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Author Topic: problems with Comp Cams hydraulic roller lifters on 440  (Read 2308 times)

Offline PlumCraZRT

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Re: problems with Comp Cams hydraulic roller lifters on 440
« Reply #15 on: June 11, 2016 - 06:48:55 pm »
...second, the valve train geometry will be off side-loading the valves in operation, possibly bending a valve stem enough to bind in the guide.

If this is a big block (like the subject suggests) with a rocker shaft, the rocker to valve geometry does not change with pushrod length.  You're thinking of a small block chevy, etc where the whole rocker moves to adjust preload.
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Offline 734406pk

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Re: problems with Comp Cams hydraulic roller lifters on 440
« Reply #16 on: June 12, 2016 - 12:35:56 pm »
If this is a big block (like the subject suggests) with a rocker shaft, the rocker to valve geometry does not change with pushrod length.  You're thinking of a small block chevy, etc where the whole rocker moves to adjust preload.

I'm probably over-thinking this part but what are your thoughts on push rod length moving it's cup and ball pivot point further away from the centerline of the rocker shaft?  I'm thinking (wrong maybe) that will decrease the effective lift similar to a 1.5 ratio rocker vs a 1.6 (extreme example).  Agree 100% on the Chevy! I've seen it happen!  :scared:
1973 Challenger 440 6 pack auto 3.91 rear
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Online brads70

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Re: problems with Comp Cams hydraulic roller lifters on 440
« Reply #17 on: June 12, 2016 - 12:48:39 pm »
I'm probably over-thinking this part but what are your thoughts on push rod length moving it's cup and ball pivot point further away from the centerline of the rocker shaft?  I'm thinking (wrong maybe) that will decrease the effective lift similar to a 1.5 ratio rocker vs a 1.6 (extreme example).  Agree 100% on the Chevy! I've seen it happen!  :scared:

It won't change the ratio but might roll off the valve tip as it won't be centered like it should be during the rocker arms travel.    Bottom line.... no don't do it. :D
Brad
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Offline 734406pk

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Re: problems with Comp Cams hydraulic roller lifters on 440
« Reply #18 on: June 12, 2016 - 12:58:20 pm »
It won't change the ratio but might roll off the valve tip as it won't be centered like it should be during the rocker arms travel.    Bottom line.... no don't do it. :D

 :iagree:
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive

Offline HP_Cuda

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Re: problems with Comp Cams hydraulic roller lifters on 440
« Reply #19 on: June 13, 2016 - 12:51:06 pm »

Or get custom length pushrods to match what you got!
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Offline multiflu

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Re: problems with Comp Cams hydraulic roller lifters on 440
« Reply #20 on: September 04, 2016 - 06:29:41 pm »
hay
went on a business trip for a long time had just returned!
and back to old problems  :working:  ))))))

I ordered a new spring!
but i am not sure that srings will solve the problem! i did not run my engine more then 2500rpm? and the whole trip was 10 minutes long
lifters stuck at the bottom and its not 1 or 2 ITS 7!!!
3!!! pushrods pop out(they jumped out on top, from the rocker arm)


I hope that this spring - it will explain a problem with pushrods, but all NEW hydraulic roller lifter! and its not 1 broken, its like every  second!
I do not believe that compcams is that ****'y
« Last Edit: September 04, 2016 - 06:33:37 pm by multiflu »
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Offline HP_Cuda

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Re: problems with Comp Cams hydraulic roller lifters on 440
« Reply #21 on: September 04, 2016 - 08:00:19 pm »
Just an update, my prob was my machinist did set the lash correctly hence a loud valve train.

The one thing that keeps resonating with comp lifter problems is under rated springs. So if you are going to run .600 lift you better get a spring rated higher than that to be on the safe side (I.e. .650)

Keeping my fingers crossed I never see these probs but she is running beautifully now.
1970 Cuda Clone 440 4 speed - sublime green
1970 Cuda 383 4 speed - yellow - SOLD

Offline Chryco Psycho

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Re: problems with Comp Cams hydraulic roller lifters on 440
« Reply #22 on: September 04, 2016 - 11:06:16 pm »
I do not believe that compcams is that ****'y

Really , I sure do from experience  :2cents:

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