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


Mazda went to the narrower rotor for 16X design to get the fuel burn to the rotor sides with single plugs. Dual would help also especially in aircraft. The leading/trailing is not really dual plug as certification would go. You might be able to baffle the powers that be with BS.
Dale Davies


It will run on either one. Your can diddle with the plugs until you are blue in
the face.

Someone needs to focus on heat loss.

A good start would be a stainless steel rotor. SS conducts heat much less than cast
iron.


Paul Lamar

Paul,

What type of Stainless Steel works best for the Rotor as replacement of iron?

http://www.stainlesssales.com/stainless-steel-grades.html

Anyone making SS rotors?

George F. Curtis Jr.


http://www.stainless-steel-world.net/pdf/11022.pdf

"In North America, the common designations for cast stainless steel and
nickel-base alloys are descriptive of their chemistry and purpose. This
designation system was established by the Alloy Casting Institute (ACI) and
has been adopted by ASTM."

"A designation beginning with the letter "C" indicates that the alloy is used
primarily for corrosive service; if the first letter is "H", the alloy is
used primarily for high temperature service at or above 1200°F (649°C).  The
second letter indicates the approximate nickel and chromium contents of the
alloy grade on the FeCrNi ternary diagram (ASTM A 781, Appendix X1 and
Figure X1.1).  For C classifications, the single or double digit number
following the first two letters indicates the maximum carbon content of the
grade (% x 100).  For H classifications, this number is the midpoint of the
carbon content range in units of 0.01 % with a ±0.05% limit.  Other alloying
elements, if present, are represented by one or more letters following the
number.  For example, the designation CF8M indicates that the grade is
corrosion resistant (C), contains between 17% and 21 % chromium and be tween
8% and 12% nickel (F), a maximum carbon content of 0.08% (8), and molybdenum
(M); HD indicates that the grade is heat resistant (H), and contains between
26% and 30% chromium and between 4% and 7% nickel (D)."

You would have to contact this company to get a specific number for the alloy used
as it would change a few percentage points each way..

See the attached chart for thermal conductivity.

Iron is 60 and SS is 19. Very noticeable when you use SS for shielding.

Centrifugal Casting is ideal and that is the way Mazda is doing for the
RX8.

Paul Lamar


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