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

 Rolf,

 Did you mean to state that the 588 was a 2-rotor? According to the
 link, the 588 is a 2-rotor.

 "Norton has used a Wankel engine in several models including the
 F1, F1 Sports, RC588, RCW588, NRS588, most notably Steve Hislop
 riding to various victories on Norton's F1 in the TT in 1992.
 *Norton now makes a 588cc twin-rotor model called the NRV588* and
 is in the process of making a 700cc version called the NRV700."

 Mark

 Marc

 The Norton Rotary has 588 cc displacement per chamber. That compares
 to 654 cc in the Mazda's, RX3 to RX8, they all have the same displacement
 per chamber.

 Norton started out with a single rotor and later build two rotor
 versions of the same basic design with 588 cc chamber size. The new
 NRV588 and NRV700 with 700 cc displacement per chamber are twin
 versions, as per the company statements.

 In other words the 588 is not far from the 654 Mazda is using.
 Perhaps for smaller hp needs a Norton 588 single could be used.
 Likely that would be simpler than reducing the Mazda to a single
 rotor version. Even the twin might be suitable for aircraft use.
 Paul probably has more insight into that.

 Rolf

 Rolf,

 The RX2 and RX3 engines were 1146 or 573 per chamber. The RX4, Cosmo
and later
 engines; 654 per chamber. Early RX7's had 12A and then 13B engines.
The 12A is
 closer to the Norton. What is the rotor radius, eccentricity, "a" and
rotor
 width? Almost all the Mazda engines shared dimensions except the
rotor width.

 Dale Davies

Norton bike rotaries are 588 and 700 ccm total displacement, not per
chamber. All including early air-cooled versions were 2-rotor. The new
motor would be very pricey alone, even if it does become available, as
production numbers will be very small for now. Being most motorcycles
are of unit construction, that is motor, primary drive, and transmission
sharing same castings splitting components may be a problem. I know
where there sits a '90's F-1  sport bike version, but plastic would have
to come off to find out. I see nothing but problems. Mazda motors are
dime-a-dozen respectively.

Sincerely,

Al Koivisto