|
I think Frank's right, it's just a different (more complicated and expensive) method to achieve the same result. With a single screw in a pipe it isn't even a positive-displacement device, so you would have air bleed (drawing air through the passage) and would not be able to super-charge. A twin-screw Lysholm supercharger would be able to be slowed down as a restriction or sped up to provide positive pressure, but the control system to do this as a primary engine speed control device would be VERY complicated (not to mention the safety aspects of a motor-driven device as the motor speed control?).
The best system I have heard of yet was BMW's Valvetronic, where electronic valve lift control was the "throttle" limiting the amount of air allowed into the cylinders. This was better because it kept port flow velocities high and allowed better mixing of the air and fuel at light engine loads.
__________________
|