Comp 'R' Lifter Failure
Registered User
Joined: Jul 2001
Posts: 151
Re: Comp 'R' Lifter Failure
Originally Posted by Mindgame
Are we picking and choosing what advice we want to follow from our manufacturers vette40th? 
Been a common practice for years now to lighted up the preload if you want to turn better ET's. I've seen a number of hydraulic cars pick up 2 tenths going from ~1/4 to 1/8 turn or less. Most of the times they respond well... then there are those that don't and that's a whole other can of variables.
I have always had best success running the comp R at 1/16-1/8 turn. You can use a feeler and a dial indicator if you want to set it up like Comp recommends. There's a thread where this was discussed once before. Just search for it.
-Mindgame
Been a common practice for years now to lighted up the preload if you want to turn better ET's. I've seen a number of hydraulic cars pick up 2 tenths going from ~1/4 to 1/8 turn or less. Most of the times they respond well... then there are those that don't and that's a whole other can of variables.
I have always had best success running the comp R at 1/16-1/8 turn. You can use a feeler and a dial indicator if you want to set it up like Comp recommends. There's a thread where this was discussed once before. Just search for it.
-Mindgame
Registered User
Joined: Nov 2001
Posts: 2,985
From: In a house by the bay
Re: Comp 'R' Lifter Failure
Originally Posted by vette40th
Mindgame Mindgame Mindgame, how in the hell do you set preload of a hydraulic lifter with a feeler gauge. It is supposed to sit on the lifter then be tightened, it is not a solid roller. And the dial indicator will tell you how far the pushrod goes down while tightening
How to find zero lash with a feeler and a hydraulic lifter....
Most people like the twist-a-pushrod approach to finding zero lash but you can also find it with a feeler gage. Simply find yourself a .001 feeler and tighten up til you get the slightest drag on the feeler gage. Guess what... you're at zero lash. Beats wriggling a pushrod around and dealing with bleeding lifters. But hey... it's just another way to do things.
-Mindgame
Registered User
Joined: Oct 1999
Posts: 1,171
From: Henry, VA USA
Re: Comp 'R' Lifter Failure
I didn't read the entire 5 page thread, but thought I would add my experience.
I had the Comp R lifters installed w/ my 306. I used the double springs they recommended w/ the Pro Mag lifters. I haven't had any issues as of yet. They were installed about 20k miles ago. This is on a 95Z w/ 93k miles.
Good luck, and hope you get it figured out. The pics looked really clean.
I had the Comp R lifters installed w/ my 306. I used the double springs they recommended w/ the Pro Mag lifters. I haven't had any issues as of yet. They were installed about 20k miles ago. This is on a 95Z w/ 93k miles.
Good luck, and hope you get it figured out. The pics looked really clean.
Registered User
Joined: Jan 2005
Posts: 924
From: Hopkinsville KY
Re: Comp 'R' Lifter Failure
Originally Posted by Mindgame
How to find zero lash with a feeler and a hydraulic lifter....
Most people like the twist-a-pushrod approach to finding zero lash but you can also find it with a feeler gage. Simply find yourself a .001 feeler and tighten up til you get the slightest drag on the feeler gage. Guess what... you're at zero lash. Beats wriggling a pushrod around and dealing with bleeding lifters. But hey... it's just another way to do things.
-Mindgame
Most people like the twist-a-pushrod approach to finding zero lash but you can also find it with a feeler gage. Simply find yourself a .001 feeler and tighten up til you get the slightest drag on the feeler gage. Guess what... you're at zero lash. Beats wriggling a pushrod around and dealing with bleeding lifters. But hey... it's just another way to do things.
-Mindgame
Advanced Member
Joined: Nov 2003
Posts: 3,874
From: Under The Hood
Re: Comp 'R' Lifter Failure
This is confussing... I'm going to do this thread like I do all the other threads on here... buy the parts and just figure it out for myself.
One guy says this... that guy says that.... yatta yatta... next thing you know we're worse off than we were before.
One guy says this... that guy says that.... yatta yatta... next thing you know we're worse off than we were before.
Thread Starter
Registered User
Joined: Nov 2002
Posts: 587
From: Hungary, Budapest
Re: Comp 'R' Lifter Failure
Dammit.
I need one replacement Comp R lifter, part number is 875-1. Summitracing has them on backorder till 2005/05/12, and I can't get ahold of Dave@CMS neither
I HAVE to get this car up and running till May 10th (event)!!! Should I ditch all Comp 'R's and replace them with the original 46k GM lifters, or should I replace just the broken one with the original? What do you think of running 15 Comp 'R' and 1 stock lifter? (stupid question maybe)
Cam is a XE 233/239, revving to 6500.
Please tell me what to do guys!
I need one replacement Comp R lifter, part number is 875-1. Summitracing has them on backorder till 2005/05/12, and I can't get ahold of Dave@CMS neither
I HAVE to get this car up and running till May 10th (event)!!! Should I ditch all Comp 'R's and replace them with the original 46k GM lifters, or should I replace just the broken one with the original? What do you think of running 15 Comp 'R' and 1 stock lifter? (stupid question maybe)
Cam is a XE 233/239, revving to 6500.
Please tell me what to do guys!
Registered User
Joined: Jul 2004
Posts: 371
From: Earth, Socal
Re: Comp 'R' Lifter Failure
I wouldnt run 15 "R" lifters and one stock lifter.. they are completely different with how they work..
6500 might be a but much for the stockers on that cam, but you may be able to get away with it until you can get the replacement...
I would search the boards for a used set and pick that up myself.. Not good to mix and match "similar" valvetrain components...
6500 might be a but much for the stockers on that cam, but you may be able to get away with it until you can get the replacement...
I would search the boards for a used set and pick that up myself.. Not good to mix and match "similar" valvetrain components...
Registered User
Joined: Mar 2005
Posts: 166
From: So Cal
Re: Comp 'R' Lifter Failure
The following is what I got back from Comp after inquiring about the lifters and if there had been a re-design
"We have not changed our 875's. The only time we have seen a problem with these lifters is when the valve train goes into severe valve float or the adjustment has changed from our recommended settings.
Thank you and hope this helps"
"We have not changed our 875's. The only time we have seen a problem with these lifters is when the valve train goes into severe valve float or the adjustment has changed from our recommended settings.
Thank you and hope this helps"
Registered User
Joined: Jul 2001
Posts: 151
Re: Comp 'R' Lifter Failure
Originally Posted by tardy007
The following is what I got back from Comp after inquiring about the lifters and if there had been a re-design
"We have not changed our 875's. The only time we have seen a problem with these lifters is when the valve train goes into severe valve float or the adjustment has changed from our recommended settings.
Thank you and hope this helps"
"We have not changed our 875's. The only time we have seen a problem with these lifters is when the valve train goes into severe valve float or the adjustment has changed from our recommended settings.
Thank you and hope this helps"
problem with these lifters is when the valve train goes into severe valve
float or the adjustment has changed from our recommended settings.
Thank you and hope this helps"
Must be allot of inquiries at Comp Cams.
Registered User
Joined: Mar 2002
Posts: 4,827
From: Waynesboro, PA
Re: Comp 'R' Lifter Failure
Originally Posted by tardy007
The following is what I got back from Comp after inquiring about the lifters and if there had been a re-design
"We have not changed our 875's. The only time we have seen a problem with these lifters is when the valve train goes into severe valve float or the adjustment has changed from our recommended settings.
Thank you and hope this helps"
"We have not changed our 875's. The only time we have seen a problem with these lifters is when the valve train goes into severe valve float or the adjustment has changed from our recommended settings.
Thank you and hope this helps"