Don Dunbar wrote:

Hello ACRE,
As I started all this I should finish it. Vance you are right it is
silica sand used in the molds in most Aluminium sand casting. Paul you
are right if the surface is ground back it generally gets rid of it for
welding. In some cases the silica can run deep if the pour has been
too hot. The tensile of sand casting is not that good but this can be
improved through heat hardening in an oven. This was the reason that I
decided to stay with the Mazda pressure cast bell housing as its
tensile is much greater than sand casting.

--
Best regards,
 Don                            mailto:ddunbar@echidna.id.au

Not to mention it is a heck of a lot lighter weight due to the
capability of high pressure die casting thin wall sections with steel
male and female molds. Also it is not sand cast so silica infusion
would not be a problem in welding it.

Paul Lamar

Your right again Paul!!

If there's enough interest in the bellhousing I would ask for interested
parties to get involved in an injection mould process. The cost would be
beyond me, on my own - I believe Butch might be interested, if we could
canvass sufficient interest.

Given the cost of machining (we would save on) we would get our investment
back after 100 units and supply very cost effectively to customers/
builders.
Would you be interested Don!?
George

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.