another ls7 rocker failure

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Sep 11, 2006 | 02:04 PM

#21

vtanju

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Quote:

Originally Posted by Greg Fell

are you using a lash cap? the ti intake valves are not hardened, and will wear out very quick. you MUST use a lash cap.

thanks alot buddy, i did not know this. almost destroyed another set, guess i can buy the lash caps from GM right.

thanks again

Sep 11, 2006 | 02:07 PM

#22

LeMansBlue04

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Quote:

Originally Posted by vtanju

hi guys,

the problem i had was that the tip titanium of the intake valves where the rockers are in contact wear out, and i mean wear out fast like in 2 hours of operation. exhaust is fine. any ideas.

Carefully check your valve train geometry. I saw a recent case where AFR had a customer who set up his valve train incorrectly. His pushrods were to long resulting in only half or 1/3 of the valve stem working against the rocker arm pad. Most of the contact was on the outer edge of the valve stem. This caused excessive pressure and wear in one spot. It quickly wore through the hardened surface of the SS valve stem. After you penetrate the hardened surface a valve wears very quickly.

Ah, there's the answer in the post above. I was wondering how a Ti valve can be hardened.

Sep 11, 2006 | 02:14 PM

#23

Greg Fell

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From: Morton IL

yes, and you can order custom thickness ones from vacmotorsports...ask for chris. i recommend using custom ones to get your valvetrain geometry dead nuts on

www.vacmotorsports.com