Originally Posted by RalliartN
Narrow it down: is knock inside the engine? or from outside/underneath the engine? or a heat shield resonating at certain rpm?
You say its not from a part driven by the accessory belt, so we can rule those out.
Maybe a fastener has loosened and a part is not bolted down securely, or a plastic/metal fastener has broken. What did you last work on?
The knock appears to be in the engine, but i can't really tell. The last thing i did was take off the belt. At this point I'm not sure what to do other than tear it down. I was just surprised because no power loss and the noise goes away when i rev up just a little. If the beating is spun around would it effect the compression enough to notice on a compression check?