Quote Originally Posted by sseilmnop View Post
Never clean rotors.

Find a used supercharger with good rotor coating.
^This

I bought lots of rotor packs from Ed Morad years ago for replacing the ones in Ford SC's (modified of course to fit) and never cleaned the coatings becasue the epoxy (not Teflon) will come off pretty easy. I also used to upgrade the early Ford M90's with the bare rotors to the coated rotors. Those superchargers would pick up about 1-2PSI. But it's not a apples to apples comparison since the porting and drive ratio are completely different with the early M90's verses a Gen 3 M90.

I think Embree Machine works still does rotor coating by the way. They are also known as ESM

Jeff