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But with all the Whipple issues? The 2650 is the blower that a lot of the Mustang guys upgrade too and basically all of the GM guys go to.
The GM guys. Magnuson has the GM market wrapped up for all the LT4 cars just as whipple has the hellcats. No need to R&D to compete plus magnuson had the older 2650 for the hellcat. And whipple only had problems on the hellcats. They are rock solid for other platforms.
 
Opcon group's SRM division owns the rights to twin-screw technology, of which there are three:
  • Autorotor (roots style) - Eaton, formerly Whipple, and formerly Kenne Bell
  • Lysholm (twin-screw) - used by IHI and formerly Whipple
  • Sprintex

Lysholm was founded by a designer who left Autorotor. The early Lysholm 1600 and 2000 models were basically copies of the Eaton design but went from roots to twin-screw.
Sprintex was originally based on earlier Lysholm designs

Both Kenne Bell and Whipple now create their own rotor packs. Whipple had a license for the Lysholm design, and I believe Kenne Belle licensed the Autorotor design. Not sure if they still do or not.

IHI and Eaton still license designs from Opcon.

Eaton TVS 2650 rotor packs are sold to many others who build products around them, such as Magnussson and Edelbrock (who makes their own casing for the Eaton rotors).

This looks like Kong is now sourcing the TVS 2650 rotors and creating a casing to fit the Gen 3 hemi for it similar to the IHI casing for the Lysholm rotors.

Note: the above history from my notes may be incomplete or inaccurate--it's collected from various sources I found, and they don't all agree.
 
My understanding is that the roots style is slightly less efficient than the twin-screw design. However, being a symmetrical 4-lobe design it's much easier on the bearings and can spin faster to make up the difference and is probably much more reliable to overspin--unlike the IHI that likes to burn up the male rotor bearing when over spun since it's spinning 5:3 of the input shaft speed.
 
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