The shape of Mercedes combustion recess is what Yanmar Diesel called an
'LDR', isn't it?
Some 12B Mazdas had this recess shape, along with double side seals.

An MDR recess vs an LDR or a Rotor having the recess close to the
trailing edge
modifies HC, CO, and BSFC, but this varies according to the individual type
of engine, choice was always after extensive experiments,
MDR rotors were probably chosen as a compromise
between BSFC and emissions under several rpm and load ranges.

Regards, + Salut

Jose Gros-Aymerich

  Madrid, Spain

There is no need to compromise BSFC as emissions can be eliminated by
the exhaust system.

Wankel diesels are dead ends as it is too difficult to get the
compression ratio high enough.

Paul Lamar

Hello Paul,

enclosed you can find 3 q+d (quick + dirty) "shots" ...

- the picture of the AVL RE
- a scetch of the rotor of the AVL engine
- a picture of the Daimler rotor as used in the 4 rotor 350 hp C 111

The red arrows shall show the direction of rotation ...

You can see, that there's a lot of space where the initial flame kernel
starts to grow. The rear wall of the recesses will generate some turbulence
- so you get a relatively fast burn of a big amount of the mixture in a
short time ...

The width of the recesses is also important - so the flame front can expand
to the side walls more easily ...

If I have a bit more time, I will send you some japanese patents of Mazda
with their ideas ...

With kindest regards

Franky / Frank Herfert

Way too much squish flow.
They would work well with a squish flow bypass under the combustion chamber.

Paul Lamar

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