Paul,



I have seen a lot of discussions and comments regarding an all aluminum
engine. As seen below the statement is that there will be a “major
development effort” too solve this problem. We are proud of our
accomplishment here in solving this problem. We have an all aluminum
engine that experiences less than a .001 step wear at 100s of hours use,
and ready for testing to 1000s of hours. In fact we have seen more step
wear in cast iron type housings than our aluminum. Another example is
our inspection of a 653 HR run on a small development engine we provided
a company for testing, no step wear and no coatings on the side
housings. As you know the early OMC snowmobile engines also had no
coatings and all aluminum side housings. I have several all aluminum
side housing engines that are successful in our collection here. The
same scenario applies to the discussions about cast iron seals. We have
great success with these as well.



We applaud Mistrals efforts, they are working on a very different
engine platform and market than we are.



Statement from the forum below:



As to an all aluminum engine, I am afraid it is not anytime soon. Al
side-housings just don't last it is confirmed by the experience of two
companies which have tried.  It will be a major development effort to
solve this problem.



Fly safe,

Francois



Eric Barger, President

Phone 419-694-3000 x 222

RotaMax Inc.

15152 Twp Rd 190

Arlington, OH 45814

Fax 419-694-1401

www.rotamax.net <http://www.rotamax.net>


I am glad you are getting good results with that Eric.
The OMC engines had a high silicon content aluminum similar
to that used by GM in the Vega. It was then etched to bring
out the silicon wear surface. Some European engine builders
are using the same idea for cylinder walls.

Paul Lamar

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