Originally Posted by waldig
The video was at idle and thus the S/C could not be engaged. IT is the idler , accessories, or S/C clutch bearing. Unless you are in gear and under load the S/C does not run so I'd tell you that it is not in the S/C. Bearings yes, now which one?
Keep listening Woody
It might not be "engaged", but it still spins at idle (either due to engine vacuum, bearing friction on the supercharger pulley, or both; take your pick). I wouldn't say rotor bearings or rotor to case contact is out of the question.