? for setting preload on hydraulic roller lifters.
#378561
07/18/09 02:24 AM
07/18/09 02:24 AM
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Posts: 2,103 East Coast, NJ
fig426
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I have a set of comp roller hydraulic lifters. The spec sheet calls for .030 to .050 preload. I have comp roller rockers that have 3/8 x 24 adjustment screws. 24 threads per inch is .041 inches per thread. 1" divided by 24 = .041. . Once I get the freeplay out of the rockers, can I just make 1 full turn to get approximately .041 inches of preload?
Chris from New Jersey
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Re: ? for setting preload on hydraulic roller lifters.
[Re: fig426]
#378562
07/18/09 05:04 AM
07/18/09 05:04 AM
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451Mopar
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Quote:
I have a set of comp roller hydraulic lifters. The spec sheet calls for .030 to .050 preload. I have comp roller rockers that have 3/8 x 24 adjustment screws. 24 threads per inch is .041 inches per thread. 1" divided by 24 = .041. . Once I get the freeplay out of the rockers, can I just make 1 full turn to get approximately .041 inches of preload?
Yes.
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Re: ? for setting preload on hydraulic roller lifters.
[Re: emarine01]
#378566
07/18/09 06:41 PM
07/18/09 06:41 PM
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fig426
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The lifters have the c-clips. The car does see some street use but primarily track time. Any suggestions or stay with comp's recommendation of .030 to.050?
Chris from New Jersey
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Re: ? for setting preload on hydraulic roller lifters.
[Re: fig426]
#378571
07/19/09 02:03 PM
07/19/09 02:03 PM
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Posts: 43,157 Bend,OR USA
Cab_Burge
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I built a street hemi motor last year with Comp Cams ydraulic roller lifters, I usually set the hydraulics up with 1/4 to 1/2 turn preload cold and reajust after the cam is broken in with warmed up oil. That motor wanted 1 to 1.5 full turns of prelaod to make the lifters quiet Making them quiet down did not affect the idle or the high rpm rev range, I did send one set back after adjusting them like Comps instruction said and still having a lot of lifter-rocker arm noise, that set sounded like a old SB Chevy .030 .030 Duntov solid cam and lifters Play with the adjsutments hot a until you like it
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: ? for setting preload on hydraulic roller lifters.
[Re: Cab_Burge]
#378572
07/19/09 03:38 PM
07/19/09 03:38 PM
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emarine01
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Don't worry about the idle noise it goes away with rpm , and I did say more power not less noise The only down side I found with the hyd roller was with a tall hyd roller lifter with little or no preload and a W style offset intake rocker the push rod angle was way out there
Last edited by emarine01; 07/19/09 03:47 PM.
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Re: ? for setting preload on hydraulic roller lifters.
[Re: emarine01]
#378573
07/23/09 08:34 AM
07/23/09 08:34 AM
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fig426
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Where does the noise come from? The rocker hitting the valve? The pushrod hitting the rocker? The pushrod hitting the plunger? The plunger hitting the C clip? Or the lifter hitting the cam? Either way, wouldn't any of them be bad for the rollers on the lifter or the rollers on the rockers? Or am I just way off here?
Chris from New Jersey
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Re: ? for setting preload on hydraulic roller lifters.
[Re: ScottSmith_Harms]
#378576
07/23/09 02:10 PM
07/23/09 02:10 PM
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Quote:
Speaking of HYD cams, a friend of mine just ran his brand new small block with a Comp Cams Hyd flat tappet cam and wiped 3 lobes. As far as I know he did everything right, adjusted the rockers with the right preload, plenty of break in lube, 20 minute break in period, no problems at first, then started losing power, found a cracked lifter and 3 wiped lobes. What could be the cause of this? I've heard of solid cams having problems lately with the zinc issues but never a hyd. cam?
Scott,
Hydraulic flat tappets have had major issues wiping cams. Was the rpm's varied during break in ? Did the lifters fit good so they could rotate with ease ? Their are a number of things that can cause this. Their were problems with incorrect lifter face finish and crown early on, crown of the lifter face helps with rotation and that could also be one of the causes. I've always used 0 lash and a 1/2 turn to set preload. Also to add more about preload, the less preload you use the more power it frees up due to the amount of HP it takes to turn the motor over with hydraulics. Less preload frees the motor up.
logan426
Last edited by Logan426; 07/23/09 02:19 PM.
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Re: ? for setting preload on hydraulic roller lifters.
[Re: MLR426]
#378578
07/23/09 06:20 PM
07/23/09 06:20 PM
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ScottSmith_Harms
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Quote:
Scott,
Hydraulic flat tappets have had major issues wiping cams.
I've only heard of these problems with solid lifter cams, not hydraulics?
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Re: ? for setting preload on hydraulic roller lifters.
[Re: ScottSmith_Harms]
#378579
07/23/09 06:28 PM
07/23/09 06:28 PM
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emarine01
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Quote:
Quote:
Scott,
Hydraulic flat tappets have had major issues wiping cams.
I've only heard of these problems with solid lifter cams, not hydraulics?
Most hyd cams I spec ed out don't run the spring pressures that solids have , I think its the springs that wire out cams
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Re: ? for setting preload on hydraulic roller lifters.
[Re: emarine01]
#378580
07/23/09 08:44 PM
07/23/09 08:44 PM
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Joined: Jan 2004
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fig426
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So I should say heck with a "measured" preload and just adjust the noise out of them when hot?
Chris from New Jersey
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Re: ? for setting preload on hydraulic roller lifters.
[Re: ScottSmith_Harms]
#378581
07/24/09 07:43 AM
07/24/09 07:43 AM
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Quote:
Quote:
Scott,
Hydraulic flat tappets have had major issues wiping cams.
I've only heard of these problems with solid lifter cams, not hydraulics?
Problems have been with both..Ok I'll add no more.
logan426
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