Ajustable rockers?
Thread Starter
On The Tree
Joined: May 2012
Posts: 133
Likes: 1
Ajustable rockers? Ok - so I purchased a set of fully adjustable roller rockers, for my Lq4 project.
They are made by Pro Comp
Nice looking stainless pieces.
However - no instructions.
What is the proper preload on an adjustable LS derivitive rocker
1/4, 1/2, 3/4 or full turn past static cold set?
or am I waiting for a running engine and loosening till they clack and tighten them whatever amount of turn for proper preload?
Any help would be appreciated as there is zero info to be found so far in my searches online anywhere on LS adjustable rocker usage.
thanks
They are made by Pro Comp
Nice looking stainless pieces.
However - no instructions.
What is the proper preload on an adjustable LS derivitive rocker
1/4, 1/2, 3/4 or full turn past static cold set?
or am I waiting for a running engine and loosening till they clack and tighten them whatever amount of turn for proper preload?
Any help would be appreciated as there is zero info to be found so far in my searches online anywhere on LS adjustable rocker usage.
thanks
It depends on the lifter. If your specific lifter needs .050" preload, you turn the adjuster on the rocker to get the .050" preload. Using the turn method won't work unless you know how much preload is achieve with each turn of the adjuster.
Contact the manufacturer, or check it yourself, but you need the thread pitch of the adjustment bolt. From that you can determine the turns required for proper preload of whatever lifter you are running. Not sure how tight your setup is, but you also have to take care in adjusting slowly so you don't drive the valve into the piston. This will allow time to bleed off the lifter while you adjust the preload.
Thread Starter
On The Tree
Joined: May 2012
Posts: 133
Likes: 1
The stuff you mention is in regards to non adjustables
with the exception of BBC motors that want 1 full turn, , adjusting hydraulic lifters, historically, has been tighten to stop clacking and then an additional 1/4 or 1/2 turn - no matter whose lifter was under the pushrod
Are you telling me that the LS motor is so different that the old fashioned adjustment proceedure wont work
All i was looking for was a known manual adjustment - whether it is 1/4 1/2 3/4 turn or?
Or is it maybe that few or none have switched to adjustable rockers on the LS so there is no data base for a standard tightening adjustment from experience??
thanks for the input
with the exception of BBC motors that want 1 full turn, , adjusting hydraulic lifters, historically, has been tighten to stop clacking and then an additional 1/4 or 1/2 turn - no matter whose lifter was under the pushrod
Are you telling me that the LS motor is so different that the old fashioned adjustment proceedure wont work
All i was looking for was a known manual adjustment - whether it is 1/4 1/2 3/4 turn or?
Or is it maybe that few or none have switched to adjustable rockers on the LS so there is no data base for a standard tightening adjustment from experience??
thanks for the input
Last edited by Seeker1056; Dec 12, 2017 at 07:49 PM.
TECH Resident
Joined: Apr 2014
Posts: 985
Likes: 12
The stuff you mention is in regards to non adjustables
with the exception of BBC motors that want 1 full turn, , adjusting hydraulic lifters, historically, has been tighten to stop clacking and then an additional 1/4 or 1/2 turn - no matter whose lifter was under the pushrod
Are you telling me that the LS motor is so different that the old fashioned adjustment proceedure wont work
All i was looking for was a known manual adjustment - whether it is 1/4 1/2 3/4 turn or?
Or is it maybe that few or none have switched to adjustable rockers on the LS so there is no data base for a standard tightening adjustment from experience??
thanks for the input
with the exception of BBC motors that want 1 full turn, , adjusting hydraulic lifters, historically, has been tighten to stop clacking and then an additional 1/4 or 1/2 turn - no matter whose lifter was under the pushrod
Are you telling me that the LS motor is so different that the old fashioned adjustment proceedure wont work
All i was looking for was a known manual adjustment - whether it is 1/4 1/2 3/4 turn or?
Or is it maybe that few or none have switched to adjustable rockers on the LS so there is no data base for a standard tightening adjustment from experience??
thanks for the input
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The stuff you mention is in regards to non adjustables
with the exception of BBC motors that want 1 full turn, , adjusting hydraulic lifters, historically, has been tighten to stop clacking and then an additional 1/4 or 1/2 turn - no matter whose lifter was under the pushrod
Are you telling me that the LS motor is so different that the old fashioned adjustment proceedure wont work
All i was looking for was a known manual adjustment - whether it is 1/4 1/2 3/4 turn or?
Or is it maybe that few or none have switched to adjustable rockers on the LS so there is no data base for a standard tightening adjustment from experience??
thanks for the input
with the exception of BBC motors that want 1 full turn, , adjusting hydraulic lifters, historically, has been tighten to stop clacking and then an additional 1/4 or 1/2 turn - no matter whose lifter was under the pushrod
Are you telling me that the LS motor is so different that the old fashioned adjustment proceedure wont work
All i was looking for was a known manual adjustment - whether it is 1/4 1/2 3/4 turn or?
Or is it maybe that few or none have switched to adjustable rockers on the LS so there is no data base for a standard tightening adjustment from experience??
thanks for the input
FWIW, scroll down just a little. http://www.compcams.com/Technical/In.../Files/250.pdf
http://www.compcams.com/Instructions/Files/151.pdf
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