Originally posted by fordification
All I could find.
Air entering the front of the blower case from the throttle-body and air inlet is compressed horizontally along the screw-like rotors of the supercharger that squeeze it into the outlet at the opposite end of the case, hence its designation as a screw-type blower. This design is more thermally efficient than the Roots design used on the Cobra and Lightning, which compresses the air around the outside path of the rotating rotor lobes.
Exactly!! Some Good info there...:thumbsup: