Peter Nunn wrote:

paul,
This was the idea I toyed with.  It was to replace the end housings with cnc
machined housings that are split down the middle.  This allows for an
arbitrarily complex cooling fins inside as well as good alignment.  The only
problem in volume manufacture was wasteage, but for low production runs of a
specialized engine it was not a problem.  The CNC people I have been working
with see no problems as the 3D cad package I am using can generate DXF and
they can then generate the machining program from that.  I decided not to on
my first try and just to the accessory back-end.  If someone is interested
in trying to make a set of PP housings that are cnc machined as well as the
end and middle plates, I can do the drawings/renderings.

regards

You mean like this old ACRE NL message? :-)

Subject:        Makeing your own alloy end & center housings.
   Date:        Thu, 25 Feb 1999 01:38:56 -0800
  From:        Paul <rotaryeng@earthlink.net>
    To:        z <rotaryeng@earthlink.net>

Wrathall Mark wrote:

The Powersport rotary appears to have aluminum housings.

What sort of weight saving is this worth? How complicated would it be to
cast the end and center housings for a peripheral ported rotary?. The
casting would only require accurate cores for the water jacket (and oil
passages - or could this be simply drilled), as the rest would have to
be milled and bored anyway. Has anyone every tried an assembled housing?
Mill the water jacket and oil galleries into a slab of alunimium, then
bolt a closeout plate on the side, finally bore and mill the two seal
surfaces?

An early prototype did. The later ones were all cast iron.

Roughly 15-20 pounds apeice. The stock end and center housings
run around 35 pounds each.

The rear and center aluminum housings can be obtained 
from Racing Beat.

The gif is my suggestion for makeing your own.

I have some picts of cutaway end housings if you would like
to see what the inside looks like. You will need to copy
the passages as the water flow direction is critical.
I would suggest getting some late model housings and mill
them down to make exact copies.
 
Paul Lamar
 
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