Best and worst engines ever from Jeep - Page 2 - JeepForum.com

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post #16 of 39 Old 06-13-2014, 01:22 PM
1flbeachjeep
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2.4 CYL 2003 no problems at 109k.

Just got some basic stuff done (radiator flush etc.) ase mechanic goes this engine sound perfect! Are you selling?

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post #17 of 39 Old 06-13-2014, 01:24 PM
1flbeachjeep
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2.4 2003

No problems at 109k. Mechanic at dealer even said engine sound amazing are you selling. Also depends on how you drive and how you take care of it.
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post #18 of 39 Old 06-17-2014, 10:39 AM
CJ7nvrstk
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Funny thread. Some love what others hate.

Lotsa haters on the 3.8 even though that motor has the longest production run of any Jeep motor. They must have been doing something right.

Liked my 225, 150 (certainly better than the 134) and love my 360. Living with the 3.8 but neither love or hate it, it does the job.

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post #19 of 39 Old 06-20-2014, 01:57 PM
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Quote:
Originally Posted by CJ7nvrstk
Funny thread. Some love what others hate. Lotsa haters on the 3.8 even though that motor has the longest production run of any Jeep motor. They must have been doing something right. Liked my 225, 150 (certainly better than the 134) and love my 360. Living with the 3.8 but neither love or hate it, it does the job.
The 3.8L was found in '07-'11 wranglers.. I think you meant shortest production run of any Jeep motor lol.

It does the job but the fact it originates from a minivan and randomly leaks all the time makes it very undesirable..

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post #20 of 39 Old 06-20-2014, 04:22 PM
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Quote:
Originally Posted by Jeep_Fanatic View Post
The 3.8L was found in '07-'11 wranglers.. I think you meant shortest production run of any Jeep motor lol.

It does the job but the fact it originates from a minivan and randomly leaks all the time makes it very undesirable..
Production 1990-2011


Neither of mine have leaked a bit. 08 and 11.



FWIW, the Go Devil 134 L head that powered the Willys MB was a car motor.

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post #21 of 39 Old 06-21-2014, 12:35 AM
SouthernGray
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The best jeep engines are the 4.0 inline 6 and 5.2 318 V8. And the 4.6 Liter V8 is junk and 2.5 4 cylinder, no power. ....did you know the 4.6 Liter V8 was designed by Mercedes Benz? Go figure. They are notorious for breaking camshafts.
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post #22 of 39 Old 06-21-2014, 06:55 AM
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It's hard to best the torque of the 4.0 i6 but it could not pass the stringent emissions requirements so it was retired and replaced with the wimpy but reliable 3.8 by...my absolute favorite is the new 3.6 by Pentastar which is bulletproof and pushing almost 300hp, other than the valve guide problems on cylinder #2 on 11' and 12' models (warranty covered for 150k)this engine has been trouble free and gets 20mpg in wrangler!
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post #23 of 39 Old 06-21-2014, 04:07 PM
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Originally Posted by SouthernGray View Post
And the 4.6 Liter V8 is junk and 2.5 4 cylinder, no power. ....did you know the 4.6 Liter V8 was designed by Mercedes Benz? Go figure. They are notorious for breaking camshafts.
Uhh, what?

I assume you mean the 4.7, which was 100% chrysler designed and built. And considering I've seen plenty with 200,000 plus miles on them, I disagree.

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post #24 of 39 Old 06-22-2014, 11:01 PM
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Quote:
Originally Posted by mopartech
It's hard to best the torque of the 4.0 i6 but it could not pass the stringent emissions requirements so it was retired and replaced with the wimpy but reliable 3.8 by...my absolute favorite is the new 3.6 by Pentastar which is bulletproof and pushing almost 300hp, other than the valve guide problems on cylinder #2 on 11' and 12' models (warranty covered for 150k)this engine has been trouble free and gets 20mpg in wrangler!
The 4.0 I6 torque is ok, but I think it's overrated.

Just about any V8 has more torque.
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post #25 of 39 Old 06-26-2014, 12:27 PM
mopartech
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Originally Posted by Wheelin98TJ View Post
The 4.0 I6 torque is ok, but I think it's overrated.

Just about any V8 has more torque.
Lamo...and a Cummins diesel has more torque than a v8. We are talking jeep engines here not retrofit engines. Btw a 4.0 in a wrangler has a much better center of gravity and weighs less than a v8 swap. I would take the 4.0 any day and if you think you need more ponies then stroke it to a 4.7 and hold on😄
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post #26 of 39 Old 06-26-2014, 02:08 PM
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Originally Posted by mopartech View Post
Lamo...and a Cummins diesel has more torque than a v8. We are talking jeep engines here not retrofit engines. Btw a 4.0 in a wrangler has a much better center of gravity and weighs less than a v8 swap. I would take the 4.0 any day and if you think you need more ponies then stroke it to a 4.7 and hold on😄
I'm talking Jeep engines too.

5.2 V8 has more torque than a 4.0.

4.7 V8 has more torque than a 4.0.

4.7 V8 weighs less than a 4.0.

Get your facts straight.
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post #27 of 39 Old 06-26-2014, 04:08 PM
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Originally Posted by Wheelin98TJ View Post
I'm talking Jeep engines too.

5.2 V8 has more torque than a 4.0.

4.7 V8 has more torque than a 4.0.

4.7 V8 weighs less than a 4.0.

Get your facts straight.
you left out the 5.7 Hemi and the 5.9 mag

also the replacement engine for the 4.0 which was the 3.6L currently has more hp/torque, at around 260ft/lbs i believe...

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post #28 of 39 Old 06-26-2014, 05:28 PM
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Ok, thought we were talking jeep wrangler engines here, I can see that you are a guy who always as to be right...so your absolutely correct in the torque numbers. I would never personally rate the 4.7 in the top of any engine comparison though, it is a very complex and troublesome engine.
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post #29 of 39 Old 06-26-2014, 08:17 PM
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Last year of production 2.8 was MUCH better (internally balanced. Wider rod and main bearings). Iron Duke was sluggish and so was AMC 2.5 with carb. 350 Buick was awesome and the 230 OHC got a bad rep because leaded fuel went away and oils of the '60s weren't good enough to lube them. My friend has one with 230,000 miles with BW auto behind it in a '65 Wagoneer. It was his Grand Dads rig, who ran Amsoil in it.
Not fond of the 360's fuel "economy" but I have nursed a few up to 17 mpg highway in Wags. (before alcohol laced fuel) The Renault diesel in XJs and MJs till '87 sucked (French committee designed) but the Nissan SD33T is awesome. I like my 17 mpg 304 in my '73 J4000 and hated the 11 mpg with the 401. (swapped in a 4.0L and AW4/NV242) Isuzu 4BD1TA was used in some FSJs for the military as well.

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post #30 of 39 Old 06-27-2014, 08:02 AM
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Quote:
Originally Posted by mopartech View Post
Ok, thought we were talking jeep wrangler engines here, I can see that you are a guy who always as to be right...so your absolutely correct in the torque numbers. I would never personally rate the 4.7 in the top of any engine comparison though, it is a very complex and troublesome engine.
Thread title is "Best and worst engines ever from Jeep".

I wouldn't rate the 4.7 as one of the best either, I was just using it to make the point that the 4.0 is not the torque monster that some people will lead you to believe.

The 4.7 makes more torque at 1,200 RPM than the 4.0 does at its peak. And this is from a small V8.

I'm not a big fan of the 4.0 I6. Not enough power.
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