The sensor info is helpful because I'm presently identifying the
   ones on
       my 20B also.

       I recently heard someone say that if you are building a P-Ported
   rotary,
       you need to switch to carbon apex seals.  The caveat, as they
   described
       it, is that excessive turbo boost could shatter the carbon apex
   seals,
       but if you are running normally aspirated definitely use carbon.  I
       don't understand this.  Why would this be necessary?

       Don

       It is not necessary to use carbon apex seals with a p-port.
       The vast majority of rotary engines (over two million) have p-port
       exhaust. All apex seals used so far have no trouble. If anything the
       peripheral exhaust port is harder on the apex seal than the
   peripheral
       intake port.

       Paul Lamar

   Thanks Paul, that's the way I was looking at it too, but being a Newbie,
   I just listened and nodded.  I guess I was right to doubt the info.  It
   sure is nice to have an experienced source to bounce this stuff off !!
   Thanks again!!
   Don


The problem of ceramic seals is that they are relatively more brittle
(like soft iron, and hardened steel) but stronger. Turbo added pressure
in the camber that can lead to slight detonation, which could chatter
the ceramic seal, while normal grey cast iron seals are more "flexible"
Roderick Scotto



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