure why it would be such a big job if they came with the motors in a different model. Motor mounts and such I can see, but seems like it should be something you can bolt in with the right parts, I will have to do some more research on this for sure. Nice to know the 4.0 is better than the 4.2.
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Unread 10-06-2010, 08:27 AM   #12
dodger889
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Your checpest way to go is find an running xj or yj that has rear end damage, and pull the engine out of them. Then sell off the good parts then scrap the rest of it. That way you can recoup some of the money spent getting the engine to finish your swap. Like another said if you have shop(garage) setup to do the work yourself. That will save a lot there.
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Unread 10-06-2010, 09:47 AM   #13
superj
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or, trade me your 4 cylinder wrangler and take my 4.0 cherokee and sell and use money to buy a 4.0 wrangler. then you can cut out all the screwing around and be right where you want to be.
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