Are roller rockers supposed to be so loud? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-17-2012, 06:49 AM
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Are roller rockers supposed to be so loud?

I've never used roller rockers before and they just seem too loud to me. I just installed a new sb in a 1970 chevy truck and I can't seem to get the rockers to shut up. Any ideas? Or are they just noisy.

Thanks,

Isaac

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Old 02-17-2012, 06:56 AM
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Hard to tell what your definition of loud is, but yes roller rockers do make noise. Just make sure you have done the normal adjustment to the valve train and your good.
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Old 02-17-2012, 07:39 AM
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Might not be the rockers. Could be wrong length push rods, rocker stud pulling out, or coil bind.
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Old 02-17-2012, 07:48 AM
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I woudn't call them loud.. Mine make a nice, smooth, machanical sound that is enjoyable to me...
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Old 02-17-2012, 08:00 AM
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I experienced a noticable increase in valve-train noise when I switched to roller rockers (Comp Pro Magnums). When I set the lash during original installation, I used a half-turn past zero lash, as recommended for the poly-locks by Comp (hydraulic roller lifters). After doing a little research (primarily on this forum!), I went back and tightened the lash by another quarter-turn, and that reduced the noise considerably. However, the rollers are still louder than the stamped rockers. I think it's just a characteristic of roller rockers, although I have seen claims that the really high-end rollers, like Scorpions, aren't noisy.
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Old 02-17-2012, 08:18 AM
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Well, noisy as in loud enough to be easily heard driving down the road over the exhaust. I adjusted them on 3/4 turn, 1/2 turn, and 1/4 turn. Two get louder the tighter you adjust them.
It's not coil bind. 454 lift on a 560 lift spring with screw in studs. The heads are a new set of Phase 3 bowties.
My buddies truck make a little noise, but nothing like mine. Only have 15 miles on the truck and I will try adjusting again tonight. If It's something I have to live with, I'll just by a set of roller tip rockers from Comp. I'll give up a few ponies for quiet.

Isaac
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Old 02-17-2012, 12:52 PM
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So some are quiet and some are not? They should have an even mechanical sound to them, almost like a sewing machine run at higher rpm. If you are having different noises, more like ticking, then you have something else wrong, collapsed lifter, worn cam lobe, bent pushrod. Pull the offending rocker off and check for contact marks, maybe you need to clearence a few of the rockers(shouldnt have to on quality parts, but sh t does happen)

Once you get everything to your liking, buy a pair of cast alumium valve covers, they will muffle the valvetrain noise even more.
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Old 02-20-2012, 08:16 AM
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Ok, an update. Pulled the two offending rockers off and checked them out. The bearings pivot smoothly and the tips role freely. Checked the pushrods and they are straight. Checked for coil bind and still have plenty of room. Even swapped the whole assembly with a different cylinder. The noise didn't move. It's happening on both the #7 and #8 intakes. At zero lash, everything's quiet, but as I start preloading them, they start making a ticking noise. The more preload, the louder the noise. And as best I can tell, the noise is very obviously coming from the rocker area and not centrally down in the block like it were cam lobes. Just scratching my head here.

Thanks,

Isaac
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Old 02-20-2012, 09:25 AM
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I just read the installation instructions for CompCams lifters and they reckon
one full turn after zero lash.
My Chiltern Camaro manual reckons 11/2 turns after zero lash.
I had 3/4 turn before, I have now gone to 1, kinda inbetweeny.
My roller rockers have some noise, and tall valve covers amplify it.
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Old 02-20-2012, 09:52 AM
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It's just two giving me fits. The other 14 are fine @ 3/4 turn.
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Old 02-21-2012, 01:08 AM
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sticking valves

Could this be 2 sticky valves not quite closing each time guys ?
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Old 02-21-2012, 06:46 AM
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theg, for 4000+ miles aways you sure have quick keys. I was going to suggest the same thing.
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Old 02-22-2012, 12:59 PM
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How about piston to valve clearance? The cam is ground on a 105 intake center line installed 2 degrees advanced which might make for a pretty tight clearance. Zero decked block, flat top piston with 4 eyebrows.
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Old 02-22-2012, 02:56 PM
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You are not the only one that has found comp cams roller rockers noisey.

Assuming the cam is not loosing a lobe or the hyd lifter is not defective,

I use and recomend Scorpion roller rockers.
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Old 02-22-2012, 06:35 PM
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Are you sure that all the pushrods are the same length.

Have you checked for retainer contact on the two offending valves?

What happens if you set those 2 a zero lash and drive it a bit?
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