Moparts

Cam,lifter & rocker noise?

Posted By: Keith Richards

Cam,lifter & rocker noise? - 10/31/11 04:49 AM

I have done searches and read many threads on this subject and I have noise which too me seems a bit excessive. My noise comes in about 2000 rpm and runs through 2500 rpm and then is gone again. It sounds like the rockers are not receiving oil in this rpm range. The car is my '72 road runner it has it's numbers matching 400 block in it with a 440 rotating assembly and is 451" 's, car also has a 4 speed so I easily get in this rpm range between shifts. The cam/lifter kit I put in is a Lunati voo doo #60303 with adv duration of 268 int./276 exh. and 0.494 int./0.513 exh.lift. The motor has the Edelbrock 88cc heads with the Edelbrock springs that are supposed to be good for .600 lift. I will say this is the best cam I have had in this motor (I have had a Comp hyd and a MP solid that worked terrible with the 4 speed)as it has awesome torque and pulls great with the 4 speed and 3.55 rear gears.
Somebody told me to switch in a set of the standard Comp #822 lifters would get rid of this as the Lunati lifters are staying pumped up in this range and making noise?
Any comments? Is this similar noise as some of you are experiencing?

Attached picture 6895881-IMG_5394.JPG
Posted By: RapidRobert

Re: Cam,lifter & rocker noise? - 10/31/11 04:58 AM

Quote:

Any comments?

What's your preload?
Posted By: Keith Richards

Re: Cam,lifter & rocker noise? - 10/31/11 05:02 AM

I have played around from 3/4 turn, 1/2 turn and right now a quarter turn, when I initially set the 1/2 turn I had the intake off so I could be absolutely sure the cup was up against the lock. It makes the same noise and in the same rpm range in all of the above.
Posted By: RapidRobert

Re: Cam,lifter & rocker noise? - 10/31/11 05:12 AM

Yeah this is strange that it only acts up in that narrow rpm range. I wouldn't think it'd have a severe drop in psi just in that range. Does it sound like classic lifter clattering from low psi or a different arm/shaft noise or can you tell
Posted By: Keith Richards

Re: Cam,lifter & rocker noise? - 10/31/11 05:40 AM

Noise sounds like rocker arm clatter, oil pressure stays strong and if you hold it in that range for any length of time the noise stays the same. The oil looks clean as does the oil laying in the heads when the covers are off. I have tried different oils 20-50 originally and recently changed to 10-30 to see if that would change the noise, which it didn't. Oil pressure is high and this motor has no more then 500 miles on it since a complete rebuild, may go to a hydraulic roller if I can't figure this out, hate the thought of that expense this winter but would like to try and keep this cam if I can get it quieted down since it works so well, thing sounds like a diesel in that bad range.
Posted By: RapidRobert

Re: Cam,lifter & rocker noise? - 10/31/11 06:19 AM

I wonder if it could be as simple as a bad lifter(s) and breaking in a new set would be the ans? If so it'd sure be the cheapest way to go. Holler how it turns out & good luck
Posted By: 6PACMAC

Re: Cam,lifter & rocker noise? - 10/31/11 11:36 AM

What kind of rockers are you running?
Posted By: MoparforLife

Re: Cam,lifter & rocker noise? - 10/31/11 11:59 AM

Due to ramp design on some of the new cam profiles there seems to be some 'noise' or periods of noise. If it runs good leave it alone.
Posted By: can.al

Re: Cam,lifter & rocker noise? - 10/31/11 03:00 PM

..seems fast rate cams can be noisy
Posted By: superwrench

Re: Cam,lifter & rocker noise? - 10/31/11 03:30 PM

Quote:

Due to ramp design on some of the new cam profiles there seems to be some 'noise' or periods of noise. If it runs good leave it alone.



Every Comp cam or MP cam I've ever used had that "clatter" in that exact RPM range.
Personally, you are NOT going to get rid of it. Like said...it runs fine & you know the lifters are preloaded.....Drive it!!!!
Posted By: RapidRobert

Re: Cam,lifter & rocker noise? - 10/31/11 03:35 PM

Quote:

Every Comp cam or MP cam I've ever used had that "clatter" in that exact RPM range.


That dont sound good but as double R would say ding ding ding we (do) have a winna. (Just me I'd have to go with something else) but at least now we know what's up
Posted By: 383man

Re: Cam,lifter & rocker noise? - 10/31/11 03:44 PM

Some years back I had the MP .484 cam in a 340 Dart and it had the same noise. Never could find anything wrong and it ran great. Ron
Posted By: GomangoCuda

Re: Cam,lifter & rocker noise? - 10/31/11 05:53 PM

I have exactly the same problem with a Crane in mine. It doesn't seem to noticably affect performance, just very annoying. Switched rockers from H.S. to Isky Iron. No difference. Tried all different preloads. No difference. Tried different length pushrods. No difference. Looked to see if rockers were hitting valve covers. Nope. Thought maybe what I really had was a header leak so I changed to Remflex gaskets. No difference. I give up. I'll put a solid in it before I try anything else. Then it will make less noise and have more power. Perfect.
Posted By: WheelsUp73

Re: Cam,lifter & rocker noise? - 10/31/11 06:22 PM

Keith , how much valve spring pressure you running? Anything over 130# on a hydralic cam is excessive and can cause that.
Posted By: MoparforLife

Re: Cam,lifter & rocker noise? - 10/31/11 07:03 PM

Quote:

I'll put a solid in it before I try anything else. Then it will make less noise and have more power. Perfect.

Yes and no. In order to make more power you will need to go bigger with the solid cam. IE: a MP 528 is actually a lesser/milder cam that the 509. Have to take the lash numbers off the solid cam to get effective numbers. Been down that road.
Posted By: GomangoCuda

Re: Cam,lifter & rocker noise? - 10/31/11 07:49 PM

Quote:

Quote:

I'll put a solid in it before I try anything else. Then it will make less noise and have more power. Perfect.

Yes and no. In order to make more power you will need to go bigger with the solid cam. IE: a MP 528 is actually a lesser/milder cam that the 509. Have to take the lash numbers off the solid cam to get effective numbers. Been down that road.



Already knew that. Thanks
Posted By: General 68

Re: Cam,lifter & rocker noise? - 10/31/11 08:12 PM

The 60303 in my 440 has been clattering along for four summers without any issues. Noisy but pulls strong.
Posted By: ERAT340

Re: Cam,lifter & rocker noise? - 11/01/11 03:57 AM

Guys! Its spark knock. This sound fooled me when I was a younger man. Try ta back off your timing, see if it changes.
Posted By: JohnRR

Re: Cam,lifter & rocker noise? - 11/01/11 02:35 PM

Quote:

Guys! Its spark knock. This sound fooled me when I was a younger man. Try ta back off your timing, see if it changes.



That sounds like something to check .

What is intial timing , total timing , all in by , and do you have your vac. adv. connected?

What pistons are you running with those open chamber ebrocks , what is your compression ratio ?

And someone asked , what rockers ?
Posted By: Strawdawg

Re: Cam,lifter & rocker noise? - 11/01/11 03:08 PM

If it does it when the car is not in gear, it is most likely not detonation as there is not enuf to load on the engine to generate the heat required. If you have a vacuum advance disconnect it and see if it then goes away.
Posted By: rustbuckett68

Re: Cam,lifter & rocker noise? - 11/01/11 04:39 PM

I've had that problem in my generic 350 c/w Vortec heads and a semi healthy cam.. I think the retainers are hitting the seals and causing problems. The noise will not 'adjust' away, and timing has no affect. I guess its time for a proper engine, a 360.
Posted By: Keith Richards

Re: Cam,lifter & rocker noise? - 11/04/11 02:32 AM

Thanks for all the replies, I am going to live with it for now. Like I said cam makes awesome power right off idle which works really good with the 4-speed. May eventually slip in a hydraulic roller but it sounds if for now this is just a common characteristic of these newer type cams and there fast ramp rate. I would think the springs are not keeping up but like I said by 2600 it's all quiet again. I emailed Lunati's tech line and I will see what they say.
Posted By: ERAT340

Re: Cam,lifter & rocker noise? - 11/04/11 02:41 AM

Please, rule out spark knock! You can live with it for now but your pistons CANNOT !
Posted By: 383man

Re: Cam,lifter & rocker noise? - 11/04/11 06:38 AM

Quote:

Guys! Its spark knock. This sound fooled me when I was a younger man. Try ta back off your timing, see if it changes.



No not the noise I had as it did it in Park. Ron
Posted By: Keith Richards

Re: Cam,lifter & rocker noise? *Updated* - 11/20/11 03:42 AM

Well,after talking to Lunati tech they suggested I put in stock type lifters????? So I pulled the intake and started taking the Lunati lifters apart and putting them back in there respective galley. Got to the 15th one on the intake of #8 and it was collapsed, the inner plunger was stuck at the bottom of the lifter. Took a bit getting it out and cleaned up the inner bore of the lifter with rolled up 80 grit and got it working free like the others. Double checked the lash at 1/2 turn past zero, started it up and after 10 minutes at about 1800 to get all the lifters full of oil I think my noise is just about all but gone. Took it for a short drive and 1 lifter left with the smallest of tick's. Gonna take the car out tomorrow if it is dry and see if I can get that to go away.
Posted By: RapidRobert

Re: Cam,lifter & rocker noise? *Updated* - 11/20/11 05:32 AM

(1) Lunati lifter was fubared and possibly one other is also slightly & prob nearly solved w no expenditure for new parts ex gasket(s). You dug in & (hands on) solved the prob . That's a success story
© 2024 Moparts Forums