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Old 08-21-2020, 06:56 PM   #8
Licensed to kill
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Default Re: Engine Knock at 2000 RPM

Originally Posted by Sheldon Paulger View Post
It is knock that was there from day one of the overhaul (but fairly quiet). The knock seems to be getting louder at 2000 rpm and above.

Analysis of the oil shows high copper, iron, lead, and tin.
Copper typically indicates a bearing, likely a main in this case. If it was a throw it would have "thrown" by now. A main can knock for quite awhile, maybe not as long on a 3 main model A as a modern engine but a lot longer than a rod. I would pull the pan and check all of them starting with the mains. Does the knock change with the throttle, IE better or worse when you give it gas or when you let off the gas?.
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