I found an old SAE paper 730119 on the OMC engine.
A very interesting paper.
I noticed that OMC had good luck with aluminum
side housings made from hypereutectic aluminum.
The same process used by GM on the Vega engine.
Does anybody have any direct experience with
OMC snow mobile rotary engine side housing wear problems?
I wonder how Silicon Nitride ceramic
side seals would work on hypereutectic aluminum.
Perhaps OMC was better able to control the casting
process than GM.
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http://www.rheinmetall.org/index.php?lang=2&fid=1499
Cayenne engine block delivered "ready-for-engine-assembly"
Added value through ATAG project
A growing trend is evident: whereas automakers are reducing
the depth of production, automotive suppliers are doing
just the opposite. The recent cooperation between Dr. Ing.
h.c.F. Porsche AG (Stuttgart) and KS Aluminium-Technologie
AG (ATAG) underlines exactly this.
The Neckarsulm-based automotive supplier has broken new
technological ground with the new eight-cylinder engine
block for the Porsche Cayenne versions S and Turbo. For the
first time, the completed "Alusil" hypereutectic aluminum
silicon alloy engine blocks (manufactured in a low-pressure
die casting process) delivered to Porsche are
"ready-for-engine assembly". "The obvious advantage for the
customer is that Porsche does not have to carry out any
finishing jobs. Indeed, the completed engine block leaves
our factory for final assembly by Porsche in their
Stuttgart-Zuffenhausen plant", says Dr.-Ing. Oliver Vogt,
product line manager Porsche and department head
responsible for complete processing.
As mentioned, the engine blocks for the Cayenne are
manufactured from the special alloy Alusil. This material
has one decisive advantage over conventional aluminum
alloys: it provides the necessary wear-resistance on the
cylinder bore surfaces ? for monolithic engine blocks like
for the Cayenne 4.5 l V8 engine. In other words, additional
cylinder liners or coatings are not needed.
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Paul Lamar ...No rotor no motor.
I had first hand experience with the rotary snowmobile in the 70"s. It was
an evinrude "Bobcat" I believe. As I recall it had 35 whopping HP. It ran
forever, I don't know about the housings as I never tore it down. All I can
say is that we had the machine for over 10 years and it never failed to
start no matter how long you let it sit. I remember that it sat for over 2
years and it wouldn't start by pulling on the rope start (battery was dead).
We tried for about 15 min, my Dad finally said that it wasn't turning fast
enough. Sure enough we jumped it with a car battery and it fired right up.
Looking back on it the seals were probably stuck. The Bobcat was a "Back-up"
machine. We have owned over 15 different machines over my 35 years up here
and we owned that Evinrude the longest. All I can say about those engines is
that they were "Bullet proof". We gave it to a friend of my Dad's who had
just moved up here and didn't have a Snowmobile. We all thought that it
sounded funny when it ran. I wish I still had it. :)
Rick in Alaska
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