Paul,

   Have you been following the Norton NRV500/700 motorcycle news.  They ran
   173mph at Bonneville in 2010 with this engine.

http://www.asphaltandrubber.com/racing/norton-racing-nrv588-179-mph-bonneville-salt-flats-bub-week-part-2/

   I can't seem to find any specs on the engine anywhere.

   Mark S.



http://en.wikipedia.org/wiki/Wankel_engine

This link may help. At the very bottom there is a little scoop about the
Norton.
One chamber has 588 cc as the name implies. A larger 700 cc chamber size
is being planned.

Rolf