Richard Sohn wrote:

Another possible variety of a compound end housing would be in using an original housing and machining off the outer wall and unnecessary material. Than replacing the outer wall with aluminum.
The major advantage of this solution is the comparatively low technical risk at the expense of some more weight. The water jackets cross section is reduced for one-rotor configuration, with the oil filter mount removed. A remote oil filter is more of a desirable solution in a small cowling anyway. The dowel pin location is untouched. Remaining thickness of the cast iron is .8".
The only two items to be considered in machining the aluminum are the main bearing oil drain and the intake.
I started milling an old end housing on my CC-mill for checking the feasibility. I have not found anything so far telling me it would not make sense.
My estimated weight savings is 12 lb on the flywheel side housing.

(CC-mill = Cheap Chinese-mil)

Richard.

 
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