Jeep CJ7 4.2 with 4.0 head compcams 68-239-4
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- Опубликовано: 18 сен 2024
- First start of the engine after break in.
4.2 block with 7120 4.0 head 202 in 154 ex valve and compcams X4262H Part No. 68-239-4 Lobe sep 111°, intake CL 107°, lift 0.493 in and 0.512 ex, @50 218 in and 224 ex
Engine configuration
Block decked 0.040
Head milled 0.030
Theoretical compression 10.1
Cam degreed at 106.25°
470 holley avenger
Clifford performance intake and exhaust manifolds
True Dual Exhaust with magnaflow tru-X muffler 2 1/2 inch all the way.
hmm very nice tank's for the share you'r jeep is gorgeous
You got some wicked valvetrain noise. I have a similar build listen to mine. Did you use the 4.0 pushrods? If not get some
yes I do have some valve noise. When I started the engine the 2 lifters where giving me problems. Then I used pushrods the where pushing in the lifter 0.030". When I called comp cams they told me to go closer to 0.050". I did but still the cam makes the sawing machine noise. I called comps again and they told me is normal for the Xtreme Energy cams to do such noise. The 2 lifters that I was having problems with I still have the problem and just the thought of having to remove the head again is killing me. Other than that the engine has so much power that is incredible.
If you don’t want to take the head off-remove the valve cover and the rockers and push rods. Drain the oil and pull the cam with the head on. The lifters will drop into the oil pan. Pull the pan off and the oil galley plug in the front of the block by the cam slide you’re new lifters into the bores from underneath and slide a sizeable dowel I use a bamboo rod under each lifter as you put them in. Through the oil passage hole. Once you stab the cam back in pull the dowell back out and the lifters will drop in. I find it easier to pull the oil pan than the head.
With the new lifters make sure to use break in oil. And don’t just change the two if you do it this way because you won’t know what lobes they were on. I used lifters from PBM and had great luck. Erson cams brand. Good luck.
how much timing and rpm did you set the idle? it sounds very smooth compared to other jeeps with the same cam
12 Deg initial 32 total
No way its that cam
What valve springs are you using I bought the cam Cam Kit the valve springs fit but the retainers don't match up to the valve
I used Howard Cams springs and retainers. I called CompCams and I asked what was the required open spring pressure, installed height and closed spring pressure. Called Howard Cams and purchased what I needed
I'm running the exact same setup I put a Comp Cam in and same number that you have in my engine but I was using stock push rods and rockers and I keep breaking lifters this is the second cam all ready and I was using Comp cams springs that came in the kit
What valve springs did you end up using
I end up using the compcams springs that comes in the kit. Spring part number from compcams is 926-12
@@fernandodelvalle1612 what valve spring retainers did you use
When I purchased the kit came with all accesories for assembly. COMP Cams Xtreme Energy 4x4 Cam and Lifter Kits part number K68-239-4.
Now to answer to specific question the valve spring part No. 744-12 and the valve locks part No. 603-12
What springs and cam? What headers did you use?
7120 4.0 head 202 in 154 ex valve and compcams X4262H Part No. 68-239-4 Lobe sep 111°, intake CL 107°, lift 0.493 in and 0.512 ex, @50 218 in and 224 ex
. Springs compcams part number 926-12, but I purchased the whole kit that includes, springs, spring plates, retainer, cam chain, lifters
Engine configuration
Block decked 0.040
Head milled 0.030
Theoretical compression 10.1
Cam degreed at 106.25°
470 holley avenger
Clifford performance intake manifold and exhaust manifolds
True Dual Exhaust with magnaflow tru-X muffler 2 1/2 inch all the way.
What lifters and push rods are you using
Lifters are the matching ones for CompCams. Pushrods where measured to fit and I bought them from Summit racing. The brand is summit with a 0.80 wall. In that particular video that pushrods are not fully adjusted. That is why they chatter.