when claying? valve spring?
Why couldnt you compress a hydraulic lifter plunger to where the valve opens a bit and then back it off till the valve closes? After rotating the crank through the valve events, you'd then check the clay for thickness. If anyone knows EXACTLY why this wouldnt work, please let me know. BTW, opening the valve a couple of hundredths absolutely seats the plunger of a hydraulic lifter against the bottom with a stock spring.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
you are supposed to use a modified roller lifter (cup welded so no preload and a test lightweight spring with adustable p-rod checker set to 0 lash.
This way you get the maximum valve drop mimicing full pump up of lifter at max lift and rpm.
also use organic clay.
This way you get the maximum valve drop mimicing full pump up of lifter at max lift and rpm.
also use organic clay.
Originally Posted by PREDATOR-Z
you are supposed to use a modified roller lifter (cup welded so no preload and a test lightweight spring with adustable p-rod checker set to 0 lash.
This way you get the maximum valve drop mimicing full pump up of lifter at max lift and rpm.
also use organic clay.
This way you get the maximum valve drop mimicing full pump up of lifter at max lift and rpm.
also use organic clay.
How do you know when your lash is set to zero?
Trending Topics
Originally Posted by PREDATOR-Z
you are supposed to use a modified roller lifter (cup welded so no preload and a test lightweight spring with adustable p-rod checker set to 0 lash.
This way you get the maximum valve drop mimicing full pump up of lifter at max lift and rpm.
also use organic clay.
This way you get the maximum valve drop mimicing full pump up of lifter at max lift and rpm.
also use organic clay.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by NassyVette
Where can you get the lightweight checker spring? How about the modified lifter, or can you simply weld up an old lifter? And this only needs to be done to the #1 cylinder right?
Originally Posted by JimMueller
I'd like to just buy both, but I need to know where also.
The checking springs can be bought at any speed shop... Summit, Jegs, Doug Herbert, etc..... I have used the checking springs along with the standard lifter to check PTV clearance. The checking spring is not strong enough to overcome the plunger in the lifter and push it down. Checking springs are meant for the dial indicator method and not the clay method.
Using the clay method will probably require the use of a solid lifter as you need the valve to make an impression in the clay. You want your springs you are going to run and a solid lifter.
I prefer the dial indicator method of checking PTV clearance vs claying, but claying also has it's place when using pistons with valve reliefs. Both ways work fine but I've always liked the dial indicator method. To do it you will need a degree wheel kit.
http://www.popularhotrodding.com/eng...clearance.html
Using the clay method will probably require the use of a solid lifter as you need the valve to make an impression in the clay. You want your springs you are going to run and a solid lifter.
I prefer the dial indicator method of checking PTV clearance vs claying, but claying also has it's place when using pistons with valve reliefs. Both ways work fine but I've always liked the dial indicator method. To do it you will need a degree wheel kit.
http://www.popularhotrodding.com/eng...clearance.html
Last edited by Ryan02SS; May 19, 2007 at 01:15 PM.
Originally Posted by Ryan02SS
The checking springs can be bought at any speed shop... Summit, Jegs, Doug Herbert, etc..... I have used the checking springs along with the standard lifter to check PTV clearance. The checking spring is not strong enough to overcome the plunger in the lifter and push it down. Checking springs are meant for the dial indicator method and not the clay method.
Using the clay method will probably require the use of a solid lifter as you need the valve to make an impression in the clay. You want your springs you are going to run and a solid lifter.
I prefer the dial indicator method of checking PTV clearance vs claying, but claying also has it's place when using pistons with valve reliefs. Both ways work fine but I've always liked the dial indicator method. To do it you will need a degree wheel kit.
http://www.popularhotrodding.com/eng...clearance.html
Using the clay method will probably require the use of a solid lifter as you need the valve to make an impression in the clay. You want your springs you are going to run and a solid lifter.
I prefer the dial indicator method of checking PTV clearance vs claying, but claying also has it's place when using pistons with valve reliefs. Both ways work fine but I've always liked the dial indicator method. To do it you will need a degree wheel kit.
http://www.popularhotrodding.com/eng...clearance.html
ah, thanks for the clarification!
Originally Posted by mr2guru
I think the checker spring would compress before the clay...
To do the clay test right you want a solid valvetrain. The springs your going to run on the engine and a solid lifter. I've heard of people using a pumped up hyd lifter but i've never been able to pump one up enough to where the plunger would not move at all.
On The Tree
Joined: Mar 2003
Posts: 115
Likes: 0
From: Suffolk, VA
Why does the spring even matter if you are using the clay or dial indicator method? When you push down on the valve you are using the lifter, pushrod, and rocker to do the pushing. The only slop you may have is if you compress the hydraulic lifter. The valve spring (checker type or real one) serves only to close the valve. If you use a checker spring and a hydraulic lifter you will be fine using clay. If you use actual valve springs, you should probably use a solid lifter.
Originally Posted by JDM74
Why does the spring even matter if you are using the clay or dial indicator method? When you push down on the valve you are using the lifter, pushrod, and rocker to do the pushing. The only slop you may have is if you compress the hydraulic lifter. The valve spring (checker type or real one) serves only to close the valve. If you use a checker spring and a hydraulic lifter you will be fine using clay. If you use actual valve springs, you should probably use a solid lifter.
I don't think you need a checker spring for claying. Think about the dynamics of the valve train. The purpose of the spring is to close the valve. As long as you use a solid lifter, the spring won't matter. If you are you using a dial indicator then you need a checking spring so that you can can push the valve down to the piston manually, and read the PTV on the indicator. I might be wrong, but as long as there is a SOLID connection from cam, to lifter, to PR, to rocker, to valve, the spring is not going to effect your clay compression...