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Old 11-25-2008, 11:37 PM   #1
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newbie has a wrangler engine swap question

i bought a 89 wrangler, with 6 cyl engine out. prior owner gave me a complete low mileage engine out of an early 90's cherokee, but it is fuel injected which has a different intake and exhaust manifold, so i can't put the non fuel injected intake or exhaust on this engine.. i would like to use this engine, does anyone make an adapter to go from throttle body pattern to a carb pattern??? and i'm assuming all i'd have to do is tap out the injector holes and plug them??

any help will be appreciated, pm me or email me direct please. jjjjjgrant@bellsouth.net

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Old 11-27-2008, 10:21 AM   #2
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you would be better off finding the harness and computer for the Fi motor and installing it. It is a pretty easy swap I did it on my 88 because FI is usually better on the trails and you dont have to worry about the crappy carb that came on the 4.2's.

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Old 11-27-2008, 12:14 PM   #3
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x2, i've never heard of anyone putting the carb top end on a 4.0

the 4.0 is a great upgrade from what is in your wrangler now. also a common swap is to use the 4.0 head on the 4.2 block, giving you the fuel injection without swapping the whole motor.

or build a stroker, you have all the parts
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Old 11-27-2008, 12:25 PM   #4
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I agree that building a stroker would be a great project, but realize that you do need a but of knowledge of the engine to make it work correctly as there are alot of write ups on it but YOU still have to make it actually work . I actually work on jeeps alot and still havent had the guts to try that one
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Old 11-28-2008, 10:58 PM   #5
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wrangler engine swap question????

i had considered changing it to fuel injection, i have the fuel rail and injectors, i assume i would engine harness, computer, all fuel lines and fuel tank??? what year wrangler do i need to get these items from???

Thanks, for the help

jeff
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Old 11-28-2008, 11:04 PM   #6
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There would be considerably more to it than what you have mentioned, the head is different between the 4.2 and the 4.0 however if you really want to get into that then you may as well build the stroker.

If you swapped out the 4.2 completly for the 4.0 then you would need the computer completye engine with all FI parts and the computer to go with it. I just did that to my 88 and installed the engine from an 83 and the trans as well.
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Old 11-29-2008, 02:21 PM   #7
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people do modify the 4.0 head to fit the 4.2, then you're just changing the top end. i think the mod is only pluging a port or two, not sure. you would still need computer and wiring harness, fuel pump and lines. i personally think for the effort you might as well go to 4.0. but it is an option to look into, it is cheaper.
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Old 12-10-2011, 02:50 AM   #8
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Greetings to all

First of all, I would like to say that I am a loyal jeep fan, I had a 94 YJ which I traded for 98 TJ back in 2000. I've done a lot of mods over the years (regeared, air intake sys, exhaust sys, stroked engine, ignition sys, etc) on top of 4.0" lift kit and 33" tires. I can literally say that I took my TJ across continents. I moved from N.C to Kuwait and back to the states. I did a lot of street drag racing (rebuilt a stroked engine twice)... i considered Nitro and Super-charge sys at one point, but after some research i realized it wouldn't be a good fit for 98 TJ

Now that I'm back in the states, I'm looking for a new or used JK and I want it to be a BEAST when it comes to hp and tq. For that I have a couple of options:

1- Get the new 2012 JK V6 VVT (285 hp 260 tq) and later put on a supercharger
2- Get JK prior to 2012 and do engine swap

I've been hearing mixed reviews on engine swaps. I checked few web sites like http://www.cop4x4.com/ and they claim 400+ hp and tq!! which is very tempting if there aren’t any side effects

Since I ONLY worked on 4.0 I-engines and never did an engine swap, I consider myself newbie on the subject and I seek expert advice.

Which option would you recommend? Or you thoughts in general....


Sorry for the elongation.... my 1st post.... I promise it will get better
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Old 12-10-2011, 08:46 AM   #9
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I helped a buddy do this swap a year ago. His 4.2 turned loose in the bottom end. A lot cheaper swapping than fixing. We got a 4.0 and harness out of a '90 model yj. Sounds like you know what you need. Don't forget the fuel pump.

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