Paul, Do you know the thickness of the chrome plating on the steel
liner of the 13B housings?

Jim Brewer

All I know about it is in this Mazda SAE paper.

http://www.rotaryeng.net/material-tech.pdf

Paul Lamar

      Hi!: I'd say only porous chrome plating would fit the inner housing surface,
   if the surface is 100% flat under the microscope, oil film won't attach to it,
   and lubrication won't exist, some irregularity is needed, you can find some
   about this in the attached patents, and also in SAE papers 741043; 741047;
    920931, and 2008-01-1050.
     The book by T Suzuki: 'The romance of engines' published by SAE, addresses
   this issue, among some very interesting others.
    NSU and Citroen Wankel RCEs used Nickasil for the working surface coating,
   it's used today by several motorcycle and car engine producers
     Hope this helps. Salut †
             Jose Gros-Aymerich
              Madrid, Spain

Jose did a patent search and sent me a bunch of patents on this subject.

http://www.pat2pdf.org/

Thanks Jose. I have attached the Ford done in 1976. Too much to publish
them all.

Since Mazda  has sold 2.5 million rotary engines it is best to stick with what works :)

Paul Lamar

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