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About 15-20 years ago I saw a TV-documentary about an australian company named Orbital Engine that was said to be close to mass production of a 3-cyl two-stroker with better fuel economy and lower exhaust emissions than a four-stroke of same date! These engines had a delayed direct injection of fuel similar to that in the above described marine V6. It also had lubrication in a closed circuit like in a 4-stroke. Cylinder scavenge was done by a separate pump/compressor instead of crankcase/pistons.
From what I know this is not very different from many two-stroke diesels except that they often have exhaust valves and a camshaft. Once adding a camshaft and some valves to a two-stroker I see no reason not to make it a four-stroker instead. Well... Perhaps the 2-T design can deliver more even and higher torque and power at lower speed compared to a 4-stroke of the same displacement. (firing twice as often)
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