Hyd Roller Valve Adjustment - Chevelle Tech
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  #1  
Old Nov 15th, 10, 12:27 AM
Buffalobillpatrick Buffalobillpatrick is offline
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Bill
 
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Default Hyd Roller Valve Adjustment

First posted on Crane's website on January 3, 2005:
Hydraulic Roller Lifter Adjustment Recommendation

With the increased popularity of hydraulic roller cams, our phone techs are getting more questions on proper adjustment of hydraulic roller valve trains. First, a hydraulic roller tappet weighs more than a hydraulic flat tappet due to the extra mass of the wheel, axle and support struts. This extra mass, as well as the quicker opening rates available to the roller cam design, requires the use of higher valve spring on-the-seat pressures and higher valve spring open pressures to control the increased inertia of the lifter.

Higher seat and open pressures can cause pushrods to bend; therefore, use the stiffest pushrods available to assure proper valve action. (This is a “speed secret” that we’ve seen proven in countless dyno tests. We prefer heavy-wall pushrods for just this reason!)

Finally, hydraulic roller tappets will perform best with at least one turn of preload on the lifter. This is different from flat-faced lifters which perform best at zero 0 to ½ turn of preload. Tests at Crane R&D have consistently shown best performance (for hydraulic roller cam valve trains) occurs with the preload set at 1 ¼ - 1 ½ turns down from zero lash. This adjustment will maximize power throughout the RPM range and increase the useable top end by 200 - 300 RPM. This preload setting has been confirmed on every engine family we have tested! Check the tutorial in the front of the new Crane Cams Valve Spring Catalog for spring pressure recommendations for various applications.

I found this today & set mine again to 1.5 turns. My rockers seem to make less noise & I verified oiling.

I have Lunati hyd roller cam, lifters, & beehive valve springs 170/360#

BBP
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  #2  
Old Nov 15th, 10, 6:39 AM
MadmanMark MadmanMark is offline
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Default Re: Hyd Roller Valve Adjustment

I'd call Lunati and ask them what they recommend for the lifters you have. I thought the amount of ideal preload might vary by lifter design. I was recommended to go 2/3 on the morels. Quiet isn't always best.
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  #3  
Old Nov 15th, 10, 6:40 AM
dreis454 dreis454 is offline
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Default Re: Hyd Roller Valve Adjustment

Hmmmmm mine are set @ 1/4 turn,Quiet as can be & revs past 5800 (highest I've tried.)
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  #4  
Old Nov 15th, 10, 7:44 AM
69-CHVL 69-CHVL is offline
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Default Re: Hyd Roller Valve Adjustment

Interesting Bill. I knew Crane wanted alot of preload, but not this much. They want as much oil out of the lifter as possible. 1 to 1.5 turns will get the plunger more or less in the center of its travel.

Be advised Crane also recommends alot of spring pressure...the roller cams use a 528lb-rate spring! Ends up with 150 seat, around 480 open for a a typical .620 lift cam.
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  #5  
Old Nov 15th, 10, 11:55 AM
Heckeng Heckeng is offline
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Default Re: Hyd Roller Valve Adjustment

I have heard that the Morels are the same way Bill, good find.
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  #6  
Old Nov 15th, 10, 12:31 PM
cstraub cstraub is offline
 
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Default Re: Hyd Roller Valve Adjustment

Morels,
SBC and LS1 engines should be around .030 to .040" of preload. .030 for iron and .040" for aluminum. On BBC they should be around .040 to .050". Iron aluminum still apply.

Morels do have a seating in time with the check ball and it can take around 100 miles or so. During this time they can be noisey. If this does not get better you can adjust valves to another .010" of preload and this usually takes care of it.
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  #7  
Old Nov 15th, 10, 12:35 PM
crazydavey crazydavey is offline
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Default Re: Hyd Roller Valve Adjustment

Quote:
Originally Posted by Heckeng View Post
I have heard that the Morels are the same way Bill, good find.
I just put a set of Morels in the Monte with a 1/4 turn...very quiet with steel roller rockers....same lifters in the Velle at 1/4 turn with aluminum rockers gets a slight noise. I have both cars rev limited at 6500 and both will hit that no problem. Chris Straub told me these setting will very with setup..spring pressure...geometry, etc.....good information though..thanks for posting it...Dave
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  #8  
Old Nov 15th, 10, 1:39 PM
Buffalobillpatrick Buffalobillpatrick is offline
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Default Re: Hyd Roller Valve Adjustment

Engine is 355 with aluminum Brodix IK180 heads.

I have aluminum Scorpion roller rockers, they are noisy when cold.

Smith Bros. 3/8 x .083 wall pushrods & the beehives have titanium retainers.

The springs that my cam card recommends 108/339# dual with damper are not any good for even 6000RPM.

BBP
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  #9  
Old Nov 15th, 10, 6:16 PM
Southern72 Southern72 is offline
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Default Re: Hyd Roller Valve Adjustment

I'm running Comp Pro Magnum roller lifters and they recommend 0 to a 1/4 turn of preload. Seems odd there would be so much difference in adjustment from one brand to another. Here is the instructions.

http://www.compcams.com/Instructions.../COMP4-115.pdf
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  #10  
Old Nov 15th, 10, 7:07 PM
dreis454 dreis454 is offline
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Default Re: Hyd Roller Valve Adjustment

Quote:
Originally Posted by Southern72 View Post
I'm running Comp Pro Magnum roller lifters and they recommend 0 to a 1/4 turn of preload. Seems odd there would be so much difference in adjustment from one brand to another. Here is the instructions.

http://www.compcams.com/Instructions.../COMP4-115.pdf
Same here,I got the #887 Pro Magnum roller lifters in my 454.
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72 ss 454 "W" code,w/cowl induction (how many left?)
matching # LS5 454+.060" 9.2 :1, 2.19/1.88 valves,Comp HR cam 289/295 234/240 .613/.613 110* (dyno'd @ 557hp @ 5400 & 583tq @ 4100)
matching # M22 w/CF dual friction clutch.
Holley 750 HPs dp(82751) on Weiand Stealth & MSD Pro billet HEI
Hedman Elite headers/Flowmaster exh. (w/super 40s)
TC#3095
Garage find parked from 1978-2004

http://macswebs.com/ls5registry/bal/bal.htm
http://www.chevelles.com/showroom/sh...0&ppuser=25834
http://ssregistry.macswebs.com/1972/1d37w2b_reis.htm
http://www.youtube.com/watch?v=YqZkVw6xMkM
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  #11  
Old Nov 15th, 10, 7:34 PM
GRN69CHV GRN69CHV is offline
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Default Re: Hyd Roller Valve Adjustment

Those are the short travel lifters, made to be ran at the top of the lifter against the snap ring. OP is refererencing standard lifters.
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  #12  
Old Nov 15th, 10, 8:01 PM
Holey Moley 64 Holey Moley 64 is offline
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Default Re: Hyd Roller Valve Adjustment

Quote:
Originally Posted by cstraub View Post
Morels,
SBC and LS1 engines should be around .030 to .040" of preload. .030 for iron and .040" for aluminum. On BBC they should be around .040 to .050". Iron aluminum still apply.

In case anyone wants to relate that to turns I had this laying around:

I think its accurate, correct me if I'm wrong. (don't mind the suffixes, I must have been inebriated when I made it)
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  #13  
Old Nov 15th, 10, 8:13 PM
Buffalobillpatrick Buffalobillpatrick is offline
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Default Re: Hyd Roller Valve Adjustment

Hyd roller lifters have a bad reputation in high RPM endurance situations.

Hot oil with air bubbles + high RPM = loss of valve lift.

Possibly Crane thinks setting the plungers closer to the bottom can minimize this.

I have a David Vizzard book where he recommends this.

BBP
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  #14  
Old Nov 15th, 10, 8:39 PM
BowtieAaron BowtieAaron is offline
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Default Re: Hyd Roller Valve Adjustment

i have the same heads and rocker arms.
what cam are you running?

my valve train is noisy with the voodoo 60122 cam.
i noticed more noise after some use from the rocker arms, more so in the trunnion, more side to side movement than up and down.

although with the proper pushrod and the correct adjustment of the valves, they are much quieter than they were before.
and with the patriot springs i have in there 145/420 @ 1.80 IIRC i have revved that engine to 6500 and it has yet to float. with the comp 987 spring, it would float at about 6000-6100.
stock GM hyd roller lifters i am running.

aaron
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  #15  
Old Nov 15th, 10, 8:53 PM
Buffalobillpatrick Buffalobillpatrick is offline
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Default Re: Hyd Roller Valve Adjustment

With a 20 tpi rocker stud, 1 full turn = .050" at the fulcrum of the lever.

The valve end of the rocker is stationary.

If you had a 1:1 rocker, 1 full turn would move the pushrod end .100"

Using a 1.5:1 ratio rocker, this would move the pushrod end .0875"

BBP
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