I've been getting some engine vibrations, and read somewhere that the SC Clutch and SC Pulley are supposed to spin freely. I was checking my engine out and noticed when at idle, both of mine spin together. Is that normal, or do I have a problem?

Code3 SC Pulley BTW.

Its normal for the clutch to spin when its not engaged as far as i know.

Thanks for the clarification . This vibration has really got me concerned.

I'm having my own SC questions these days to, but to add to my last post.

Air is being sucked in when that air hit the rotors it causes them to move in turn spinning the clutch the air that is coming in is not fast enough to make any boost, its when the clutch is engaged that it spins fast enough to start sucking air and ramming it into your engine.

Its kind of like a windmill effect. its just the air thats moving the rotors not a mechanical force. Or say like a fan in a window that is off just blowing in the breeze.

I would add that the gap between the plates of the SC clutch is very tight and there is just enough light contact to spin the impellers a little when not engaged. However, if you carefully applied friction to the SC side of the clutch (not the pulley side) you can stop the SC from spinning.

Regarding your vibration. Can you hear it or feel it? Does it stop when the SC is slowed using friction? or does it remain? If it is still audible, take a length of rubber hose, with engine idling and taking extreme care to not get it into the pulleys or belt, listen to each pulley bearing and you will likely find one that is making a racket. I ended up replacing both my SC pulley bearing and the middle idler pulley and am about to replace the top idler as well. Those all take a beating but are cheap and easy to replace. Better to spend a little to replace as end up stranded somewhere. Usually the SC internals do not go bad, but as Hooley painfully knows, that is not 100% true.

Irish