Noisey Valve Train??

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Oct 6, 2003 | 05:11 PM

autotech

Thread Starter

Racer

Joined: Oct 2003

Posts: 273

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From: Midland Texas

Noisey Valve Train??

I own an automotive shop and recently puchased an 88 corvette for me personally. After considering several factors I decided to overhaul the engine. While I was in there I installed a mild "Comp. Cam", Z-28 valve springs at the sugestion of my machinist. Anyway, before I overhauled the engine, I thought the valve train was noisey. After overhauling the engine, it still sounds noisey to me. Sounds like wore out flat tappet lifters. Is it common for a little valve train noise with roller set-ups?

Oct 6, 2003 | 06:39 PM

grapeknutz

Le Mans Master

Joined: Nov 2002

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From: Corvette valley Georgia

St. Jude Donor '06

Re: Noisey Valve Train?? (autotech)

It could be you are hearing the injectors ticking, thats normal.

Oct 6, 2003 | 06:43 PM

scorp508

Team Owner

Joined: Mar 2000

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From: Boston, MA

How much did you turn the nuts past 0 lash on the rockers?

Oct 6, 2003 | 06:45 PM

65Z01

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From: SE NY

Cruise-In II Veteran

Re: Noisey Valve Train?? (autotech)

It can depend on valve lash setting too; I set my valve train cold to 0-lash plus 5/8 turn with ProMagnum RRs. I believe I have a little valve train noise but it's hard to distinguish from the ram-air intake and injectors.

Use a piece of rubber tubing as a stethoscope to determine if the noise if from injectors or the valve train.

Oct 7, 2003 | 08:44 AM

autotech

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Racer

Joined: Oct 2003

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From: Midland Texas

Re: (scorp508)

I adjusted the rockers 1 full turn past zero lash - cold...

Oct 7, 2003 | 08:47 AM

autotech

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Racer

Joined: Oct 2003

Posts: 273

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From: Midland Texas

Re: Noisey Valve Train?? (65Z01)

It is the valve train, I may be being over cautious - motor runs great - just noisey up there...

Oct 7, 2003 | 09:21 AM

Nathan Plemons

Race Director

Joined: May 2001

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Re: Noisey Valve Train?? (autotech)

Some rockers are just loud. I know my Scorpions are louder than my Cranes were.

Oct 7, 2003 | 09:33 AM

scorp508

Team Owner

Joined: Mar 2000

Posts: 83,383

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From: Boston, MA

Quote:

I adjusted the rockers 1 full turn past zero lash - cold...

These are the stock stamped rockers, right? Did you adjust them in the order the service manual calls for? I like to adjust mine cold to get them close and then readjust them with the engine running. I always end up with 1 or 2 clacking pretty badly when I do them cold.