What are the differences between the 20b intermediate housings and the 13B intermediate housing? Could the 13B housings be modified or if you were making an e-shaft from scratch, could it be made to accomodate the use of 13B intermediate housings to make a 3 rotor engine?
Brian Trubee
Redmond, WA

It is wider and there is a special main bearing.

There is a rumor that someone in Australia has done that. I would
copy the Mazda 20B exactly however and make a 20B style intermediate housing.
I don't think there is enough room in there for a proper coupling and main bearing
unless you copy the 20B intermediate housing.

Here is a picture of a three rotor shaft.

Paul Lamar

While you are at it you might as well make a four rotor engine.
Here is a drawing to copy.

Paul Lamar
 
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