I spoke with somebody from Japan  about the 16B at Seven Stock.
He said it is very close to being announced.
The 16B will have a 100 mm wide rotor instead of 80 mm and will be
about 3.2 L displacement. It won't have too much more power
in side port configuration than the RX8 engine because the
area of the side ports will be about the same as the RX8 engine.

However it will have a lot more low RPM torque which is
just what the RX8 needs most. In theory, with a lower axle
ratio and hence a lower freeway cruise RPM, it will get
better MPG in the RX8. Also the combustion chamber is a somewhat
better shape being closer to a square rather than a longer
rectangle.

A p-port version however will be something to behold.
My guess is somewhere around 375 HP at 9000 RPM NA all other
things being equal. Probably a bit more as the area of
a 2.5 inch dia. intake runner is about 50% greater than a
2 inch runner. The rotor housing width will be about 3.9 inches
so a 2.5 inch dia. intake runner should be no problem.

The bare engine weight will only be a little bit
more than the 13B. The rotors, I estimate, will weigh about
11.5 pounds rather than 9 pounds. The e-shaft will be about
4 pounds heavier. And the rotor housing about one pound
heavier each. I am guessing here. Bare engine weight
will be about 200 pounds rather than 190 pounds.
Assuming of course Mazda does not do aluminum end
housings which they need to do as soon as possible IMHO.
A lighter engine cuts the overall weight of the car
because there is less mass to handle in a crash, less braking
parts weight stopping the car and less structure to handle
the weight of the engine.

With aluminum end housings, 50 pound lighter engine, P-ports
and installed in a 2500 pound Miata the power to weight ratio
will be about 6.7 to one which exceeds the power to weight ratio of
the 400 HP Corvette at 7.5:1 and a lot of Porches and Ferrari's
costing less than $250,000.

The power to weight ratio of the engine with PSRU will approach
1.5 to one which no aircraft piston engine can come close to.

The length of the engine will increase a little less than
2 inches.

Paul Lamar ...No rotor no motor.

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