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 ,
The first attachment is the essence of the Patent showing the ratio of
length to breadth and how it slows flame speed after collision.
This is why Mazda changed "bore to stroke" ratio in the 16X. (our
"rectangular bore" is 22 sq in and our stroke is only .625")
The second attachment shows how Mazda addressed this problem with the
13B by moving the leading plug down a few millimeters but this just
presented a new problem. Notice the that the most critical water passage
in the engine is made smaller!
Compare this to the same water passages on the 26B LeMans
engine.(attachment 3)
On the last attachment, the I find most difficult for people to
comprehend, notice the small crooks in the burn rates when the collision
of flame fronts occur.
Barry Bordes
I am not disagreeing with any of that.
........................SO WHAT?
THEY DID NOT TRY TWO SPARK PLUGS SIDE BY SIDE !!!!!
Far far cheaper to do that to the current engine instead of buying a new
2 billion dollar factory to build 16B's.
Paul Lamar
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