Is it feasible to cast in an actual bolt hole for the motor mount at

this

stage?

Chris C.
microcosman.com/aircraft

I don't think so Chris. Probably require a core for
each of eight holes. Not practical.

Why would you want them?

Paul Lamar

Paul,
I think Chris is talking about the rubber damper (engine mount)  flange and
holes being integral to the housing.
Interesting suggestion - I have been thinking about that but haven't come to
any final conclusion!!

The problem is that the mounting block would need to be tapered for the
foundry process, that makes it more difficult to mate the rubber to it and
would be only supported by one side - it may not be strong enough!

I think having them separate and bolted together is still the best
alternative.
George( down under)

I agree there is no way to insure the necessary strength with out cores. 
Cores and core boxes add greatly to the cost of the castings.

You also have to accommodate different motor mount widths. A turbo installation
means wider motor mounts. Actually wider motor mounts are desirable for everything
with the possible exception of the RV3 RV4 and Long EZ.

You could offer bolt on castings. A wide set and a narrow set.

Paul Lamar
 
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