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It doesn't necessarily have to be 2 stroke, could be configured as a 4 stroke.
I prefer 2 stroke as long as you understand there is no oil mixed with the fuel, and the incoming air has no fuel added until it is just outside the combustion chamber, or actually inside the combustion chamber.
This would depend on whether you are using very high pressure direct injection, or premixing the fuel and air in the single intake port with a heat exchanger from the exhaust port to preheat the mixture for HCCI operation, which should be much easier to accomplish with specific ranges of RPM and loads, with not WOT enrichment or idling necessary, and no manifold vacuum due to elimination of any throttle plate.
regards
Mech
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