O.K. I did a test if you's remember awhile back with my car and the Comp R valve lash test. I set mine at zero lash and left it with my Self aligning 1.6 RR's. Seems to be the best for my set up as per other thread about the test. Now I am working on my friends same year Z and I installed the Comp R lifters but with Comp Pro Mag non-self aligning RR with Guide Plates. I set them at ZERO lash and the car fired right up. However my buddie noticed after we shut the car off that the RR's that were not on the up stroke of the cam lobes,were very sloppy. For reference I pulled my cover off my Z to see if it is the same and no it is not. Mine seem to be fine with just a little bit of side to side play. Now my buddies car has side to side play and up and down play..... more than I think is right. The car starts up nice with that nice compression sound when it cranks over and all. So then I went 1/8 turn past Zero Lash and the car seemed Idle a bit better and turned over with that nice compression sound again. But when I shut off the car those RR's still have a lot of up and down (Rocking Motion) play... So I contacted my local performance shop and they said try going a 1/4 turn past Zero Lash. I did it and the car seemed to turn over like the valve lash was too tight, like it lost some compression. Let it idle for a bit and shut of only to find once again that the RR's not on the cam lobes up stroke were still very sloppy. Why are mine O.K. but these seem too loose? I am afraid of the pushrod comming out of the pocket on the RR the way it is. I tried to push one of the pushrods out of the pocket by hand and could not do it so I don't think it will come out.... My performance shop is going to contact Comp to see what they say tomorrow.. Maybe my Comp R's are nice and pumped up after running if for a few hundred miles and his may still need to be pumped up? Don't the lifters have a spring in them to keep them up? I am a bit confussed... I will set them back to 1/8 turn past Zero Lash tomorrow and take it for a cruise then check them again..... Any info would be great on this. Seems these Comp R Lifters are just a crap shoot for us that are running them...

Sorry so long and thanks in advance..
Eddie

 

What valve springs are on the car with the problem?

 

Not sure. They were insalled by Loyd Elliott as he was the one who did the head work. They are dual spring.. Not sure what brand.

 

I was just wondering what the spring pressures were. I would feel confident that Lloyd did not put anything on there that would be too extreme for Comp R lifters. If the lifters have not been in long, maybe they are not well filled with oil. I have no idea on whether they were well oiled before install or how the oil pressure is now. Perhaps they need a little more run-in.

I guess rocker geometry looks ok, too?

 

I had the lifters soaking for about 1 month in a tub of oil. I think maybe a little more run time is definately a posibility to solving this.
I'll keep you posted...

 

i've kind of noticed the same thing on my Z. My lifters have been in now for only 1 day though.

 

A month...well, that should be long enough.

 

Back to the top. Shoebox, the springs are CC 987's, 130lb. closed and 350lb. open at .600 lift. It's a small Joe O. cam. We used the proper guide plates, along with CC HiTech PR's. The studs are 7/16's, as I was trying to use the best parts for the job. I realize with the tread pitch of the 7/16's is a little more tricky for adjusting the rockers but I'm sure Eddie had it right the first time. The PR's are standard lenght, altho the heads were cut .010, and were useing Impy gaskets. I was told this would be OK, but no, neither one of us really gave a good look at the contact point of the valve. It seemed OK but I really didn't give it that hard of a look. Do you think this might have something to do with it? Anyone have any ideas? Thanks for any help with this problem. Rick. The guy taking up way to much of Eddies time, and garage space.

 

I'm actually running into the VERY same problems, with a very similar setup:

Big Joe O cam
XE 618 springs (@1.8" = 150# on the seat, 350# open @ .600")
7.2 pushrods (geometry checks out)
heads milled .014
Fel-Pro gaskets

Just signing up to see if this goes anywhere.

 

i am running mine pretty much at 0 lash with no problems.
Marcin

 

Fastbird93,
That sucks, J/k. I was just about to do a search for your post on the same subject to find out if and how you cured the same problem. But maybe this isn't a problem, maybe as long as the PR's don't come out of the rockers the oil pressure takes the slack out and everything is fine. Or maybe it's just wishfull thinking on my part. Any idea how deep the pocket is that the PR fits into on the rocker arm? Eddie says that he can fit an .020 feeler gauge between the rocker and the valve. Anyone else have a clue how deep the recess is?

 

Ok, I don't know if this is going to help you out, but the information in the following post was of assistance to me:

http://web.camaross.com/forums/showt...10#post2443810

Coming from a guy who does tuning, it's a safe bet I'm looking ok as my motor has VERY little run time on it because of various issues, but once things are heated up everything settles down.

 

Fastbird93,
Every little bit of info helps and I thank you.

 

Tough diagnosing all these problems.

One thing is to start with the basics. Check the valvetrain geometry and correct it as needed. If it's not "correct" then you need go no further til it is.

Also, what do the lifter bores look like? Sounds crazy but an oval lifter bore or one that has excessive clearance (lifter OD to bore ID) is gonna cause you problems. With practice, you can do a good check with a telescoping gage (aka snap gage) on the lifter bore, mic your findings then compare that to the lifter OD. Don't know about the Comp R's but the quality of lifters (mainly flat tappet) really took a dive after that shortage here a year or so ago. They just aren't up to the same quality/tolerances. Haven't used an "R" in three years so...

With geo correct and no lifter bore problems (noticable anyways) you just need to make sure you're setting the lifters on the base circle. A lot of people goof up here. I had a friend of mine call me here a while back said he was having problems, swore up and down that he adjusted them correctly, went over and adjusted them for him and wallah!.... no more problems.

I'd rather be lucky that good any day but I'm thinking he didn't have them adjusted correctly.

-Mindgame

 

As Mindgame suggested, the adjustment procedure could be key. With a big cam, it may be harder to judge when you are on the base of the lobe. Using the individual adjusting method (#3 on my page) while watching the opposite valve position may be best.