Morel lifters and preload?
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From: Sierra Vista, AZ
Morel lifters and preload? I cant find the recommended preload for Morel lifters? I am asking in here cause I've seen CStraub and other experienced with Morels in here. Thanks.
Charlie
Charlie
Originally Posted by CAT3
I cant find the recommended preload for Morel lifters? I am asking in here cause I've seen CStraub and other experienced with Morels in here. Thanks.
Charlie
Charlie
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From: Sierra Vista, AZ
CStraub, thanks...I was wondering if you hadn't slipped off the site...*wipes sweat from brow* I appreciate it. While your here, if you look back here, how is this for checking length...
Remove rocker arm and pushrod
Rotate the engine until both valves are closed? Or is until one valve is mid-lift and check opposite valve?
Insert Checker
Torque Stock Rocker to 22ftlbs
Adjust Checker until there is zero lash, and then add in Morels recommended pre-load + .010" for growth while hot of Aluminum block/heads.
So, in this way, insert checker, zero lash, measure it, we'll say 8.000" add in the .040" (morels pre-load) + .010" (growth) = 8.050"? And of course use overall or oil hole drilled measurement.
Also, is it better to run the high (.040") or low side (.030") of pre-load, what effect might there be?
Charlie
Remove rocker arm and pushrod
Rotate the engine until both valves are closed? Or is until one valve is mid-lift and check opposite valve?
Insert Checker
Torque Stock Rocker to 22ftlbs
Adjust Checker until there is zero lash, and then add in Morels recommended pre-load + .010" for growth while hot of Aluminum block/heads.
So, in this way, insert checker, zero lash, measure it, we'll say 8.000" add in the .040" (morels pre-load) + .010" (growth) = 8.050"? And of course use overall or oil hole drilled measurement.
Also, is it better to run the high (.040") or low side (.030") of pre-load, what effect might there be?
Charlie
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Originally Posted by CAT3
CStraub, thanks...I was wondering if you hadn't slipped off the site...*wipes sweat from brow* I appreciate it. While your here, if you look back here, how is this for checking length...
Remove rocker arm and pushrod
Rotate the engine until both valves are closed? Or is until one valve is mid-lift and check opposite valve?
Insert Checker
Torque Stock Rocker to 22ftlbs
Adjust Checker until there is zero lash, and then add in Morels recommended pre-load + .010" for growth while hot of Aluminum block/heads.
So, in this way, insert checker, zero lash, measure it, we'll say 8.000" add in the .040" (morels pre-load) + .010" (growth) = 8.050"? And of course use overall or oil hole drilled measurement.
Also, is it better to run the high (.040") or low side (.030") of pre-load, what effect might there be?
Charlie
Remove rocker arm and pushrod
Rotate the engine until both valves are closed? Or is until one valve is mid-lift and check opposite valve?
Insert Checker
Torque Stock Rocker to 22ftlbs
Adjust Checker until there is zero lash, and then add in Morels recommended pre-load + .010" for growth while hot of Aluminum block/heads.
So, in this way, insert checker, zero lash, measure it, we'll say 8.000" add in the .040" (morels pre-load) + .010" (growth) = 8.050"? And of course use overall or oil hole drilled measurement.
Also, is it better to run the high (.040") or low side (.030") of pre-load, what effect might there be?
Charlie
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Originally Posted by Cstraub
More preload less power.
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From: Sierra Vista, AZ
Originally Posted by GuitsBoy
Why would more preload make for less power? Because its got an extra 5# of spring to compress? How about considering the fact that more preload means less oil in the lifter which means less weight which makes for a lighter valvetrain.
CStraub, thanks again. Will get this done hopefully before I ship the car back to the mainland. I will also check the swipe across the valve tip.
Charlie
Originally Posted by GuitsBoy
Why would more preload make for less power? Because its got an extra 5# of spring to compress? How about considering the fact that more preload means less oil in the lifter which means less weight which makes for a lighter valvetrain.
I am no engineer but it has something to do with the high pressure area/ chamber in the bottom of the lifter. Hyd. lifters came up in conversation on my back deck during the NHRA race with Ed Morel. He would not go into detail but they happen on something with the valving of hyd lifters and amount of preload and the power loss it causes. The next generation hyd will be out around August and the pre-load will be minimal but the rpm potential will be much greater and for continuous durations of 15 to 20 minutes at the upper rpm.
Originally Posted by Cstraub
Guitsboy,
I am no engineer but it has something to do with the high pressure area/ chamber in the bottom of the lifter. Hyd. lifters came up in conversation on my back deck during the NHRA race with Ed Morel. He would not go into detail but they happen on something with the valving of hyd lifters and amount of preload and the power loss it causes. The next generation hyd will be out around August and the pre-load will be minimal but the rpm potential will be much greater and for continuous durations of 15 to 20 minutes at the upper rpm.
I am no engineer but it has something to do with the high pressure area/ chamber in the bottom of the lifter. Hyd. lifters came up in conversation on my back deck during the NHRA race with Ed Morel. He would not go into detail but they happen on something with the valving of hyd lifters and amount of preload and the power loss it causes. The next generation hyd will be out around August and the pre-load will be minimal but the rpm potential will be much greater and for continuous durations of 15 to 20 minutes at the upper rpm.
Im gonna take a shot and say around 2500 psi. Figure a dual spring at 350# of open pressure against a plunger that looks to be about 1/6 of an square inch at max lift. That would account for 2100 psi right there. Then add on another couple hundred psi just for accelerating the inertia of the pushrod, the rocker, the valve, the retainer and atleast some of the spring. Just a shot in the dark.
Damn, thats a lot. 
Less preload also makes more power due to the longer duration and more lift, but the biggie is when the lifters go into "pump up", which is what happens when something in the system causes a gap in the system that the lifter has to take up, so it stays pumped up and holds the valve open, and then power goes down.
Bret
Bret
Okay...I am also double checking my pushrod length soon.
Iron block, aluminum heads.
Lunati/morel lifters.
Just to clarify...zero lash is when there is no play in the pushrod correct??
Take that number and add 040" for pre-load and pump-up.
Sound right?
Iron block, aluminum heads.
Lunati/morel lifters.
Just to clarify...zero lash is when there is no play in the pushrod correct??
Take that number and add 040" for pre-load and pump-up.
Sound right?
