I've always been keen on Smokey's work, and was glad to see the list of resources, but the 1st one I hit on started with him saying that the vapour engine project was nearly moribund; the remaining interest seemed to be from outside, not inside. He was one of the best at pushing the envelope, but never got all the way to market with the available materials.
I think that the best recent news is Fiat's Multiair system for Variable Valve Timing, which can keep an engine efficient over a wide range of outputs.
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