Paul,
1 - Is there a book or books that I can acquire that treats the
mathematical development of the shapes of the housing and rotor
specifically for Wankels ? - I'm thinking of programming my CNC
milling equipment and rather than measure an existing engine would
like to approach it from a mathematical point of view rather than
physical measurements -
2 - In particular, are there any specific fundamental equations
available for the SACHS lawnmower, OMC snowmobile, and Mazda engines
- I would like to be able to predict mathematically generated CNC
paths and compare them to measurements of actual parts if possible
3 - The aluminum of the OMC housing and other parts appears to be
fairly soft, possibly the standard 356 casting alloy - I plan to use
6061-T6 as David Mikesell has mentioned - The OMC housing appears to
have some sort of coating on the running surface that is much harder
- Mentioned was Niksal (correct spelling ?) - Would like to know a
source or sources for getting that done -
4 - Will probably machine and grind new eccentric shafts - Glad now
that I saved all of my precision machine tools when I closed my small
tool & die shop - Anxious to again be making metal shavings -
4 - Mention was made of new seals for the Mazda engines - Any sources
for new seals for the OMC snowmobile engines ? - Too bad I didn't
pursue this when OMC was located here in Galesburg, Illinois - I did
some contract work for them and knew the CEO personally but he has
passed away now and the factory where the castings were made is long
gone - I should try to locate some of the engineers and manufacturing
people who worked on the project and try to pick their brains -
5 - Does anyone on this list have information on expected life of the
OMC engines if they are properly cared for and lubricated ? - The
ones I have look like they led fairly rough lives - I have located
three complete running snowmobiles in upper Minnesota. I will be
going to see them run and perhaps buy them - Expected lifetimes would
be helpful to know how long they might last -
Sorry for the load of questions all at one time -
Roland Friestad
Have you looked at the web site?
http://www.rotaryeng.net/books10.html
Book Reviews Rev. 11
WANKEL TYPE ROTARY ENGINES
The definitive book on the rotary is simply called "ROTARY ENGINE"
by Kenichi Yamamoto published by Toyo Kogyo Co. Ltd. (Mazda) in
1969. This is a highly technical book chronicling the development of
the wankel by Mazda. Kenichi is an engineer and has risen to CEO of
Mazda.
This book on the rotary is also called "ROTARY ENGINE"
by Kenichi Yamamoto published by Sankaido Co. Ltd.
Second edition published in 1981. This is an updated version of
the first "ROTARY ENGINE" book. Confusing eh what? This book
has a much greater emphasis on emissions.
Another technical book on the Wankel rotary engine is; "The Wankel
RC Engine Design and Performance" by R.F.Ansdale Published by A.S.
Barnes & Company Lib of Cong 69-18692
The Wankel engine Design Development Application by Jan P. Norbye.
Chilton Book Company. ISBN 0-8019-5591-2 Published in 1971. A little
history and results of the Wankel engine development by NSU,
Mercedes, Mazda and others and some results of work by
Curtiss-Wright. Also some history on all rotary engines. Not as
technical as I would like but not bad.
These books will be easier to find then the Toyo Kogyo book.
You can download the Yamamoto books from
http://www.rotaryeng.net/interesting.html
and then
http://foxed.ca/index.php?page=rx7manual
Paul Lamar
Roland,
The generation of the trochoide shape is not that complicated, machining
and finishing for a smooth surface however is a bit more so.
The machines that NSU used at the time were copying machines where the
shape was picked up from a master shape by a roller of same diameter as
the finishing tool.
If you like you may contact me directly for some more talk on that.
FWIW, Paul should give you my e-mail address.
Rolf Pfeiffer
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