How about an injector mounted just above the upper plug, or between the plugs. This could be a diesel injector with a very high pop pressure. Two single cylinder pumps would follow a single eccentric on the nose of the crank, 180 degrees apart. High rotor face temps would improve power. There would be no fuel trapped in the squish areas. You could run as much boost as you want. There would be no fuel to preignite or detonate because injection would be at TDC or just a few degrees before. Atomization would be near perfect and between the plugs. In fact once up to temps it might not need plugs at all. You could start it on gasoline and once at temp, run it on almost anything, just like WWII.
Something to think about anyway.
Lynn E. Hanover

Atomization is the big issue. That is what Vance is saying. It takes super
high pressure to atomize well. 2000 psi and up Ford claims.

Paul Lamar

Lynn is suggesting something that is very close to the "SCORE" technology (Curtiss-Wright/Deere/RPI direct injected stratified charge engines). The Wankel GMBH was also similar. Paul, you must have some references on this you can scan in....

The concept is very sensitive to injector location, iginter location, shape of rotor combustion recess, and injection characteristics (pressure, rate shape, spray pattern duration, etc.) Don't know if a Mazda engine would work acceptably well with reasonable modifications. Efficiency is very much improved with turbocharging, but combustion pressures get high (1200psi, about double what the Mazda engine would normally see). The pressure is considerably lower than true diesel at 3000psi plus.

Properly done, it WILL run on many fuels, hot or cold. Runs better on diesel than gasoline (gasoline burns too slowly). You can shut the ignition off at power, but its not because of combustion chamber temp or pressure, rather the spark plug stays so damn hot it works like a glow plug (at least in the true SCORE engine which has the spark plug in a little pre-chamber area).

Jon

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