05 Engine Changes

[loves_off_roading]

On the Allpar website I noticed that the 3.7L engine received a couple changes in 05. It got a new cam profile, lash adjusters, rings, and a 9.7:1 compression ratio.

Just wondering if you guys think that these changes affected the engines long term reliability?

 

[AlexKJ]

In 2005, the 3.7 engine was treated to numerous economy and idle-quality changes, with a new cam profile, lash adjusters, rings, and a 9.7:1 compression ratio. The cam profile change, IF that means timing change, would change the torque curve, that's all.

Compression ratio
- 9.1:1 to 9.6:1
- 210hp to 211hp
- 225 ft/lbs to 236 ft/lbs
- valve timing (only lists duration in degrees, no lift):
* intake - 236° to 245.7°
* exhaust - 250° to 261.6°

All above is another reason that newer 3.7's have more issues then the older 3.7's.Longer duration equals more stress on the valve train.

And a lot more discussion in http://www.jeepkj.com/forum/showthread.php?t=41083&page=2

Have fun