I think the rubber is in there to damp the vibration. Hard to fathom
 I know but I suspect that tiny little C shaped corner seal is resonating
 like a tuning fork. That is why it shatters. It will be interesting
 to see what Mazda does on the RX8.

The corner seal drives the side seal along. Notice how the corner seal gets
the wear marks where the side seal eats into it. I start the clearance off at
zero or a bit less. Just loose enough for the corner seals and side seals to
move freely as a set in the grooves. They wear in very quickly and develop
measurable end clearance. I don't think they sing at a higher frequency than
just the RPM, but surely they flex a bit. So I use the solids to stay out of
trouble.
Lynn E. Hanover

Ah so! Good point Lynn. That precludes using anything soft like teflon. Thanks.
That certainly sounds like something to do for aircraft engines.
Yes folks this is good advice so use the solids instead of the
drilled out versions. Forget the rubber inserts.

It is like the situation with apex seals. The latest three piece apex seal
designs are not the best for aircraft use. Particularly with turbo's.

Paul Lamar
 
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