3.8L Engine Build
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Joined: Jul 2007
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From: New York
JK Enthusiast
Joined: Oct 2010
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From: Port Deposit, Md
Originally Posted by RIPPMODS
Really - we've competed over 60k miles all supercharged with a 12psi pulley and 365 dyno pass's at full throttle.
We think their rather strong - Have you been through a JK's 3.8?
RIPP TECH
RIpp, can you give any info as how good of quality are our stock engine parts like rods, pistons, bearings, crank? Is there any manufactures that you would recommend to upgrade such parts?
Me personally I would more than love to pit on one of your superchargers but want my engine (which drinks oil like a fish) to be sturdy enough to handle it without fear tearing something up and totally ruining the motor.
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JK Freak
Joined: Apr 2009
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From: Grande Prairie, Alberta
Originally Posted by RIPPMODS
Really - we've competed over 60k miles all supercharged with a 12psi pulley and 365 dyno pass's at full throttle.
We think their rather strong - Have you been through a JK's 3.8?
RIPP TECH
I'm not saying anything bad about your supercharger actualy if I could afford it my jeep would have one
But there is no denying this 3.8l is a peace of junk... So many people have had their engines replaced around 50000km it can't be denied.
Last edited by Jeep Hound; Feb 1, 2011 at 08:24 PM.
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JK Freak
Joined: Apr 2009
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From: Grande Prairie, Alberta
Originally Posted by betjeep09
Bio-diesel?
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JK Freak
Joined: Apr 2009
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From: Grande Prairie, Alberta
Originally Posted by FlyinSquirre1
3.8's are bored/stroked from factory (originally 3.3l) so the walls are thin already. They retuned from minivan specs for a better torque curve than the 4.0l inlines. I'm willing to bet this has a play in the reliability issues we're having. As far as better performance I believe there is not much that can be done mechanically. Maybe deck the heads to bump compression? But that kills even more reliability. Maybe rethink valve lift/duration? Otherwise I'm thinking retune fuel delivery, open the throttle body up, smooth air delivery altogether (cai), smooth exhaust (headers/catback) & basically just maximize efficiency in all subsystems.
It all seems sketchy to me because I am living proof of the horrible reliability of this engine design, 43k miles and the engine blew up. Regular oil changes and zero mods. It doesn't add up, unless of course you count the price of the engine, and labor to replace it, that I just got. :/
Nick
It all seems sketchy to me because I am living proof of the horrible reliability of this engine design, 43k miles and the engine blew up. Regular oil changes and zero mods. It doesn't add up, unless of course you count the price of the engine, and labor to replace it, that I just got. :/
Nick
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JK Freak
Joined: Apr 2009
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From: Grande Prairie, Alberta
Originally Posted by JPop
That's really about it that isn't going to be too intrusive as far as the engine internals go. 0.025" is about as far as I would go, and I understand that at 0.040" you would really be at the fringe of asking for trouble.
As for myself I'm just going to wait out the Pentastar for the 2012s. It isn't going to be a head over heels improvement, but should knock down the operating rpm range by 8-15% with the same power and better torque.
JK Jedi Master
Joined: Feb 2008
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From: Maine
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JK Freak
Joined: Apr 2009
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From: Grande Prairie, Alberta
Originally Posted by ronjenx
I would like to see the numbers (% of bad engines) for the JK 3.8, compared to other makes.
JK Jedi Master
Joined: Feb 2008
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From: Maine