CHADsterss

Mine are quite as hell

speedtigger

iTrader: (16)

LMAO!!! Oh man. Some seem to interpret the idea that they did not have lifter noise means that that they are an expert.

edwardzracing

iTrader: (59)

I can't help but ask, but just out of curiosity... what makes you certain that these lifters are going to quiet things down? I'm guessing nobody else is using them... have you heard the lifters run in a vehicle that prior to which, had LS7 lifters? If so, was there a difference in sound? I'm very anxious to see your results and hoping for the best, but I can't figure out what makes you so certain these are going to change things. Nevertheless, good luck!

speedtigger

iTrader: (16)

I would say hope is making him say that they are the solution. And, I fully understand where he is coming from. I just wish I was not so skeptical or I would have a set on the way.

I would also say that he is optimistic because the guy he is getting them from come across as VERY credible.

moeZ28

iTrader: (7)

Two thousandths to four thousandths preload doesnt make any sense man...check your numbers. When I called Comp they told me specificly 20-40 thousandths preload... which is .020"-.040"...not .002". My valvetrain was super quiet and never had any valvetrain issues.

salemetro

iTrader: (5)

Thanks Tigger! You are indeed correct. After getting an earful of what I believe to be VERY accurate information from one of the design/ R&D engineers for this company...along with what he told me were his results...after testing more than 400 of the LS7 pieces....I'm left believing that this will be the solution. After all of the double/triple-checking that I've done on my own car, this is what I have it traced down to. About the only thing else it might be, is that ALL of the cam lobes are going flat....not very likely.....especially since it has made noise literally from the point of initial startup (day1).

It's not my intent to start a debate on the quality of the LS7 parts, as my mind is already made up about them. I fully realize that lots of folks love them...I'm just not one of them.

Geoff@EPS should have my new cam package here in roughly 3 weeks. I'll then tear into the car and post back with results/findings.

Here's a video of the car...keep in mind that this was taken with my cell phone, and is considerably louder in person.

http://www.youtube.com/watch?v=yTk5a...eature=channel

tillery

iTrader: (4)

Whats the wall thickness on your headers? Not saying these new lifters wont work. But a lot of valvetrane noise is emmited out thru the exhaust. And in for results. I have very simulator issues with my car.

White.Lightning

iTrader: (53)

What rockers?

salemetro

iTrader: (5)

Stock w/Comp trunion kit.

White.Lightning

iTrader: (53)

Ok cool. I was going to say if you were running an older set of Harland Sharp 'stock rebuilds', that would have been your cause. They sourced an inferior bearing that was failing. My car had multiple bearings that were failing/failed. They rebuilt them for free and I sold them off. I ended up just putting OEM/stock rockers on and solved my issue.

Good luck with your noise. I hope you find it out soon.

salemetro

iTrader: (5)

Thanks for the heads-up. I'm hoping to get to the bottom of this in the next couple weeks.

kenp

iTrader: (9)

Sorry, but it is what it is. The .002"-.004" is straight from the Comp web site. And, when I did my build with AFR 205's one of the AFR recommended lifters was the Comp R lifter with .002"-.004" pre load and that's why they require adjustable components. AFR do not recommend them any more because they are so difficult to get "right".

The spec for preload hasn't changed since I installed mine 5 years ago.
Here is a link to the CURRENT Comp Installation instructions: http://www.compcams.com/Instructions.../COMP4-141.pdf

If you have .020" preload on comp R pro magnum lifters, you are not within the zero lash to 1/8 of a turn after zero lash install spec. That's that.

RonSSNova

iTrader: (3)

Clearly valvetrain noise and sounds BAD!
I'm wondering if you will find something else wrong?
Too bad you are changing the cam as well. 2 changes won't really get you to root cause. But I understand how much extra work would be involved in doing each seperatley.

Good luck and do post up your findings.

Ron

BlackScreaminMachine

iTrader: (17)

Morels are the only Link bar lifters I have ever used. Would trust in them again w/o worries.

salemetro

iTrader: (5)

Yeah...all of this BS has made me just decide to upgrade more stuff....funny how that happens. When the Z06 cam comes out, it should be obvious if there is anything wrong with it....I'm betting that it's just fine, but we'll see. Ideally, I'd just swap the lifters for the sake of a direct comparison...but it's "now or never" on the cam swap, so I voted for NOW lol. Being that the current cam is a stock GM piece, it's not like some sort of fast-ramp rate part. Noise SHOULD be non-existent...but it's not.

We'll see how it all goes...

speedtigger

iTrader: (16)

Did you all have valve train noise before the switch to the Morels?

thunderstruck507

iTrader: (18)

I just hope your valvetrain doesn't get quiet because of the EPS cam and not the high dollar lifters.

Mine made noise with a Comp XE 230/224 and GMPP lifters (AKA caddy race lifters) but when I went to an EPS 230/238 eps intake LSL exhaust lobes and kept my 7.4" pushrods it is quieter than my stock 5.3 truck.

Over the weekend I decided to try some 7.35" pushrods after mis-measuring using my Comp pushrod length tool. It sounded like yours does. I put the 7.4" back in and it got quiet.

I paid attention when tightening them and I have over 1 3/4 turns past zero lash to 22 ft/lbs. Not sure what preload that translates too but it is definitely quiet.

joecar

Subscribing.

salemetro

iTrader: (5)

I'm fairly sure that even the EPS ramp rates will be more aggressive than the stock Z06 cam that's in there right now, so I'm thinking it won't matter. Aren't XE lobes fairly aggressive?


IIRC, each turn translates to .043.....so (if my memory/math is correct), you should be at roughly .074 on your preload?? I can't remember for sure.

thunderstruck507

iTrader: (18)

It is my understanding that the XE lobe is either the softest or next to softest lobe comp has. 230/224 and lift was .57x/.56x

I hope your problem is solved either way though, good luck! It seems every car is different when it comes to these noises and what it likes.

I will add that I could without a doubt tell a difference between running Mobile 1 or Pennzoil Platinum versus the Castrol 0w-30 European formula. Some people say it made theirs louder but the switch to Castrol made my old cam noticeably quieter so I started using it exclusively.