Paul wrote:

None of them, to my knowledge, have been successful
in reducing the BSFC below .47. The major problem with high
pressure fuel injection is the cost of the equipment. A second
problem is getting a good mixture inside the combustion chamber.
The air and fuel does not mix well all that rapidly. A third
problem is the flat shallow shape of the combustion chamber
does not lend itself to direct fuel injection... air assisted
or otherwise. I suspect the fuel tends to condense on the face
of the rotor before it can be ignited.

Presumably the rotor face is at least as warm as the oil.  The oil runs
fairly toasty (180 degF - 210 degF). I don't know why BSFC hasn't
improved, but I doubt that the fuel is condensing onto the rotor face.

Russell Kent

Well I used the word condensing but it may just be quenching
the fuel burn. The big problem is low power for the car industry
and the rotor may be much cooler at 20% power.

BTW the engine at high RPM is naturally stratified charge with
the rich mixture out near the plugs.

Paul Lamar

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