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Unread 12-12-2010, 12:01 PM   #16
Nick_Knipp
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1986 MJ Comanche 
 
Join Date: Oct 2010
Location: Warner Robins, Georgia, Georgia
Posts: 1,982
doubfully, the AMC engine was a favorite for over 40 years. they stopped making it cause its power was maxed out and cause of lame emissions laws.

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Unread 12-12-2010, 12:13 PM   #17
SuperRliBerty
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Quote:
Originally Posted by alex725 View Post
This thread does not make any sense at all to me, maybe Im missing something? First its talking about the 3.6 pentastar and then it shows a pic of the 4.0 thats already in service, in the nitro and minivans.
Yes, I put a question mark. By mid 2011, I am hoping chrysler put the 4.0 in the Jeep liberty. Jeep only has 4 engines choice. The 6.1L 392 hemi will be in the Jeep SRT
lb_engines_com09.jpg   dodge-challenger-srt8-392-2011-engine-view.jpg  
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Cold air intake*Trush (magnaflow) turbo muffler* Hypertech power program*
Hood Prop mod. Battery Quick Release mod.
Resonator removed (sounds like a V8 on start up)
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Unread 12-12-2010, 12:16 PM   #18
richd
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The Liberty as we know it will die with the 3.7,Not sure whats going in when it becomes a Fiat Liberty.
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Unread 12-12-2010, 12:35 PM   #19
SuperRliBerty
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Quote:
Originally Posted by Nick_Knipp View Post
doubfully, the AMC engine was a favorite for over 40 years. they stopped making it cause its power was maxed out and cause of lame emissions laws.
Yep, emission laws ran it into the ground..



4.0L I6
The 4.0L inline 6 (I6) engine was introduced in the Cherokee in the late 80s and in the YJ in 1991. The cylinder design is based on the changes made to the fuel injected 2.5L I4 engine. The block and cylinder head are cast iron. It uses 7 main bearings and hydraulic lifters. The HP and torque gains are substantial over the older carbureted 258, but the peaks come at higher RPM. The fuel injected engine performs much better in off-camber, bouncy, and steep situations. It also calibrates better for changes in altitude. Fuel economy is also improved.

A good way to embarass yourself in front of your Jeeping friends is to refer to it as a V6. It isn't a V6, it is an inline 6 or I6. The "V" in V6 refers to the configuration of the pistons in the block. The only two V6 engines ever available from the factory in a Jeep are the 225 "Dauntless" Buick V6 in the late 60s and early 70s and the 2.8L GM V6 in 80s Cherokees and Comanches. If you are shopping for a Cherokee or Comanche, make sure you get the 4.0L and not the 2.8L engine, there is a world of difference.

The 4.0L engine used in the Wrangler from '91 until the present.

4.0L I6
Bore x Stroke 3.88" x 3.41"

Displacement 242 (4.0L)

Compression Ratio 8.8:1

Horsepower (net) 180@4750

Torque (net) 220@4000

Main Bearings 7

Valve Configuration OHV

Fuel MPI


The 4.0L I6 that is used in the XJ and ZJ is rated slightly higher than the YJ and TJ 4.0L engine probably due to a different exhaust system.
dsc00848.jpg  
__________________
2008 Sport Liberty
Cold air intake*Trush (magnaflow) turbo muffler* Hypertech power program*
Hood Prop mod. Battery Quick Release mod.
Resonator removed (sounds like a V8 on start up)
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Unread 12-12-2010, 05:44 PM   #20
armedsks
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Ive been very happy with my wifes 3.7 V6. What kills the liberty is the old 4sp auto and the 3.73 gears.

Wish she would have got the 6sp manual they offerd in 08. Would like to see a 5sp auto and some 4.10's
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Unread 12-12-2010, 10:32 PM   #21
Nick_Knipp
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Location: Warner Robins, Georgia, Georgia
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agreed, they need to renew the trans and gears. theyve been using the same thing over again with the XJs, ZJs, WJs, etc etc
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'86 MJ XLS 4x4 2.8L 3spd longbed buckets
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