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Unread 07-26-2010, 04:56 PM   #1
xj_army
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1999 XJ Cherokee 
 
Join Date: Sep 2009
Location: Ft. Knox
Posts: 434
XJ Cam?

I have a basically stock '99 with the 4.0 and Im wondering if it would be worth a cam upgrade when I have my top end redone. Thinking of having my valves redone and been thinking of redoing the cam, rockers, rollers, and lifters and anything else needed with a cam install. Not really sure what all is needed and if anyone could find or knows of a good kit and what kind of cam I would need for the 30-40 hp increase (mentioned in another thread), I would greatly appreciate it. Id kinda like the cam to give it a good lope if possible.

Im also wondering if my cylinders are in good condition, would I have to have them honed to put in new pistons? I know on quads if the head is in good condition on a 4 stroke, you can sometimes get away with it. I dount mine is just because its old but just for sh*ts and giggles would I be facing problems with new pistons and rings(possibly high compression) without honing my cylinders.

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Last edited by xj_army; 07-26-2010 at 05:22 PM..
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Unread 07-27-2010, 05:44 AM   #2
mdm
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2000 TJ Wrangler 
 
Join Date: Apr 2005
Location: Elkmont, AL
Posts: 9,715
Don't just throw new pistons and rings into the holes. At a minimum you would need to hone the cylinders for new rings. You may very well need to bore for oversize pistons. You can't go by the fact that you may still have visible hone marks on the walls and think you can just put the new rings and pistons in. At 175K my cylinders still had very visible hone marks but when I measured the holes there would have been too much clearance for the stock piston.
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Unread 07-27-2010, 07:16 AM   #3
xj_army
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1999 XJ Cherokee 
 
Join Date: Sep 2009
Location: Ft. Knox
Posts: 434
I figured. I just know that with quads u can sometimes get away with it but I do realize too that this isnt a quad. Just wanted to check and make sure.
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Unread 07-27-2010, 07:31 AM   #4
ajmorell
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Join Date: Jan 2006
Location: Santa Fe, New Mexico
Posts: 7,144
Call Comp Cams or Crower and talk to them and tell them what you want. I'm running Comp 68-232-4 but I wish I would've had a cam custom ground for a little more money. Between the cam, 99+ intake, head work, and exhaust there is a pretty substantial difference compared to a stock 4.0 but I wish the cam I ended up with had a little more low end grunt.
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