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? for setting preload on hydraulic roller lifters. #378561 07/18/09 02:24 AM 07/18/09 02:24 AM
Joined: Jan 2004 Posts: 2,103 East Coast, NJ F fig426 OP top fuel
fig426 OP top fuel F Joined: Jan 2004 Posts: 2,103 East Coast, NJ	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

Re: ? for setting preload on hydraulic roller lifters. [Re: fig426] #378562 07/18/09 05:04 AM 07/18/09 05:04 AM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	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.

Re: ? for setting preload on hydraulic roller lifters. [Re: 451Mopar] #378563 07/18/09 05:12 AM 07/18/09 05:12 AM
Joined: Feb 2004 Posts: 4,501 Gainesville,FL G goldmember master
goldmember master G Joined: Feb 2004 Posts: 4,501 Gainesville,FL	If your on the base circle and you want that much preload.

Re: ? for setting preload on hydraulic roller lifters. [Re: goldmember] #378564 07/18/09 07:16 AM 07/18/09 07:16 AM
Joined: Jan 2004 Posts: 2,103 East Coast, NJ F fig426 OP top fuel
fig426 OP top fuel F Joined: Jan 2004 Posts: 2,103 East Coast, NJ	Quote: If your on the base circle and you want that much preload. Is that too much or should I go for a bit less? Chris from New Jersey

Re: ? for setting preload on hydraulic roller lifters. [Re: fig426] #378565 07/18/09 08:08 AM 07/18/09 08:08 AM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	We had crane hyd roller lifters in a old LA rig , I found with less preload we turned more rpm, we ended up going O lash + .002 preload with best results , you need the lifters with the C clip in the top and this was race only not street, We gained around 300 rpm with power min.

Re: ? for setting preload on hydraulic roller lifters. [Re: emarine01] #378566 07/18/09 06:41 PM 07/18/09 06:41 PM
Joined: Jan 2004 Posts: 2,103 East Coast, NJ F fig426 OP top fuel
fig426 OP top fuel F Joined: Jan 2004 Posts: 2,103 East Coast, NJ	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

Re: ? for setting preload on hydraulic roller lifters. [Re: fig426] #378567 07/18/09 06:53 PM 07/18/09 06:53 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	I found with mine power fell off sharp 6500 with .025 preload, as I changed to less preload the rpm and power went up till I was just about on the clips and I gaind 300 turns with power, I ran half the season like that then went solid roller, looking back the hyd cam with little preload ran better than the solid roller that was a little more lift and duration

Re: ? for setting preload on hydraulic roller lifters. [Re: fig426] #378568 07/18/09 09:36 PM 07/18/09 09:36 PM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	When I use to run hydro stuff, I zerowed em and added bet 1/8-1/4 preload.....some stocker racers actually zero em w/out any issues I know of. I never liked that much preload myself. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: ? for setting preload on hydraulic roller lifters. [Re: Thumperdart] #378569 07/19/09 10:29 AM 07/19/09 10:29 AM
Joined: Jan 2003 Posts: 9,875 Weddington, N.C. Streetwize master
Streetwize master Joined: Jan 2003 Posts: 9,875 Weddington, N.C.	I've always set them at 1/2 to 3/4 and never had an issue, I would think with variations in oil pressure, viscosicty, vlave mass and spring pressure it might be tough to get he ideal setting in every case but you can try zero plus 1/2 and then adjust up or down in 1/4 turn increments to see if there is a difference. In the early 90's I know some guys runing 5.0 class cars used to collapse the plungers solid and run them on mild solid rollers and spin them about 7800 to stay within the "factory lifter" rules. WIZE World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker! https://www.youtube.com/watch?v=-mWzLma3YGI In Car: https://www.youtube.com/watch?v=PjXcf95e6v0

Re: ? for setting preload on hydraulic roller lifters. [Re: Streetwize] #378570 07/19/09 01:55 PM 07/19/09 01:55 PM
Joined: Jan 2003 Posts: 9,875 Weddington, N.C. Streetwize master
Streetwize master Joined: Jan 2003 Posts: 9,875 Weddington, N.C.	Ok just so happens I was in the process of setting my Hydraulic roller on the 341....I'm gonna Almost try Mr Emarine's setting of 1/8thand see how it goes...I gotta pull the VC's again anyway to re-torque the heads so I'll see how it goes with less pre-load. WIZE World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker! https://www.youtube.com/watch?v=-mWzLma3YGI In Car: https://www.youtube.com/watch?v=PjXcf95e6v0

Re: ? for setting preload on hydraulic roller lifters. [Re: fig426] #378571 07/19/09 02:03 PM 07/19/09 02:03 PM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	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)

Re: ? for setting preload on hydraulic roller lifters. [Re: Cab_Burge] #378572 07/19/09 03:38 PM 07/19/09 03:38 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	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.

Re: ? for setting preload on hydraulic roller lifters. [Re: emarine01] #378573 07/23/09 08:34 AM 07/23/09 08:34 AM
Joined: Jan 2004 Posts: 2,103 East Coast, NJ F fig426 OP top fuel
fig426 OP top fuel F Joined: Jan 2004 Posts: 2,103 East Coast, NJ	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

Re: ? for setting preload on hydraulic roller lifters. [Re: emarine01] #378574 07/23/09 09:57 AM 07/23/09 09:57 AM
Joined: Mar 2006 Posts: 9,835 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,835 MI, usa	I set my Comps to 1/2 turn on my 372 small block 5 years ago. Pulls clean to 6800. Never have had to touch them. Doug

Re: ? for setting preload on hydraulic roller lifters. [Re: dvw] #378575 07/23/09 10:02 AM 07/23/09 10:02 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	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?

Re: ? for setting preload on hydraulic roller lifters. [Re: ScottSmith_Harms] #378576 07/23/09 02:10 PM 07/23/09 02:10 PM
Joined: Aug 2005 Posts: 4,799 ILL M MLR426 master
MLR426 master M Joined: Aug 2005 Posts: 4,799 ILL	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.

Re: ? for setting preload on hydraulic roller lifters. [Re: MLR426] #378577 07/23/09 03:08 PM 07/23/09 03:08 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	On my old hyd roller with .001 to .002 preload , I thought it stopped lifter pump up with a HV oil pump @ high rpm by stopping the plunger before valve float, but anyhow it freed 300 turns however it did it

Re: ? for setting preload on hydraulic roller lifters. [Re: MLR426] #378578 07/23/09 06:20 PM 07/23/09 06:20 PM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	Quote: Scott, Hydraulic flat tappets have had major issues wiping cams. I've only heard of these problems with solid lifter cams, not hydraulics?

Re: ? for setting preload on hydraulic roller lifters. [Re: ScottSmith_Harms] #378579 07/23/09 06:28 PM 07/23/09 06:28 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	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

Re: ? for setting preload on hydraulic roller lifters. [Re: emarine01] #378580 07/23/09 08:44 PM 07/23/09 08:44 PM
Joined: Jan 2004 Posts: 2,103 East Coast, NJ F fig426 OP top fuel
fig426 OP top fuel F Joined: Jan 2004 Posts: 2,103 East Coast, NJ	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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