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Depends...are you talking about bearing (bottom end) knock, or spark knock (detonation, pinking, etc?)

They actually sound similar but one comes from the bottom end and the other comes from the top end. Both occur under load at moderate RPMS. One is more serious than the other.

Spark knock sounds like chattering in the cars I've heard it in.....kinda like trying to accelerate from 1000rpms in 5th going uphill. Bearing knock is more of a rumbling sound I believe.

Tyson
 
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