Lifter preload?
Thread Starter
Instructor
Joined: Sep 2009
Posts: 201
Likes: 0
From: Rancho cordva Ca
Lifter preload?
Hi All,
Can someone clear this up for me. I've spent a lot of time
searching the forum and internet and can't seem to find a good answer.
I've installed a set of 1.8 RR's with 7.400 Chromemoly PR.
Stock lifters and cam.
What is the best preload that the LS6 lifter should be set at?
Seems like everyone has there own idea from .010"-.100"
Mine are right about .100" now. My RR's seem a little noisy.
Thanks for your help
Can someone clear this up for me. I've spent a lot of time
searching the forum and internet and can't seem to find a good answer.
I've installed a set of 1.8 RR's with 7.400 Chromemoly PR.
Stock lifters and cam.
What is the best preload that the LS6 lifter should be set at?
Seems like everyone has there own idea from .010"-.100"
Mine are right about .100" now. My RR's seem a little noisy.
Thanks for your help
Tech Contributor
Joined: Jan 2007
Posts: 19,450
Likes: 1,155
From: Dyer, IN
Hi All,
Can someone clear this up for me. I've spent a lot of time
searching the forum and internet and can't seem to find a good answer.
I've installed a set of 1.8 RR's with 7.400 Chromemoly PR.
Stock lifters and cam.
What is the best preload that the LS6 lifter should be set at?
Seems like everyone has there own idea from .010"-.100"
Mine are right about .100" now. My RR's seem a little noisy.
Thanks for your help
Can someone clear this up for me. I've spent a lot of time
searching the forum and internet and can't seem to find a good answer.
I've installed a set of 1.8 RR's with 7.400 Chromemoly PR.
Stock lifters and cam.
What is the best preload that the LS6 lifter should be set at?
Seems like everyone has there own idea from .010"-.100"
Mine are right about .100" now. My RR's seem a little noisy.
Thanks for your help
http://forums.corvetteforum.com/c5-t...ic-lifter.html
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
Hi All,
Can someone clear this up for me. I've spent a lot of time
searching the forum and internet and can't seem to find a good answer.
I've installed a set of 1.8 RR's with 7.400 Chromemoly PR.
Stock lifters and cam.
What is the best preload that the LS6 lifter should be set at?
Seems like everyone has there own idea from .010"-.100"
Mine are right about .100" now. My RR's seem a little noisy.
Thanks for your help
Can someone clear this up for me. I've spent a lot of time
searching the forum and internet and can't seem to find a good answer.
I've installed a set of 1.8 RR's with 7.400 Chromemoly PR.
Stock lifters and cam.
What is the best preload that the LS6 lifter should be set at?
Seems like everyone has there own idea from .010"-.100"
Mine are right about .100" now. My RR's seem a little noisy.
Thanks for your help
1.8 ratio rockers also increase the valve closing velocity and will cause more valve closer noise in general. Other than being annoying it really doesn’t hurt anything.
Thread Starter
Instructor
Joined: Sep 2009
Posts: 201
Likes: 0
From: Rancho cordva Ca
I would suggest a minimum of .060" and a maximum of .100" preload. I doubt that the preload has anything to do with your noise however. What valve springs are you using? Are you sure with the 1.8 ratio rockers you are not going into coil bind? Not only will that make noise, there is a good chance of breaking a valve stem. Not a good thing at all.
1.8 ratio rockers also increase the valve closing velocity and will cause more valve closer noise in general. Other than being annoying it really doesn’t hurt anything.
1.8 ratio rockers also increase the valve closing velocity and will cause more valve closer noise in general. Other than being annoying it really doesn’t hurt anything.
I went with duals just for added protect in case of a spring failure I wouldn't drop a valve. So if I am right at .100 or a hair over should I just leave it?
Thanks!
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
Thanks for the replies! As for springs I have a set of Crane Cam dual springs. I don't have the exact open and closed pressure in front of me but I know they were near stock or barely higher than stock and can handle a .650 lift.
I went with duals just for added protect in case of a spring failure I wouldn't drop a valve. So if I am right at .100 or a hair over should I just leave it?
Thanks!
I went with duals just for added protect in case of a spring failure I wouldn't drop a valve. So if I am right at .100 or a hair over should I just leave it?
Thanks!
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Thanks for the replies! As for springs I have a set of Crane Cam dual springs. I don't have the exact open and closed pressure in front of me but I know they were near stock or barely higher than stock and can handle a .650 lift.
I went with duals just for added protect in case of a spring failure I wouldn't drop a valve. So if I am right at .100 or a hair over should I just leave it?
Thanks!
I went with duals just for added protect in case of a spring failure I wouldn't drop a valve. So if I am right at .100 or a hair over should I just leave it?
Thanks!
Thread Starter
Instructor
Joined: Sep 2009
Posts: 201
Likes: 0
From: Rancho cordva Ca
Not sure which Crane springs you have (832 or the later 833), but keep an eye on them when you dyno. The Crane 832's have a very strong harmonic at 6,200 RPM and it will dip your curve because they can't control the valves. Hate to tell you this if these are your springs but I found out the hard way and not many people are aware of this.
I'll check which ones I have, I hope they are the good ones.
If they are the bad ones can they cause damage?
Last edited by Z06 4 Me; Apr 17, 2010 at 03:53 PM.
Thread Starter
Instructor
Joined: Sep 2009
Posts: 201
Likes: 0
From: Rancho cordva Ca
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Thread Starter
Instructor
Joined: Sep 2009
Posts: 201
Likes: 0
From: Rancho cordva Ca
Not sure which Crane springs you have (832 or the later 833), but keep an eye on them when you dyno. The Crane 832's have a very strong harmonic at 6,200 RPM and it will dip your curve because they can't control the valves. Hate to tell you this if these are your springs but I found out the hard way and not many people are aware of this.
How can I tell if the springs are 832 or 833's?
Thanks!
