12

Paul,  Am I correct in assuming that if you buy alloy end plates the
 center cast plate remains?  THis center plate is surely the simplest
 to make, or is it that it is light enough as a casting?

Neil Unger.

Well if you mean cast aluminum that would be great but as cast iron
it is still heavy.

As cast iron it weighs 27 pounds.

If machined it is not a very thick chunk of aluminum plate. It is
about 2 inches thick.

Paul Lamar


Paul, correct, it is still heavy at cast iron, but Promaz seem to
only make the end plates, not the center plate.  Does anyone make
machined alloy center plates that you know of?

Neil Unger.

Racing Beat in the US.

Paul Lamar


Has there been any research  into the tbo of ally plates? It is a
different thing to have on a  drag racing engine that runs for much
shorter time than one for aircraft use, id imagine. I gather racing
beat units have been around the longest?

Richie Barrow

I suspect if you chrome plate them like the rotor housings and use Silicon Nitride side
seals they should  last as long as the Silicon Nitride apex seals. Namely 20,000 hours.

The Austro Engines Wankel has no TBO.

I don't know the details of the material used or the design.

Crankshaft cracking in an aircraft piston engine is a big factor in TBO.
Most of the exhaust valves have already been replaced at least once.
I know my C182 crank was a mass of cracks at 1500 hours. I am surprised
it did not kill.

Paul Lamar


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