Dean Head wrote:

Paul,
I am finding the Barry mount discussion most helpful to visualize how it
comes together. Looking at your annotated Barry/Cup drawing I have a couple
of questions. I attached an edited copy marked up. Is the member that
receives the bolt a length of tube closed at one end with a 4130 disk? 

Yes. 

 If
so, the walls look quite thick. How thick? 

At least 3/16" thick. If you plan to machine it on a lathe by 
boring  bar stock it make it 1/4 inch thick. 
Adds a tiny bit of weight but it is a high stress area.

Also, do you know the tubing
diameters and wall thickness used for the individual members in Perry's
mount? 

What say you Perry?

Another variant is that I am told that my engine is the "industrial"
version of the 13B. It has two large mounting pads cast into the front
cover. See attached picture. I am considering an aluminum horizontal member
with two Barry mounts attached similar to your PRSU plate to support the
forward end of the engine using these mounting bosses to provide attachment.
These two combined with the PRSU plate mounts should work nicely. Thoughts?
Thanks,

Dean

That is just an early model front cover. Probably from a 12A.
First gen RX7s used that as the main motor mount.

Yes that sounds fine for that end of the engine as the loads are low
if the main rubber bushings are at or near the CG of the engine/psru/
prop combination.

Great picture of Richard Sohn's 2 cycle oil adapter to the metering pump.

Paul Lamar
 
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