Paul,
In your opinion, which is the better install, 20b or a 13b?

I'm building a 3500 gvw Murphy moose.  Eventually I'll put it on floats.
I'm looking for about 300 to 350 hp.  I am brand new to rotaries but
in the last few weeks I have tried to absorb info from many
different web sites.

Here is what I think I know.

The 13b would need to be far more modified; ported, turbocharged.
It would have more available parts for a rebuild.

The 20b, stock is at 280 hp.  The apex seals are taller? And may not
be as good as some aftermarket 13b seals? 20b has more torque given
the same hp as a 13b.  I've also read about aftermarket 3 rotor
renisis builds with non Mazda e-shafts (homemade).

There are so many different variables, I was hoping to get advice to
gain knowledge to eliminate some choices. Up to now I was
vacillating between an io-540 and a m-14.

Thanks, Paul lennemann.

The apex seals are interchangeable.

For that application a 20B would be much better. You can not have
too much power for a heavily loaded float plane. Ken Welter
effectively uses NOS to get his 3000 pound Coot on the step and out
of the water in less than 10 seconds with a 2 rotor.

I would use a 375 HP P-port 20B and use NOS for a few seconds to get
it on the step and out of the water. That should give you around 450
to 500 HP. Won't hurt the engine. Ken has burned hundreds of pounds
of NOS so far. Don't waste your time with a side port engine.

Paul Lamar



How about retaining the stock turbos or using an aftermarket unit for turbo
normaize? You could use the turbo for take-off and then at altitude.

Dale Davies
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