High load I can understand...
But high rpm isn't that efficient because of the frictional and pumping losses...
What ever happened to the Orbital engine?!
Turbo charged, direct injected 2 stroke. Clean, small, REALLY Powerful...
And less frictional losses (4 strokes have 3 strokes that have to be "pushed" by the other cylinders. Or large heavy flywheel.
2 stroke, we'll everytime the piston goes down is a powerstroke!
It was all the buzz years ago...and a lot of the major manufacturers were experimenting with the concept.
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