Lysholm instead of root type...
There are twin screw blowers in use on some LSx's They are just not as common due to cost, and lack of kits.
This is the same style as kenne bell blowers. But in my case (yamaha) I have a Opcon autorotor unit
This is the same style as kenne bell blowers. But in my case (yamaha) I have a Opcon autorotor unit
Sorry, but you are wrong. A Roots is a twin lobe, not a twin screw.
Sorry, but you are wrong. A Roots is a twin lobe, not a twin screw. 
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Opcon also makes the Lysholm line that used to be used by Whipple. Now Whipple is making their own superchargers.
All of the above are twin screw.
Andrew






