It has been a frustrating 7 month, trying to get the single rotor
dynamically balanced. After a lot of fellows on the lists trying to
help, I called Mazdatrix, and as of last week I got the parts back from
them balanced. The engine is going back together right now for
continuing testing.
The main effort is now designing and testing the [p-port] intake and establishing
a performance baseline.


I made some changes on the outside of the engine. For example the lower
engine mount points are now on the front of the engine to provide
mounting areas for radiator and oil cooler. The location is much like
with a Shertz Beam on the two rotor.
The third mounting point is on the oil pump cover at a location similar
to the 12A front mount in the car. I don't have pictures yet, but the
castings should be here any time now.
I am also working on getting a magneto ignition in.

The e-shaft in the picture was taken before hardening and grinding. The
cooling oil jet location is clearly visible in the original location.

I hope to be able to do shorter update intervals in the future.

Richard Sohn
N2071U

Paul,
To answer some of your questions of Richard's design, his e-shaft is made by
removing the rear eccentric lobe ( most remove the front). This modified
section is not like the Mazda rear end, in that it is made to suites the
Hirth gearbox. I would suggest that the composite housings may be wider than
standard which has allowed Richard to retain an area which houses the front
lobe oiling jet. With standard housings there wouldn't be sufficient room
for this approach, but it is a good idea. The other options with standard
housings are an oiling jet very close to the eccentric lobe - there is just
enough room OR drilling through the rotor internally and having the bearing
oil hole feed the rotor cooling.
I do have a drawing on the single rotor eccentric shaft if you need to
confirm this visually.
George (down under)


I would be interesting in seeing how you are doing it.