Paul wrote:

With aluminum end housings the piston engine can't come close on power to weight ratio of the Mazda rotary either. I think Mazda aluminum end housings are inevitable sooner or later. The Diamond engine has them and it is putting out 115 HP while weighing under 160 pounds (as I recall) PSRU included.

Fred Osborn wrote:

Does anyone know what the inner surface of the Diamond aluminum end housings is made of or coated with?

They told us and I did not write it down. Mark Wrathal wrote it down I think. Mark?
It is flame sprayed something or other. Not Nicosil. The rotor housing is Nicosil.
It is quite thick as there is a slight recess machined in the end housing to accept
the coating. If it were me I would just put hardened and ground sheet steel in there.

Paul Lamar
 
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