Subject: Apex Seals
From: Rotary Engine
Date: 4/6/2007, 11:23 AM
To: AARotary Engine

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

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