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Unread 04-04-2012, 12:30 PM   #1
00xj54
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The 4.0...

The 4.0 is obviously a great engine. Well, I know it was great in the XJs anyway. Was it AS great the other jeeps?

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Unread 04-04-2012, 01:32 PM   #2
Max-Q
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yes
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Unread 04-04-2012, 03:44 PM   #3
ShrekII
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Straight 6's are hard to beat...the old Dodge slant 6 was damn near indestructable..

The Ford old 300 I-6 is a beast.

I've had a couple of Chevy I-6's, but they were really smogged up 70's cars, they weren't really impressive.

I would love to have an old straight 8 from the early days of motoring..

We have a 95 ZJ with the 4.0, it has 186k miles & is running strong...It's our "road trip" vehicle...
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Unread 04-04-2012, 04:01 PM   #4
Millermagic
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I've always heard great things about the ford and mopar sixes ... never heard much of anything about the GM sixes.
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Unread 04-04-2012, 04:46 PM   #5
greenmachine99
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When I can keep rear main seals and exhaust manifolds on it, it's fine. Pretty gutless but will run forever.
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Unread 04-04-2012, 05:30 PM   #6
andy_mitch92
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Quote:
Originally Posted by Millermagic View Post
I've always heard great things about the ford and mopar sixes ... never heard much of anything about the GM sixes.
The GM L-6 motors were great.



Six in a row is what use to be the go fast motors.

Now all GM needs to do is add a turbo to its 4.2L DOHC I6... It already makes around 300Hp/Tq. Could really give that eco boost ford for its money if done right.
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Unread 04-04-2012, 05:35 PM   #7
ShrekII
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Originally Posted by andy_mitch92 View Post
The GM L-6 motors were great.

http://www.youtube.com/watch?v=gex-u...eature=related

http://www.youtube.com/watch?v=xA1qaZairZ8

Six in a row is what use to be the go fast motors.

Now all GM needs to do is add a turbo to its 4.2L DOHC I6... It already makes around 300Hp/Tq. Could really give that eco boost ford for its money if done right.
would love to see what the torque rating on that cj-5 was...


Looked like it was gonna inhale that front license plate.
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Unread 04-04-2012, 06:03 PM   #8
zander21510
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I've heard stroked 4.0s wreck newer larger v8sj

and hell these things go 300k easy stock.
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Unread 04-04-2012, 06:15 PM   #9
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Unread 04-04-2012, 06:18 PM   #10
chriskeenan
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the 4.0L in my XJ is great, the 4.0L in my sisters old WJ was gutless, but that has more to do with the WJ being a fat pig than anything.
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Unread 04-04-2012, 06:46 PM   #11
zander21510
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It seems like they really pussied up the 4.0 past 98 from what I've read...what with all the emissions standards and such
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Unread 04-04-2012, 06:52 PM   #12
Azzy
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It all has to do with the trans it is mated to. When mated to the 42RE in the GC, not so great. To the AW4 and the AX15... good stuff.

It seems with the emissions garbage (like 3 cats) on the late 2000's and up came sub standard parts. ive seen a lot of posts about cracked pistons and flexplates, more so with newer XJs.

My 96 runs like a champ, with old age issues here and there, but still runs strong with 270K.
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Unread 04-04-2012, 07:38 PM   #13
chowner
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98 never had any problems. 01 had head and intake manifold issues.

98 prior seem to be the good ones
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Unread 04-04-2012, 09:05 PM   #14
Millermagic
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Quote:
Originally Posted by Azzy View Post
It all has to do with the trans it is mated to. When mated to the 42RE in the GC, not so great. To the AW4 and the AX15... good stuff.

It seems with the emissions garbage (like 3 cats) on the late 2000's and up came sub standard parts. ive seen a lot of posts about cracked pistons and flexplates, more so with newer XJs.

My 96 runs like a champ, with old age issues here and there, but still runs strong with 270K.
When I had the stock 27'' tires on my XJ I had one of my go-fast friends with me. He was surprised at how quick my lifted box was!
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Unread 04-04-2012, 09:38 PM   #15
JFranko
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Quote:
Originally Posted by Millermagic View Post
I've always heard great things about the ford and mopar sixes ... never heard much of anything about the GM sixes.
They were putting a 4.2L in the trailblazers up until they stopped making them. I drove one for about half a year and really liked it. It was pretty quick for a big SUV (270hp 275 ft/lbs of torque). My mom owned it for 10 years before me and we never had any problems with the engine. It was also on Ward's 10 best engines list for a few years.
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