The Mud Pit > Wrenching
TJ headpipe in a YJ
kirksjeep:
I've been looking for a TJ part out so I could grab up some parts, and I hit the jack pot today. A guy up in Plainfield is doing a V-8 conversion for a guy who had a 4 cylinder and blew the engine because he was pushing 36's and towing a jet ski to the mall. He sold me the complete head pipe with the cat and both O2 sensors for $25!!!!! I can sell the cat for at least $50, and I'm sure I could sell the O2 sensors for a couple of bucks too since the connectors are different then my YJ. The 2.5L and 4.0L used the same head pipe from 97-99.
I'll probably start this next week, since I'll be out of town this weekend. My question for the TJ guys, is the mini football thing on the front of the pipe a resonator or is it a small cat? I'm thinking of just cutting it out and welding in a straight chunk of pipe, but is it worth the effort? I know I'll have to cut a few slices in the pipe and bend it a little to match up to the YJ cat, but I don't think it should be too hard. The only other hurdle I expect is I will have to lengthen the wires for the O2 sensor, but that shouldn't be too bad.
For the non-YJ guys , the reason this is a worth doing conversion is on a YJ the head pipe goes under the bell housing of the tranny and hangs fairly low. Mine has several good size dents that I can feel are reducing the power. Plus when I make an engine skid I can tuck it up a little higher.
Tsunami:
if you want, i can swing by and you can take a look at mine
Axle:
Starting from the manifolds, each one has a cat, then they meet the head pipe where there is a resonator, then the muffler, and so on.
BayouGold:
...& the thigh bone connects to the knee bone, & the knee bone connects to the shin bone. sorry, couldn't resist. ::)
kirksjeep:
--- Quote from: Axle on June 23, 2009, 10:07:23 PM ---Starting from the manifolds, each one has a cat, then they meet the head pipe where there is a resonator, then the muffler, and so on.
--- End quote ---
The 97-99 collect in the manifold and then enter the head pipe. The 00 and later have two connections at the head pipe/ manifold. I did a little research and it is a cat, but it is a low restriction set up. The pipe goes from 2 1/4 prior to the mini-cat to 2 1/2 after the mini-cat. Everything I have read about these is that they are not worth the effort to cut out, since they shouldn't change the performance. The 99's are the first year for these mini cats.
Here is a link to a write up of the YJ problem and the TJ install.
http://www.virtualjeepclub.com/showthread.php?t=9091
This one doesn't show the mini cat, but it would be at the leading edge of the oil pan.
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