Hi,

Can you please explain the problem and solution of balancing when
using  a cut down e-shaft  with single rotor 1/2 Mazda 13b engine.

Regards Zahid


Balance is controlled by these equations. The Wankel is not just
statically balanced but dynamically balanced as well.

In a single rotor engine the counterbalance weights must provide a
STATIC balance for the e-shaft eccentric and its rotor and must also
account for the DYNAMIC wobble caused because the static counter
weights are not located at the mechanical centres of the rotor and
the eccentric. It is impossible to do this.

They must be mathematically sized relative to their lateral position
from the rotor and eccentric centre line.

Paul Lamar


The Tracy ISO is physically attached to the flywheel. Does that need
to be brought in to balance equation  as extra mass to mF (front
counter weight) or mR (mass Rear Counterweight)?

Regards Zahid

The rear counter weight is hiding behind the ISO.

Paul Lamar

Here is how I solved some of the balancing issues. There are a whole
lot of issues interacting when building a new engine configuration.
Weight control influences almost everything. A single rotor engine
certainly requires a considerable flywheel, if one wants the idle
speed somewhere below 3000 RPM. I integrated  the rear balance
weight in the flywheel (picture). The front balance weight I modified
with tungsten inserts before dynamic balancing. I ended up with a
clean rotating setup. My engine is based on 12A rotor and housing, so
I do not have any direct comparison to 13B size parts. FWIW.


Richard Sohn N2071U

http://www.fairpoint.net/~res12/home.html



Hi Richard, I have read some postings where some have machined a single
rotor eccentric shaft from a 2 rotor unit. Paul
mentions the shaft needs to be hardened after machining. Could you give a
overview of the process you used to build your
shaft ?

Thanks, Steve Carlisle



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