PDA

View Full Version : Replacement camshaft


BCKNBLK
September 15th, 2017, 11:36
On a 2001 Cherokee 4.0, Im looking to replace the camshaft as part of a rebuild. Any suggestions? Its not a stroker, just a .030" overbore. Might have the head 'gasket matched' but not going serious, just to get the engine to breathe a little better. Im not planning on changing/reflashing the computer, no performance chip, etc. Just looking for a better than stock cam. Thanks

cal
September 15th, 2017, 15:12
Not a simple answer for such a simple question.

Call Russ @ Bishop Buehl and talk with him. He'll have good advise and also has several custom cam grinds you may find favorable.

Bishop-Buehl Racing Engines
Work (626) 967-1000
Fax (626) 967-7836
Cell (626) 673-2203

sidewaysstarion
September 15th, 2017, 15:18
There's two options, run with stock valve springs or upgrade the valve springs and run a more aggressive cam. Also does it have to pass smog or not?

Green XJ Jeep
September 15th, 2017, 17:47
Keep in mind you can't go over .450 lift with stock springs
http://www.angelfire.com/my/fan/Jeep4.0Camshafts.htm

BCKNBLK
September 15th, 2017, 19:11
It DOES have to pass a smog test, and I was not planning on using stiffer than stock valve springs, so understandable I would not be going much bigger than stock. And yes, the question has come to mind 'Then why do it'. But, just looking to see if anyone had suggestions and a brief description of how good a particular camshaft worked for them. I know the variables are endless and its a difficult question to answer, just thought I'd throw it out there. I cannot go too radical that the factory computer cannot manage it properly, I guess Im looking to just bump up the duration and lift a bit from stock, since this is the time to switch cams now that the engine is apart. Thanks again!

cal
September 15th, 2017, 19:21
The factory computer can handle a lot more than you'd expect.

Russ @ Bishop Buehl puts out 15 or so performance 4.0 and stroker motors a month, and has a dozen or more cams that he uses. He can give you very solid info - whether you buy from him or not (but his prices are pretty damn good too).

I'm sure he'd be happy to give you 5-10 minutes of his life, but he probably won't stumble onto this post in a timely fashion.

RCP Phx
September 15th, 2017, 20:52
I've been extremely happy with my Comp Cams#68-232-4 !

BCKNBLK
September 15th, 2017, 20:55
That's definitely good to know about the computer being able to compensate. I'm sure that the injectors have a little wiggle room as well, I'm not really worried about it because I'm only planning on going up a tad in size. I will definitely give Russ a call, thank you for the information!

RCP Phx
September 15th, 2017, 23:36
Russ is who suggested the Comp Cam!

BCKNBLK
September 16th, 2017, 12:46
Excellent! I just got your link and checked out your write-up. Pretty impressive. I really miss having a garage, and being able to build something up myself. In an apartment right now and so far getting away with what I have has been a blessing. The block and head are still at the shop, I was going to call them today to see where things are at. I asked them to measure the cam to determine its wear and go from there, but the more I think about it, I should just replace the cam to something better since I'm already throwing new lifters at it, I'll just get a cam kit (with lifters and pushrods) to keep it simple. I also have to deal with the rdiator. I nicked the core during the pully removal, so Im going to upgrade that. It was a stock single core Mopar unit. Id like at least a two-core replacement to handle this heat, and the guys at Performance Radiator recommended a CSF unit through mail order. At the same time, Im thinking about a dual electric fan set-up, prefferably something as drop-in as possible. Like I said before, no garage to fab stuff right now. Any thoughts and/or suggestions on anything?

RCP Phx
September 16th, 2017, 15:52
Who did you end up taking the block and head to? What about the crank and rods?

chasdb
September 16th, 2017, 19:06
Don't bother with a dual electric fan or a triple electric set up.

David_Bricker
September 16th, 2017, 19:31
Don't bother with a dual electric fan or a triple electric set up.

^This. Been there, done that, ripped it all out. Stock 97+ mechanical and electric fans, ZJ standard duty fan clutch. Call it a day.

David Bricker / SYR

BCKNBLK
September 17th, 2017, 11:56
Thanks for the advice on the cooling system stuff, Im pretty sure at this point Im going to stay with the stock setup because everything is working just fine. I replaced the clutch fan assembly about six months ago and would like to get a little more use out of it. As far as the radiator, well, it has to be replaced anyway, and after speaking to the Performance Radiator guys, Im just going to get a CSF two-row metal tank replacement and drop in it.

BCKNBLK
September 17th, 2017, 12:02
I dis-assembled the engine myself to evaluate. After measuring the cylinders and realizing it needed to be bored, I had the Jeep towed to Sundance Auto and Machine. They were recommended by the guys at Valley Spring. It was a crapshoot since I havent been here long enough to know who is who, but after consulting with them several times first, they seemed knowledgeable and experienced. Im keeping the faith and time will tell! I'll talk with them tomorrow to see where they are at.

BCKNBLK
September 17th, 2017, 16:42
RCP Phx- Have you been able to pass emissions testing with that Comp Cams 68-232-4?

RCP Phx
September 17th, 2017, 17:09
Yeah, I did that about 3d days after the build, my plates were overdue since the build took so long!

BCKNBLK
September 17th, 2017, 19:25
I just spoke with Russ, what a nice guy, and what a wealth of information! I think for this particular rebuild, I have a good plan of action now, especially concerning the cylinder head. I've got a little searching to do, have to find a TUPY head in one of the boneyards in the valley here. Any suggestions on where to start?

RCP Phx
September 17th, 2017, 19:57
Definitely not easy to find and your head is already at the machine shop! What did Russ guide you into? Since your block is already being machined it impacts your piston choices also.

BCKNBLK
September 17th, 2017, 22:36
From talking with Russ, the impression I got was that the TUPY head was a direct replacement, albeit an upgrade in that it didn't seem to have cracking issues, used on the 4 liter engines after 2001. He did not mention anything about how this head would adversely affect the shortblock (pistons) I was going to be using. We directly discussed how if I were to get ahold of one of these TUPY heads, I would use it on my application. I can double check with him just to confirm its use, that might be the safe thing to do, but my thinking is that if it came from a 4 liter engine from 2002-2006 and had the TUPY casted in the spots he indicated, I should be safe.

RCP Phx
September 18th, 2017, 08:19
The Tupy head is the replacement for the OE 0331, but they are hard to find other than new. The head does not impact the piston choices. What I was trying to say was that you need to have your pistons before you do any machining on the block!

RCP Phx
September 18th, 2017, 10:13
I bought a new "complete" head from CCH, they have their version of the TUPY head.
https://www.amazon.com/BRAND-CHEROKEE-LAREDO-CYLINDER-HEAD/dp/B014E3RN9Y/ref=sr_1_1?ie=UTF8&qid=1505748960&sr=8-1&keywords=clearwater+cylinder+head+for+jeep+4.0

BCKNBLK
September 18th, 2017, 13:05
I spoke with the machine shop this morning, and the head was already finished. He was well versed in the issues of this casting and performs a lot of extra time in NDT with these to ensure he is not returning a cracked head to service. He complimented me on mine, saying that it was in quite nicer shape than hes used to seeing when it comes to Jeep heads, and it also did not require any base milling, so thats good to know. Im not so worried about it, as Im very attentive to my driving situation and the gauges. Im one of those nuts that checks the oil, tires and tranny fluid religiously. Anyhow, the shortblock is coming along nicely, and they are waiting for the cam, so as soon as I can get it they can continue.

RCP Phx
September 18th, 2017, 13:46
I take it your having someone build this for you? Again, what about the pistons and connecting rods?

BCKNBLK
September 20th, 2017, 02:45
Yes, I said that I disassembled the engine myself, in the parking lot of the apartment complex in which I live. Measured out the cylinders, found that they were at or just past the out-of-round limits stated in the FSM, so then had the Jeep, with the block still installed, towed to the machine shop. So far the bottom end is coming along fine. They are waiting for the cam to show up.

Green XJ Jeep
September 20th, 2017, 07:26
Which cam did you decide on?

chris420
September 20th, 2017, 19:07
I will send you part number from Rattle Snake Cams give 50 more ft pounds trq will send when I get a chance to find it.

BCKNBLK
September 20th, 2017, 23:26
Russ P. hooked me up with a special grind he's got from Comp that he says works really well with the basic 4 liters, and since this is not a high performance type rebuild, I will not have to go with stiffer valvesprings. Not that I had anything against it, but I just have a new set of slightly better-than-stock springs on the way (from Russ also) that I will have installed on the head, and will work just fine with the cam.