Hello Paul,

what I've found about the Fichtel & Sachs RE ...
  Apex Seals are made of IKA3 from Goetze in Germany (now part of
Federal-Mogul)

     special gray cast iron ("Grauguss") with C 3,6%, Si 2,8%, Mn 0,8%
     HRC 40

 Trochoid was layered with Nicasil (= Elnisil, Galnical ...)
     NiSiC
     HRC 54

 Side Housings were cast of "uebereutektischem AlSi"
     I try to explain it: ~ material contents more Si then needed for
homogeneous mixture + the Si accumulates at the surface as wear surface (or
something like that ...)

The Toyota SAE paper I talked about is the No 790435 (at
http://papers.sae.org/) - but I don't have it + it's about Light Load only


At last perhaps useful or interesting ...
a big paper by Mathieu Picard at MIT  ~ 60 MB, 357 pages, PDF file
"Development of Multiscale Models for the Performance of the Gas + Oil Seals
in Rotary Engines"

Too big to send it, but you can find it with the help of Bing or Google or


For better results you can add   filetype:pdf   to your search string ...

This document is about Mazda Renesis oil seals + apex seals + side seals -
still not perfect ...


With kindest regards

Frank (Herfert)


That is great, thanks for the information and the links

David Mikesell




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