I interview Seiji Tashima, the engineering expert for Mazda's new
rotary, at Tokyo on your behalf.  Here are a few details he revealed:
rotor width reduced by 5mm  saves weight, improves apex seal performance
trochoid is 25mm wider, 35mm taller  for more displacement and torque
would not reveal increase in eccentricity. New displacement is 800cc/rotor.

Aluminum end plates have plasma-sprayed wear surface direct and indirect
fuel injection.

Torque gains come from longer e-dimension, more displacement, direct
injection.

Would not confirm 300 hp power goal.

All gas seals improved, smaller flame holes adjacent to spark plugs.

16x engine ran for the first time this year. full development will be at
least 2 more years.

Engine weight is reduced from 125kg [275 pounds] to 100 kg [220 pounds].

I hope you find this useful.

Don Sherman

We sure do Don, Thanks

Paul Lamar

Using these number we can make same calculations as follows:
25 mm wider means short axis from 180 to 205 mm
35 mm taller means long axis from 240 to 270 mm

This results in *E = 16.25* mm and in *R = 118.75* mm,
The ratio R/E = 7.308 up from 7.0

The *width* would be 85 by linear upscale, subtracting 5 mm we are back
down to *80* mm.
In fact 79.8 mm would be 800 cc, 80 mm width gives 2 cc more or 802 cc.
That is right on.

Regards
Rolf Pfeiffer

Thanks Rolf

Paul Lamar ...No rotor no motor.


Just a side comment:
Mazda is truly a unique company.  The automotive manufacturing business is
intensely competitive with frequent and brutal calls for cost-cutting
whenever the quarterly numbers take a dip.  Mazda has continued to dedicate
engineering talent and development dollars to the Wankel over many decades
despite these pressures. Sure, they've made some money on the RX-7 and RX-8
line, but they surely could have made just as much by spending this money on
marketing econoboxes.  They (rightly) believe that the Wankel has certain
inherent advantages, and are continuing to develop it.  We're all
beneficiaries.

Mark Waldron

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