For those of you that have never seen a Mazda rotor it is a monumental
work of art. This is just a crude approximation.

It must have taken Mazda engineers many many hours to design
the required core boxes and patterns.  Back in the old days
they did not have 3D programs like Rhino and Solid Works to help them.
It was all done on pencil and paper using 3 view drawings. The pattern
makers had a huge challenge.

The foundry had a very complex job casting them as well.

This is just for designing end housing basically.

These are sand casting and only recently did they got
go to centrifugal sand casting.

Paul Lamar

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