Quote:
Originally Posted by Jackstand Queen
Are the Rotrex's whipple types? Their insides look like giant air screws.
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No, the Rotrex superchargers basically mate a turbo-like compressor to a belt driven system. Planetary rollers are used to get the compressor to spin in the high RPM range.
This means that the Rotrex superchargers are not positive displacement like a twin-screw or Roots type supercharger. So the boost is not constant over RPM with the Rotrex, but tends to increase with increasing RPM. You won't get the same initial low RPM torque like you will with a positive displacement supercharger, but the boost will increase fairly linearly with RPM which is much more predictable than the spool of a turbo.
Some people like how the linearly increasing boost tends to offset the engine's natural falloff of volumetric efficiency in the higher RPM ranges.
-div0