I think I found the Mercedes dwg  Bill is talking about. The trouble is the depression is on the wrong
end of the rotor. Probably done to maximize torque hence HP. It is an attempt to
put the center of pressure ahead of the eccentric. At least I think.

Paul Lamar

Paul, my impression of the MB depression is to produce a reliable flame front without using 3 spark plugs to keep the charge lit at the trailing portion of the rotor. If the trailing 20℅ of the rotor is flat across the chamber you are going to extinguish the burn in that area as the rotor nears the waist of the trochoid. And be wasting fuel that could continue to produce power regardless of where the eccentric is positioned.

The trailing part of the depression is shallow to keep the compression up. I would be surprised if they hadn't tried many flavors of the depression to arrive at that one. The main portion of the pocket also seems to be in a good place to provide power from the leading plugs ignition.

Bill Jepson

The squish flow problem in the Mercedes arrangement is much much worse.
The pressure generated between the trailing part of the rotor and the housing
would be even greater than all the others tried. Or the compression ratio
would be compromised.


Paul Lamar

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