Paul, I have not been their in a long time, so glad you enlightened
me about the changes in the Sun'N'Fun. What a shame, is their any
aspect of our nation uninfected by liberal decay? I so wanted to see
the Allison PSRU with the promise of 4 Rotor builds.

Speaking of the 4 Rotor, since as I read here that the 4 Rotor Engine
is so rare, has anyone done a build using two 2 Rotor engines with
appropriate mods to make a functional 4 Rotor from Mazda engines?

George Curtis

I have never heard of it. Plenty of people build four rotors. They
use mostly stock 2 rotor parts and fashion a new four rotor e-shaft.
It is not rocket science. There is a guy on the Drift circuit using a
4 rotor. As I recall there are a couple of Oz (Australian) outfits
that sell four rotor e-shafts.

IO have been thinking about one made from separate eccentric parts
and a simple center shaft.  This would greatly cut the cost IF it
worked.

One of the best ideas I ever heard about making E-shafts is hydro
forming. That is where a hollow steel tube is put in a mold and
tremendous pressure is applied to form the lobes.  I suspect the the
tube is heated to high temperature first. I think a lot of steel car
and truck tubular frames are made that way. Stuff is made in minutes
not counting the heating time.

Paul Lamar

Yes, conjoined-ish 13B's has been done.
https://youtu.be/A2nuYyMIVao

And Granny's Speed shop sorta did it as well..
http://grannys.tripod.com/4rotor.html

Enjoy!

Dan Gorsline.


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