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
Hi Paul!: thanks for your interest: expired patents, and also
those still in force,
as you know, are of open and free download in Espacenet , if patent
is still in force,
you need paying for industrial use of it, just by entering the
patent number, you can access it
all, if you want to overcome entering wrong numbers and not being
able to locate the
patent, knowing the title and the name of inventor helps, I
retrieved some of the
patents I attached by entering in espacenet, advanced search, the
Key word Rotary
Engine, and 'Ford' as applicant, not long ago, somebody offered for
sale in ebay.com
a CD-ROM with USA patents related to rotary engine, cost was affordable.
I'm not aware of the surface coating Mazda uses, but I had the
feeling that it's the Nickasil
described in the Citroen and Mercedes-Daimler patents, but the name
Rotary Engine
is not always shown in the title of patents for surface coatings.
The president of AEHS,
www.enginehistory.org -Kimble D McCutcheon,
maintains a site on technical literature about engines:
www.weakforcepress.com just the name is highly attractive.
Hope this is useful, best regards. Salut †
Jose Gros-Aymerich
Madrid, Spain
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