MTBSully

iTrader: (7)

Been having a problem lately. My car runs grea and sounds good when the motor is cold. Continues to run great until the car reaches operating temp. 5-10 minutes after the car reaches operating temp, the rockers/valvetrain start making a loud sewing machine sound (Louder than pro mags should be). My guess is that it has something to do with the oil thinning out? Do i have a lifer problem? Should i try readjusting the rockers? Oil pressure is 62-65psi while cruising and around 40psi at hot idle. Thanks guys

jayz28

iTrader: (3)

I've got the same problem and I also have pro mags. After engine gets hot, it begins getting noisey...

kinglt-1

iTrader: (26)

I kind of thought my promags got louder when fully warm too.

ryle

iTrader: (19)

It's not just the Pro Mags, I have CAT brand rockers and they do the same thing. Switched back to a thicker oil and the problem is less apparent, but is still there.

MTBSully

iTrader: (7)

yeah, but it never used to do this until i collapsed a lifter last week. I thought it had pumped it self back up though. This is weird

96blackz28

iTrader: (3)

Loose rocker?

95ztrey

mine do it to i have harland sharp ...

JAKEJR

Could be oil weight, or the rockers being used or not enough of lifter preload.

Crane issued a Tech Bulletin some time back saying increasing preload can cure excessive noise.

I use Scorpions 1.7s and my son's Scorpions are 1.7/1.65 with Mobil 1 10W40 and ours are super quiet. No louder than stock with 3/4 turn preload.

Jake

West Point ROCKS!

camar0corey

iTrader: (22)

My promags are really loud at 3k+, but opposite for me, they are louder when cold, but still very audible after reaching operating temp.

I'm always wondering how everyone has 35+ psi hot oil pressure. I have like 15-20 psi at operating temp at idle. I see 60+ psi only when its cold. I"m not worried, but damn seems like PSI is all over the board engine to engine.

myltwon

iTrader: (1)

steel rockers are pretty much always going to be louder than an aluminum body one (aftermarket stuff atleast)

I know my comp magnums were louder than my proforms

ADM

I am also getting pro mags, but I don't want them to be too noisy. How loud are they going to be? Its not going to sound like a diesel, is it?

myltwon

iTrader: (1)

like a quite sewing machine

AChotrod

iTrader: (17)

Mine also would get louder when warm , but not much.

old93camaro

iTrader: (8)

i have Crane gold roller rockers that are 1.6 which are loud as well i have tried everything to quiet them down my next is the value covers and i hope that help

JAKEJR

In the past few days, two guys have posted photos of their Pro Mags that exploded. When Comp was called the Tech guy said it looks like bad porous rockers. Comp's replacing the rockers, but I don't know what else they'll cover.

One guy's now pulling his engine to find and remove all the bearings.

Just a word of caution.

Jake

West Point ROCKS!

ADM

Yea, I saw the pictures. Thats bad joojoo for any engine if you ask me.

But one rocker breaking out of thens of thousands produced does not mean they produce a bad product.

Are there quiet better alternatives that you know of?

myltwon

iTrader: (1)

problem is though it seems like when comp has a problem it's an entire run not just 1 bad lemon out of a giant batch. such was the story with the one spring style and comp r lifters

ADM

What brand would you use?

Its nice of them to back their product with a life time warranty.

pyro719

iTrader: (5)

My crane golds are noisy as well once warmed up. Im going to go to a thicker oil.

camar0corey

iTrader: (22)

I wouldn't say quite like a diesel. Here is a vid of how mine sound:Yes I'd say more like a sewing machine.