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

There is a bloke in OZ who is well down the track of of having an insert to
replace the chrome liner should it be damaged.  He is still fiddling with
the prototype but the repair will be relatively cheap. So do throw out any
seeming totalled rotor housings yet.

Neil.

Should be able to use an NC mill to grind out most of the old rotor housing
steel liner and sweat solder in a new one.

Either that or tig weld up any deep scratches and regrind the rotor housing
and then re-chrome.

Sounds expensive what ever is done.

Paul Lamar

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