Also known as the RENESIS(2), made its first (and so far only)appearance
in the Mazda Taika concept car. And is most likely to be the same engine
in the new revision of the Mazda RX-8 car, which currently features the
13B-MSP.

The Mazda press release regarding the engine:

    Next Generation RENESIS (Rotary Engine 16X) In developing the
    next-generation RENESIS, Mazda made a thoroughgoing revision of
    engine dimensions including the trochoid rotor housing, adopting a
    longer stroke and larger displacement of 1600cc (800cc x 2) aimed to
    raise thermal efficiency and boost torque at all engine speeds. By
    employing the Hydrogen RE design policy of a direct injection system
    and aluminum side housing, as well as various other measures, we are
    further promoting the rotary engine?s merits of light weight and
    compact size.

    Marc J

    NexusMustang

Taking a stab at it, the chamber volume increases to 800 cc from 654 cc.
Cube root of (800/654) is 1.069 as a linear multiplier.

E would go from 15 to 16 mm, R from 105 to 112 and the width of 80 to 86
or so.
That is, if the ratio R/e stays at 7.0, and also the ratio of width to 'e'.
Who knows, the ratios may be changed to make it a more "long stroke"
engine.
The RX7/8's have a stroke to equivalent piston diameter of 0.33. F1
engines about 0.4.

Will be interesting to see what the actual numbers come out to be.

Regards
Rolf

One of my sources assured me the rotor width is the same. Apparently they
were concerned with e-shaft bending. What do you estimate the numbers are with the same rotor width.

Paul Lamar

If 80 mm remains as the width, it could be like this:
1.  E = 16,   R = 120,  R/e = 7.5,  equiv. S/D = .330
2.  E = 16.3,  R = 118,  R/e = 7.234,  equiv. S/D = .339
3.  E = 16.6,  R = 116,  R/e = 6.988,  equiv. S/D = .348
4.  E = 17,   R = 113,  R/e = 6.647,  equiv. S/D = .361

Who knows, they might lower the R/e for a higher S/D.

Rolf


One needs this chart to go along with the other.