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Old 01-16-2010, 12:52 AM   #1
9sectruck
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Default oil pressure to high for hyd. lifter??

I originally set the rockers 1/2 turn past zero lash, the engine would not fire, so I done a compression test 100psi, then i backed off all the rockers and done another compression test and got 120 130s, on the seconed go around i only went 1/4 turn past zero lash, the engine fired and ran for two 1min cycles but it never sounded right, so directly after the second run i pulled some plugs and did another compression test and again "I only got 104psi, I run 20/50 vr1 oil at 85psi, is the oil pressure to high and causing the lifter to pump up and act like a solid????
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Old 01-16-2010, 02:01 AM   #2
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Default Re: oil pressure to high for hyd. lifter??

Try backing off your lifters some and grammer school.
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Old 01-16-2010, 02:47 AM   #3
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Default Re: oil pressure to high for hyd. lifter??

no, we run 100 psi oil pressure and do some dumb shit with hyd lifters. Just put a tiny amount of preload (.010 though, a 1/16 of a turn or just enough to take lash out) on the to get it started, let the lifters pump up, then redo them. Maybe youve got them collapsed and they are pump up as it runs and you have much more preload than you think.
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Old 01-16-2010, 09:54 AM   #4
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Default Re: oil pressure to high for hyd. lifter??

my cam is only a 610 lift at the rocker, if you dont preload them enough wont the lifter just collapse instead of pushing the valve open?
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Old 01-16-2010, 11:35 AM   #5
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Default Re: oil pressure to high for hyd. lifter??

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Originally Posted by GrannySShifting View Post
no, we run 100 psi oil pressure and do some dumb shit with hyd lifters. Just put a tiny amount of preload (.010 though, a 1/16 of a turn or just enough to take lash out) on the to get it started, let the lifters pump up, then redo them. Maybe youve got them collapsed and they are pump up as it runs and you have much more preload than you think.
100% agree.

I bet the lifters are bottomed out.

Back them all the way off, then hold the push rod and jiggle it as you tighten the lash up. When you can feel the slack go away, stop. Once the slack is gone, you can still probably collapse the lifter another 1/4".
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Old 01-16-2010, 09:01 PM   #6
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Default Re: oil pressure to high for hyd. lifter??

ok i figured out my lash problem, i found out its not the lifter at all its the overlap on the cam, with the rockers completly loose the valve terain will not see the cam profile. we set the rockers from zero lash, and all the way down to 1/2 turn past zero lash and the compression test came out the same
AGREE????????????????
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Old 01-18-2010, 02:19 PM   #7
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Default Re: oil pressure to high for hyd. lifter??

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Originally Posted by 9sectruck View Post
my cam is only a 610 lift at the rocker, if you dont preload them enough wont the lifter just collapse instead of pushing the valve open?
If the lifters are filling with oil, they will not compress..

BTW.. I set my lifter pre-load at only 1/8 turn, after all the pushrod slack is removed.. My hydraulicly cammed motor turns around 7500 thru the lights..
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Old 01-18-2010, 10:23 PM   #8
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Default Re: oil pressure to high for hyd. lifter??

how much spring pressure Jeff?
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Old 01-18-2010, 10:30 PM   #9
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Default Re: oil pressure to high for hyd. lifter??

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how much spring pressure Jeff?
I'll have to check to be sure.. But it's around 215 or 218 lbs on the seat..
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Old 01-19-2010, 08:19 AM   #10
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Default Re: oil pressure to high for hyd. lifter??

Not wanting to hyjack the thread but spring pressures are important on hydraulic rollers too and I like doing comparo's to see what others are doing to have success. I think I will end up adding more to mine as I am only at 165 on the seat.
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Old 01-19-2010, 10:59 AM   #11
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Default Re: oil pressure to high for hyd. lifter??

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Originally Posted by Bandit1320 View Post
Not wanting to hyjack the thread but spring pressures are important on hydraulic rollers too and I like doing comparo's to see what others are doing to have success. I think I will end up adding more to mine as I am only at 165 on the seat.
I had a NMRA Renegade racer tell me you can't run too much spring pressure..

I know that's not totally true, but I got the jest of what he was saying..

The Renegade rules state that they must run stock factory roller lifters, and they can't be bottomed out or shimmed up.. Totally un-modified.. Many Renegade cars are turning in excess of 8000 rpms..

Many are also running "zero" lash.. Just taking out all the pushrod clearence.. And NO preload what so ever..
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Old 01-20-2010, 09:54 AM   #12
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Default Re: oil pressure to high for hyd. lifter??

Thanks Jeff, this will help clarify questions others may have as well.
I want a solid in my ride but it will have to wait untill next season for now I will use these tricks.
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Old 01-20-2010, 05:34 PM   #13
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Default Re: oil pressure to high for hyd. lifter??

170 here on the seat but a very mild cam 6500redline
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Old 01-21-2010, 09:15 PM   #14
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Default Re: oil pressure to high for hyd. lifter??

I can speak from experience on the lifter thing. You can't have too much oil pressure, anything you do to keep it pumped up is a plus. Depending on your approach on lifters....some guys say you can't have too much spring pressure because they run the lifter almost bottomed out and then run an aggressive cam. Easy to go 8500 rpm that way. Others will run less spring pressure...around 150lbs seat and 375 open...but that at .550 lift. There are more tricks to making a hyd roller rev, but here are some of the basics theories people use.
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Old 01-22-2010, 02:00 AM   #15
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Default Re: oil pressure to high for hyd. lifter??

.600-.700 lift, done everything from @130 on seat to 220 on seat and turned stuff 7500-8300 rpm Its a combination of alot of things, lifter valving, valvetrain mass and location, spring setup, and of course lobe choice.

if someone is telling you you cant run too much pressure, also consider if they are limited lift classes and they are purposefully lofting the valves. In that case Im sure you want it to loft and settle down ASAP. The one thing I dont like about tons of spring pressure though esp on stock cast lifter bodies not something as rigid as Morels or something, would be what I imagine happening with lifter body distortion. If it dont stay round, wont seal well just like a ring seal&cylinder.

Sometimes, MORE lift will make a lobe more stable at rpm when other dynamics start to show up vs 1500 rpm action
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