Coating Valve Covers to reduce valvetrain noise/false knock
Registered User
Joined: Dec 2003
Posts: 2,724
From: Oklahoma where trees are made of wood.
But yeah the noise is because the parts are connected to the block not from reverberation off the covers etc.
Administrator
Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
Um that's incorrect. the LT4 used 1.6 rollers that the lt1 vette did not which caused false knock which is why there is the LT4 knock module and LT4 composite covers. do some research. Also the fact that the sensor is in the block doesn't mean it doesn't register outside interference such as exhaust.
The covers would be somewhat effective in minimizing noise emitted outside the engine, including to the passenger compartment. That may well have been the deciding issue.
The 92 Corvette LT1 valve covers were magnesium. In 93 they were replaced with plastic. Ref:
Magnesium is expected to roll up lots of new applications in the '90s, but it recently lost a round to a thermoset plastic on the '93 model Corvette. American Cyanamid Co. of Wayne, NJ, replaced the light-weight the cast metal on the valve covers of Corvette's 5.7L LT-1 engine with its Cyglas high-performance thermoset material.
Doing a bit of research is always a good idea.
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