Originally Posted by Greyhare
A screw type supercharger would be more compact than an x-71 but would still require very expensive fabrication work to mount it to the engine.
The Eaton rotor groups are tested to 20000rpm The ~14000rpm design limit is based on diminishing returns from heat. (The added heat hurts you as much or more than the added air helps.)
As far as not flying appart is concerned, I don't know if Eaton or Magnuson have tested beyond 20000rpm. The test speed is far enough past the rated speed to make it point less to go higher, unless they just like destroying stuff.
I will be spinning beyond the factory test limit this summer. Based on my 'Jet' redline of 6000 rpms:
Based on a crank pulley diameter of 6.9", my 2.2" pulley is spinning at 18,800 rpms.
My summer 'track' pulley will probably be a 2.0" pulley, and will spin at 20,700 rpms.