To get the  16X displacement and they also narrowed the rotor width.
 They are doing that after finding out the flame
 propagation does not get  all the way to the
 sides when the width is over 75mm. The 13B is 80mm.

 To increase  displacement from 1146cc (12A) which was 75mm wide
 rotors, to about 1600cc the eccentricity and
 radius need to be  increased. E of 17.5mm
 and radius of 122.5mm which is up from 15 mm and
 105mm. E17.5,R 122.5, W 70 gives 1560cc. E 18,
 R 126, W 70 gives 1660cc.
 Either would  increase torque and help the combustion efficiency.

      Dale  Davies


    They did not try side by side plugs. Austro
 engines has a wide  rotor with    plugs side by side.

      Paul Lamar

 If you pushed the rotor  width to 80mm and dual s x s plugs with your
 coils would give 3.6 to 3.8 liter displacement  with gobs of torque.
For  autos run lower  RIM for a bit better fuel economy.

   Dale Davies

   You mean wider than 80 MM right?
   The current displacement is 2,6 liters.

   For 3.9 it would be 120 mm  wide.

   Paul Lamar

 The side-by-side plugs are  probably done for redundancy.
 Mazda's  16X  paper describes the best width and length ratios  and
 their  effect on flame speed.
 When the flame front touches the side walls or
 the adjacent spark plug's  flame front  it slows down.
The 12A has the proper ratio.  The 13 B does not.  As Dale Davies just
 pointed out the 16 X would return to the proper ratio.

Barry Bordes

 Do you have a scanned copy of that paper?

 Paul Lamar


Paul, it is from a Patent 2009 0101103 0A1
attached in a word doc.

Barry Bordes

Thanks for the patent Barry. Too big to publish just yet. I'll convert it
to a pdf and see if I can make it smaller.

No mention of side by side plugs nor are there any illustrations of side by side by
side plugs in the patent.

The text runs on to pages and pages. It is an attempt to over whelm
the patent office with bull shit :-)

Super Tech in Germany has built some engines with narrower rotors.
I am surprised Mazda was granted a patent on it.

Here is a view of the Austro wide rotor.
Note the cooling fins inside the rotor. Will work real well with the oil
squirter.  Here too is a picture of the Kantana powered with a 2 rotor.
Most of these picture were taken at the factory by Mark Wrathal
and myself.

Paul Lamar

The Rotary Engine free News Letter. Powered by Linux. If you want off
the list PLEASE let me know and I will remove  you.  ACRE NL web
site. http://www.rotaryeng.net You Tube http://tinyurl.com/beqqxas
Copyright 1998-2016 All world wide rights reserved.