https://youtu.be/HSAcN2LSqsY

Knock does not start until the engine is up to temp ~80C.

in the video you can slighly hear it at the 6:00 mark and pick up from there. Its at full knock around 10:49.

Thoughts? At this point I suspect a wrist pin, but would love some second opinions. I had to order a compression gauge so I don't have any readings to give yet.

edit: No oil in the water, and no water in the oil.