Originally Posted by Jerry Bransford
I have wheeled and known a guy (Robert Yates) almost since buying my first TJ in '96 who installed a stroker into his '98 5-6 years ago. Our local crowd then followed for years all of his ongoing and continuous problems he had trying to get it to run right... computers, reprogramming via chips, higher flow fuel injectors, etc.. And he's a bright guy with such stuff, he just had major issues getting it to run right. It even ran too hot and that was with a lot of extremely knowledgeable help on his cooling system. I'm not so sure it's running right for him this day though he drives it.
Jerry, Robert doesn't have a stroker.
he's got a stock 4.0L bore with Hesco cam, high performance valve springs & a Hesco aluminum head. he advanced the cam 4 degrees upon install. he uses a Unichip for the tune. i think he gets 27 hp over stock.
Linky: New cam quote from Hesco - Page 4 - JeepForum.com
Originally Posted by rubicon hobby
Thanks Jerry your input is always welcome I am leaning toward a stock 4.0 they are cheaper and seem to pull just fine Having built hot rods I know that they need constant tweaking and this Jeep gets enough tweaking as it is LOL, so stock is probably the best bet for my DD.
A stroker can be just fine if its built properly. You've got to put a lot of time looking at the deck height, pin height, dynamic compression ratio, etc. The key is building it properly. Lots of shops forget to lube the cam right, and you end up blowing up the cam on initial startup. Sometimes shops don't know to install special valve springs with high performance cams, and you blow up the cam after a few thousand miles. The other problem is oil these days doesn't have enough zinc, as mandated by the EPA. These motors need lots of zinc in their oil since they use flat tappet lifters. You need to use a ZDDP additive in the oil, or you'll wreck the motor.
Golen has all that worked out. Given them a call and talk to them, they're very friendly folks and know 4.0L's inside and out very intimately.
Heck Mopar now sells a 4.7L stroker...and they actually did some R&D on it. If Jeep sells a stroker replacement for the 4.0L, it can't be a completely crap idea.