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Unread 09-05-2002, 10:43 AM   #1
FutureZJOwner
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How hard is an engine swap?

I've noticed that I-6 Grand Cherokees are alot of the time alot cheaper than the V8s. I am considering buying an I-6 when the time comes, and putting a V8 in it, say the 5.2 or the 5.9 if it is a ZJ, or the 4.7 or MAYBE the 5.9 in the WJ, if possible. How hard would it be to just buy another engine and make it work...is it bolt on, or would I need to buy an ECU, and a plethora of underhood and otherwise sensors? Need the knowledgable and the experienced about engine swaps here

Thanks for any help!!

Sean

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Unread 09-05-2002, 11:29 AM   #2
NaeKid
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Swaps are easy to do, if you have the right tools. The automatic tranny in the GC is the same as the one in the XJ 4.0. I have heard stories of people swapping in the 304ci, the 318 or the 360 into their Jeeps, and using the stock automatic tranny.

How hard is it? Well, if you want to continue using fuel-injection there are computer issues to look at (that's the biggest issue), the motor mounts shouldn't be too hard (call up the dealership and get stock V8 motor mounts) .. and then spend some time working out the procedures for the time required to do the swap. If things go well, you would be done in under a week ... if it doesn't go well, you could be lookin' at a year
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Unread 09-05-2002, 01:07 PM   #3
FutureZJOwner
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Thanks!

Thanks alot NaeKid. Yes, I will use MPFI. IS a new ECU or a good used one that high? Also, besides the computer, are there any more electronic obstacles?
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Unread 09-05-2002, 02:50 PM   #4
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Then in the case that you are going to be using a fuel injected engine, you should get the engine, all the wires related to the engine as well as the computer that came with the engine. Pull your engine, the wires and the computer and set it all off to one side.

Then you start hooking things back into your engine bay in the reverse of the big 8's removal proceedure ..

Some things that might become issues (depending on what year the engine comes out of, and what kind of vehicle it is) would be clutch/auto .. flywheel .. internal/external balance .. starter and such. Even a "drop in" engine doesn't mean that everything else would just drop in with it.

I don't want to turn you off on this type of change over .. but it could become a huge pile of work .. that might not be worth purchasin' the I6 and then changin' to V8. You could get the small V8 and then swap to the large one a little easier .. or skip on the fuel injection and do the carb'd engine swap then use the Holly-Projection to turn the engine into fuel-injected ..
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  • From street to trail, '88 YJ on 38" tires does it all well
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  • a Kawasaki KLR650 DualSport bike

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Unread 09-07-2002, 06:05 PM   #5
FutureZJOwner
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Sorry, details added

NaeKid, the engine swap would STRICTLY BE on a Grand Cherokee, either ZJ or WJ. Sorry about not making that clear . Being that sometimes the WJ I-6 is significantly cheaper than the v-8, I was thinking that I could buy an I-6 and swap in the 4.7 or MAYBE the 5.9, and in the ZJ, finding a deal I couldn't pass up, swapping a 5.2 or 5.9 in there. Would this be hard, am I better off buying a V-8 to start?

Thanks!
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