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a spinning disc with a hole/holes in it spun by an electric motor. it does away with the bad reliability of the solonoids,but would require some major cylinder head mods and probably be hard to scyn up since it would have no mecanical connection to the crankshaft, thus the opening and closing event timing advantage,but im sure a new host of challanges, i dont know much about the wankle but probably the same type of valve except spinning instead of sliding.
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