M20B25 knocking noise starts from 2500rpm

[Radioactive]

Hello,

When accelerating, I have a knocking noise exactly like in this video: http://www.youtube.com/watch?v=_3m_70jkINA

It starts from 2500-3000 rpm. Valves are adjusted and double checked. Is there sense go for a thicker oil, in example 10w60?

[jlevie]

I can't access the video from work, but my suggestion is for you to have pro look at the car. A knocking noise could be from a bad bearing.

[Radioactive]

Knocking becomes noticeable when engine is warm up. When engine is cold seems that everything is ok.

[jlevie]

I'm home and listened to the sounds in that video. If yours sounds the same I'd say that the most likely explanation would be a bad bearing. The only fix for that is a replacement engine or a rebuild. But before going there, have a pro diagnose the nosie.