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Re: Hemi Rocker adjustment
[Re: calrobb2000]
#2944786
07/19/21 10:45 AM
07/19/21 10:45 AM
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Joined: Feb 2007
Posts: 217
New Port Richey, Florida
Wolfe440
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OP
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Posts: 217
New Port Richey, Florida
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if this is a cam with fast ramps you are prob going to have some noise !
Its a roller, I was hoping it would be quiet. Its a Comp Cam 24 600 11 Intake Valve Lift with Factory Rocker Arm Ratio: 0.536 in. Advertised Intake Duration: 283
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Re: Hemi Rocker adjustment
[Re: NITROUSN]
#2944801
07/19/21 12:07 PM
07/19/21 12:07 PM
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Joined: Feb 2007
Posts: 217
New Port Richey, Florida
Wolfe440
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New Port Richey, Florida
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Are the adjuster screws 3/8 fine thread? If so that would equate to .0416 per turn. So 1 1/4 turns come out to .0520 preload. They claim most lifters have up to .200 of adjustment for preload. If the Cam and lifter company is suggesting this I guess it is worth a try. Pulled an adjuster this morning and they are 3/8 fine thread, they're in fact a 3/8 - 24 thread. I will go with a final 1 1/4 turn and see if it helps. Thx
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Re: Hemi Rocker adjustment
[Re: Wolfe440]
#2944952
07/19/21 08:57 PM
07/19/21 08:57 PM
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Joined: Jan 2003
Posts: 15,311
Omaha Ne
TJP
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I Live Here
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Omaha Ne
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Are the adjuster screws 3/8 fine thread? If so that would equate to .0416 per turn. So 1 1/4 turns come out to .0520 preload. They claim most lifters have up to .200 of adjustment for preload. If the Cam and lifter company is suggesting this I guess it is worth a try. Pulled an adjuster this morning and they are 3/8 fine thread, they're in fact a 3/8 - 24 thread. I will go with a final 1 1/4 turn and see if it helps. Thx That's a bit too much preload IMO  BTW, There's an old saying about valves, It's better to hear them than to smell them  
Last edited by TJP; 07/19/21 08:58 PM.
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Re: Hemi Rocker adjustment
[Re: Wolfe440]
#2945097
07/20/21 10:46 AM
07/20/21 10:46 AM
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Joined: Feb 2013
Posts: 141
Missouri
randavis
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member
Joined: Feb 2013
Posts: 141
Missouri
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I'm having a similar problem with my 440 based 511. The engine builder speced a custom grind Comp cam. I had wanted hydraulic rollers due to less maintenance. Duration @ .050 Intake 243 Exhaust 251, 595 lift on 113 ICL using 1.6 Hughes roller tip rockers. When I started it up, it sounded like solids that were loose. I took the engine back out of the car and took it back to him. He pulled the heads and took them apart and checked everything. He has them adjusted 1-1/2 turns. Nothing wrong. I put the engine back in the car and it was just as noisy as before. I loaded the car onto my buddy's trailer and we drove the 120 miles to his shop. When I started it, he was surprised at how noisy it was. We decided to change to solid roller lifters, as he said that he was sure they would be quieter when properly adjusted. The car is at his place now, but he just had knee surgery. I don't know how long before the car will be ready.
I did find a tech sheet on Comp Cam's web site that stated that the hydraulic rollers tended to be noisy.
I don't know if your issue could be related or not. This came to mind when I read what you have going on.
Last edited by randavis; 07/20/21 10:47 AM.
74 Challenger, bought it new. In 1978 I replaced the original 318 with a 446 and 727. Mild cam, Jardine headers, and Holley Sniper EFI.
New engine! 511" RB, Edelbrock Performer RPM heads, Eagle rotating assy, Comp hyd roller cam, Doug's 2" headers.
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Re: Hemi Rocker adjustment
[Re: randavis]
#2945143
07/20/21 12:06 PM
07/20/21 12:06 PM
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Joined: Feb 2007
Posts: 217
New Port Richey, Florida
Wolfe440
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OP
enthusiast
Joined: Feb 2007
Posts: 217
New Port Richey, Florida
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I'm having a similar problem with my 440 based 511. The engine builder speced a custom grind Comp cam. I had wanted hydraulic rollers due to less maintenance. Duration @ .050 Intake 243 Exhaust 251, 595 lift on 113 ICL using 1.6 Hughes roller tip rockers. When I started it up, it sounded like solids that were loose. I took the engine back out of the car and took it back to him. He pulled the heads and took them apart and checked everything. He has them adjusted 1-1/2 turns. Nothing wrong. I put the engine back in the car and it was just as noisy as before. I loaded the car onto my buddy's trailer and we drove the 120 miles to his shop. When I started it, he was surprised at how noisy it was. We decided to change to solid roller lifters, as he said that he was sure they would be quieter when properly adjusted. The car is at his place now, but he just had knee surgery. I don't know how long before the car will be ready.
I did find a tech sheet on Comp Cam's web site that stated that the hydraulic rollers tended to be noisy.
I don't know if your issue could be related or not. This came to mind when I read what you have going on.
Interesting, like to hear what fixes it. I can tell some of the rockers are reasonably quiet, I can hear three or four on each side, some slight tap and some loud, changes with RPM. Comp Cams tells me the Thumpr roller cams in many cases may need a full turn or a little more to get them to mellow out. Of course you find this out after they sell it to ya. I'm close to trying new lifters.
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Re: Hemi Rocker adjustment
[Re: Wolfe440]
#2945148
07/20/21 12:15 PM
07/20/21 12:15 PM
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Joined: Aug 2003
Posts: 43,126
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,126
Bend,OR USA
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I used one Hydraulic roller lifter cam kit from Comp years ago in a street hemi motor for a local customer, I could not make it quiet no matter what way i set the preload  It sounded like a old 30-30 Duntov solid lifter cam that came in the early Corvette motors  The customer ended up saying don't worry about it after driving it. I heard later that Comp Cams sent back 1500 sets of that brand hydraulic lifters for all motors, not just Mopar BB V8. Evidently they bought a bunch of defective hydraulic roller lifters  OP, how old are yours?
Last edited by Cab_Burge; 07/20/21 12:16 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Hemi Rocker adjustment
[Re: moparx]
#2945220
07/20/21 03:06 PM
07/20/21 03:06 PM
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Joined: Feb 2007
Posts: 217
New Port Richey, Florida
Wolfe440
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Posts: 217
New Port Richey, Florida
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what did it sound like on the dyno ? He said it sounded good, sent me the results and the motor is produced 499 HP on the Dyno. I doubt that would have happened with a set of bad lifters. The motor was nicely stored and well covered in my shop for the next two years, primed it once a month and turned it by hand couple times a month. He does not see how that would cause a problem.
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Re: Hemi Rocker adjustment
[Re: Wolfe440]
#2945370
07/20/21 08:46 PM
07/20/21 08:46 PM
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Joined: Jan 2003
Posts: 15,311
Omaha Ne
TJP
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I Live Here
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Omaha Ne
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Is this normal to find after shut down? Should they all hold their pressure? They should hold the oil (pressure) and if not I would say they are dirty or bad lifters due to excess clearances and are bleeding down. call Barton and buy a set from him  only other reason I could think of is excessive spring pressure It seems as though Comp's once trusted quality has been slipping for quite a while IMO 
Last edited by TJP; 07/20/21 08:53 PM.
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Re: Hemi Rocker adjustment
[Re: TJP]
#2945544
07/21/21 11:38 AM
07/21/21 11:38 AM
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Joined: Feb 2007
Posts: 217
New Port Richey, Florida
Wolfe440
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OP
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Posts: 217
New Port Richey, Florida
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Is this normal to find after shut down? Should they all hold their pressure? They should hold the oil (pressure) and if not I would say they are dirty or bad lifters due to excess clearances and are bleeding down. call Barton and buy a set from him only other reason I could think of is excessive spring pressure It seems as though Comp's once trusted quality has been slipping for quite a while IMO I called Ray Barton, very nice man, his first bit of good information is to never go hydraulic with a Hemi, he's had nothing but major trouble and will never use them again, says the valve train is too heavy and it will lead to many problems, including bleed down when engine is shut down depending on the position of the lifters. He was not surprised I can't get them to stop rattling, and told to stop adjusting further, I'm just asking for big trouble. The hydraulic that came from the factory used special lifters that could handle the pressures but are no longer available. We discussed going to solid, I have to first contact Comp and see if the cam I have can switch to solid lifters, I will also have to change to a different length push rod. Thank you TJP for telling me to contact him, it has likely saved me from a bigger problem! Update: I called Comp and yes with this roller cam I can switch to solid lifters, what a relief! I am waiting for Ray Barton to call me back with a lifter and push rod solution.
Last edited by Wolfe440; 07/21/21 12:19 PM.
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Re: Hemi Rocker adjustment
[Re: Wolfe440]
#2945811
07/21/21 09:09 PM
07/21/21 09:09 PM
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Joined: Jan 2003
Posts: 15,311
Omaha Ne
TJP
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I Live Here
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Omaha Ne
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You're more than welcome and glad you made the call. I'm a 67 YO engineer that has been restoring and repairing customers classic cars for the last 25 or so years. I changed my first clutch in my brothers car (47 Ford closed driveline) at 13 years old in a gravel parking lot using a large piece of cardboard to lay on and have been at it ever since. So many times it appears the advice WE, (myself and other old farts) give falls on deaf ears. Might also want to ask him for a cam recommendation Good luck and keep up posted
Last edited by TJP; 07/21/21 09:16 PM.
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Re: Hemi Rocker adjustment
[Re: TJP]
#2946003
07/22/21 12:13 PM
07/22/21 12:13 PM
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Joined: Feb 2007
Posts: 217
New Port Richey, Florida
Wolfe440
OP
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OP
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Joined: Feb 2007
Posts: 217
New Port Richey, Florida
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You're more than welcome and glad you made the call. I'm a 67 YO engineer that has been restoring and repairing customers classic cars for the last 25 or so years. I changed my first clutch in my brothers car (47 Ford closed driveline) at 13 years old in a gravel parking lot using a large piece of cardboard to lay on and have been at it ever since. So many times it appears the advice WE, (myself and other old farts) give falls on deaf ears. Might also want to ask him for a cam recommendation Good luck and keep up posted In 1977 I was 17 and my first car was a GTX 440-6. Had only a pair of pliers and zero knowledge how to keep it running, but I got by somehow. I screwed up more then I fixed in those early days. I am waiting to hear from the engine builder regarding me switching to a solid lift before I go do it. Comp Cams said yes the roller cam I have can be switched to solid lifters,... but its on me. So like when I was 17 years old, here I am again at 62 trying not to screw it up more!
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Re: Hemi Rocker adjustment
[Re: Wolfe440]
#2946053
07/22/21 02:38 PM
07/22/21 02:38 PM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
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I Live Here
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Mass
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the Pertronix took a crap, how nice.., got a new one coming.
Pertronix I...?
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