George, great info.  I have wondered if you could use the rx8
rotors in an earlier 13b.  The lighter rotors would allow us to
turn higher rpm safely.  If you
 are using a PP intake port this sounds like a less expensive route
than a new rx8 engine.  Looks like you would need rx8 rotors,
seals, and front/rear
 counterweights to make this work.  Maybe the 86 - 91
counterweightes can be used if the rotating assembly is balanced.
Does anyone know if weight would have
 to be added or removed from the counterweights to work with the
new rotors (seems like the weight would need to be removed from the
counterweights to balance
 lighter rotors but sometimes things don't work like it would
appear at first)?

 Ken Powell-

Dave Atkins had a 1993 3rd gen and an RX8 rotor at OSH. The appear
to be the same weight.
Paul Lamar

   The apex seals are shorter due to the fact that the exhaust ports
would gas charge the back side of the seals and warp the springs.
   I have had the same thought that if you use them on 13b side
housing that you could turn higher rpm due to the lighter rotors and
the higher compression ratio and you could cut the apex seal groves
out deeper for the early ones better support.

   Ken

At this time I don't think they are lighter Ken.
Paul Lamar

Ken,
That is exactly what the local lads did - they cut the groove for the deeper
apex seals. I couldn't work out why, maybe your right.
George (down under)

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