4 cylinder to 6 cylinder - JeepForum.com

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post #1 of 18 Old 07-06-2010, 12:41 PM Thread Starter
2000TJMan
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4 cylinder to 6 cylinder

To go from I4 to an I6 how hard would it be, and what would have to be done, would it be worth the hassle.

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post #2 of 18 Old 07-06-2010, 12:42 PM
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Just as easy to go V8

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post #3 of 18 Old 07-06-2010, 12:48 PM
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It's usually better to just sell the TJ with the I4 and buy one with the I6. In addition to the engine, you'd need a different transmission, transfer case (or change its input shaft), the driveshaft lengths would need to be changed, a new engine wiring harness is needed, and you'd need a new engine computer. Not to mention the engine mounts would need to be cut off and new mounts welded into place.

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post #4 of 18 Old 07-06-2010, 12:52 PM Thread Starter
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I figured it would be easier to buy one with an I6 just checking though. Thanks.
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post #5 of 18 Old 07-06-2010, 09:24 PM
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I did it, as did many others on here.. It is as easy as going to a V8, but much cheaper..

I bought a wrecked TJ with I6 and swapped all the parts.. Other than welding new motor mounts on, it was all plug and play..

After selling the old parts and selling the rest of the wrecked TJ I broke even or actually made a few $$...
I could not be happier.. 4.10 gears from 4cyl, I6 power and torque.. Even with 35" tires it ran and has more than enough power..

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post #6 of 18 Old 07-07-2010, 11:49 AM
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Quote:
Originally Posted by duglas25 View Post
I did it, as did many others on here.. It is as easy as going to a V8, but much cheaper..

I bought a wrecked TJ with I6 and swapped all the parts.. Other than welding new motor mounts on, it was all plug and play..

After selling the old parts and selling the rest of the wrecked TJ I broke even or actually made a few $$...
I could not be happier.. 4.10 gears from 4cyl, I6 power and torque.. Even with 35" tires it ran and has more than enough power..
X2!

I've swapped V8s and the 4.0. There are way more issues to deal with swapping in a V8. Folks that say it is "just as easy" have never performed the swap. I'd rate the 4.0 swap as EASY and CHEAP. I just finished my swap of a 2002 4.0 into my 2001 TJ. I even reused the old mounts I cut from the frame.
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post #7 of 18 Old 07-07-2010, 11:54 AM
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post #8 of 18 Old 07-20-2010, 07:32 AM
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post #9 of 18 Old 07-24-2010, 11:44 AM Thread Starter
2000TJMan
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Thanks that last post was very helpful.
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post #10 of 18 Old 11-01-2011, 08:46 AM
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Go to a v8 for some real power!
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post #11 of 18 Old 02-09-2012, 02:47 PM
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yeah im looking to do this also, but i dont want to deal with the hassles of a V8. I just want to do the 4.0. Let me know if you find anything out! i would be happy to help you also if i find anything worth while.
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post #12 of 18 Old 02-09-2012, 03:45 PM
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I'm curious what hassles a V8 swap has over a I6 swap. If you are mechanically inclined enough to do a I6 swap, a V8 swap is not much harder if harder at all.
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post #13 of 18 Old 02-09-2012, 04:05 PM
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Originally Posted by clintrivera View Post
I'm curious what hassles a V8 swap has over a I6 swap. If you are mechanically inclined enough to do a I6 swap, a V8 swap is not much harder if harder at all.
Finding parts for the V8 swap is more difficult. For example, radiator hoses.

The wiring with the V8 swap is more difficult. No plug and play, you'll be splicing.

The exhaust for the V8 will be custom.

Transmission behind the V8 will often require a custom crossmember.

V8 will sometimes need gauges other than stock TJ gauges.
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post #14 of 18 Old 02-09-2012, 04:23 PM
clintrivera
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Quote:
Originally Posted by Wheelin98TJ View Post
Finding parts for the V8 swap is more difficult. For example, radiator hoses.

The wiring with the V8 swap is more difficult. No plug and play, you'll be splicing.

The exhaust for the V8 will be custom.

Transmission behind the V8 will often require a custom crossmember.

V8 will sometimes need gauges other than stock TJ gauges.
As far as my LS swap went the stock lower hose that came with the engine worked fine cut down a little, the upper was a $10 universal hose. The wiring for the engine to run required two wires to be spliced in (ignition and fuel pump).

The exhaust was easy with a few bends, and if you don't get the whole donor for the I6, you will have to do some fabbing on the exhaust as well. My crossmember needed one hole drilled to work. Stock guages work great and I even have a tach with the Novak converter (stock senders in the block).

Not to mention the engine is lighter, has more power, gets better fuel economy, more potential to mod, sounds better, etc, etc...

Not a cheap swap though. On a budget I would have to go with the 5.2/5.9 magnum.
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post #15 of 18 Old 02-09-2012, 04:25 PM
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Originally Posted by 98Tjboy View Post
Go to a v8 for some real power!
Why? yours won't do the speed limit?
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