Tim Talmage wrote:

I ordered the SAE paper on the 4 rotor  Lemans engine. In the section on side
housings there was no mention of the housings
being aluminum. Your description of the paper states that
they are. Do you know this to be the case?

Paul, and Tim, The discussion of the coatings used for the 4 rotor side 
housings lists them as aluminum. It's on the disk you
circulated Paul.  Tim there would be no need to coat the 
iron or steel side housings as nitriding works fine for them,
Bill Jepson

 
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