dookie454

Wasnt really sure where to post this, so i'll try this one..

http://www.mediafire.com/download.php?j2un3jddtzj UPDATED LINK - Have to open it in Quicktime, Winamp and others wont play it.

Im attaching an audio file, it plays using Quicktime (doesnt play in my Winamp). I have what sounds like one lifter ticking madly away,
If anybody wants to chime in I'd really appreaciate it. Didnt know where else to post this but saw other Comp Cams 875 posts in here.

There's about 6800miles on a 383 Forged rebuild and about 7psi and 6200rpm rev limited only recently moved up to 9psi. Ticking is getting worse and worse as miles rack up. When I drive this car Im usually always into the throttle at least 2 times out of a trip, so it's beat on everytime I drive it .
It really only does it when warm, and worse at idle than anywhere else though around 2100rpm when oil is nice and hot I can hear it decent inside the car.
Oil pressure is about 30-40psi at idle undess real real hot.
It ticks worse as the oil gets hot.
Sounds like it's near the middle of the d-side bank, so maybe cyl 5? Sounds like it's under the valve cover but seems just as loud from underneath.
It doesnt do it when oil is cold, thought this morning I did hear it before oil pressure built up which is rare... thinking it's getting worse real fast.
Right now it has 5w 40 Rotella Synthetic with about 1500 miles on the oil.
Changing to Trick Flow guideplates did not do one thing
Adjusting rockers when running did not one thing either.
Cam is 230 intake, 234 Exhaust. Lift equates to 0.564" Intake, 0.576" Exhaust using 1.6 ratio CCA-1302-16 Rockers.

I havent had the intake off yet but all the rockers, valves, pushrods look great and it runs perfect, Im worried this ticking could turn into a blown motor if a lifter falls apart and creates a mess.

I dont know what version 875-16's I have as I didnt take a picture but I think I bought them around 2007.

Any helpful advice, should I immediately stop running it?
I think AI reccomended these rockers during the intial build: GM 12371042 Hi-Performance Roller Lifter Kit

Thanks everybody

Cook Performance

Couldn't load your audio file but i also like the GM performance lifter kit. We use them all the time.

I know comp recommends only a 1/8-1/4 turn of preload on those lifters, so you need to adjust the valves with the engine not running.
You need to get the 875 "R" lifters out of your car. I have personally had one fail on me and we have not installed them for over a year.
Feel free to contact me for the purchase of the kit or if you have any questions. We run the GM lifters at 1/2 turn.

Jacob Cook Cook Performance Engines www.cpengines.com 765-352-3626

boosted-lt1

I was not able to hear the file.

dookie454

http://www.mediafire.com/download.php?j2un3jddtzj

I updated the link not sure if it changed, but it plays with Quicktime (right click choose open with Quicktime).

It's pretty noisy and is why I dont think it's normal.

dookie454

Thanks, that's the answer I was looking for. Advanced Induction also recommended the GM kit. I was trying to save $30 and went with Comp.

Lash was done every way, not running, 1/4-3/4 turn, then running just to see if it helped.. .nothing helped.

Can you post a price or PM it to me with shipping to 48326? Thank you.

MichiganSkip

Guess again sunshine. straight from comp's website ZERO TO 1/8 TURN. Where do you guys get your info?

http://www.compcams.com/v002/Instruc.../COMP4-115.pdf

MichiganSkip

I suspect that you may have contributed to the demise of your lifters by adjusting them too tight to begin with.

http://www.compcams.com/v002/Instruc.../COMP4-115.pdf Zero-1/8th turn right there in bold lettering.

dookie454

s-willis should read further and post the entire link: "Through various testing we have discovered that lifter preload should be set between zero and 1/8 of a
turn for optimal performance"

Performance meaning HP and longevity/reliability/integrity of a lifter are completely different things.

Yes, optimal preload does create optimal HP, that's not what this post is about. There is no way turning lifter preload to 1/4 turn rather than 1/8 turn can cause harm to the lifter unless it's junk.

MichiganSkip

dude, I'm not trying to flame you, and I understand that you had the noise before you started adjusting lifter preload. I was just pointing out something I read in post 5. You stated you adjusted them 1/4-3/4 turn. I have those same lifters. When I first installed them at 1/4 past zero they ticked louder than I thought they should so I did some searching and one of the moderators on here told me that Comp says they are supposed to be set at .002 which amounts to about 1/16 past zero. I then called Comp and they said the same thing. I would think that if comp says to adjust them a certain amount, they would know . Sorry if I upset you, I certainly didn't mean to.

dookie454

More awesomeness from COMP CAMS! They installed TWO retaining clips on one of my lifters as seen in the first picture (and they are the weak ones at that) !!! HAHAHAHAHHAHAH. How will a Pro-Comp Cam person explain that one? Looks like the plunger is sitting much farther down as a result since the clips are all jamed and bound up. I have to say that is pure quality there.

The other lifter has a cracked retainer, big suprise there.

So, I hope my lifter tick is somehow due to one of these two lifters which were both in the area of the noise.

Because of this I feel Comp Cams suck either way. Why use these when you can have extra insurance using others? Basically from everything I've read if you use Comp Cams and they dont break, your lucky. Simple as that.

Double Clips!! (must be for extra strength incase one breaks? What a joke):


Broken Clip (not sure how that happens when they are pre-loaded slightly more than recommended)???


ADDED 6-9-09: Side by side comparison of the GM vs Comp Cams lifter. How can anyone say 1.5grams is worth 1/2 the cup depth and 1/10th the clip thickness? Rediculus.


Comp Cams 875-16 R Pro Mag Lifter: 121.67g
GM Perf Parts GM# 12371042: 123.19g
Difference of 1.52grams

wrd1972

Call em' up. They have great customer support and will likely replace them.

dookie454

Thanks, Im calling them you can bet on it!

I added another picture comparing the GM vs Comp Cams lifter to my post below, how rediculous is the shallow cup AND the thin metal clip? I could maybe see one or the other but definately not both since the shallow cup invites all kinds of problems and a thin clip helps ensure the problems are forever remembered.

Seems like the last thing you'd want to do when your lifters weight in at 123 grams, shave 1.5grams off by sacrificing reliability. Ah well at least we know what the problems with the 875-16's are.

Comp Cams 875-16 R Pro Mag Lifter: 121.67g
GM Perf Parts GM# 12371042: 123.19g
Difference of 1.52grams