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Wow, that Esso-Cross engine is pretty much exactly what I was trying to design. Well, except for how it uses a radial arrangement of pistons. And the fact that it uses rotary valves. But the eccentric spinny bits in the middle are spot on. I’m sad to hear they got less than half the predicted horsepower and then gave up. I wonder if it was down to too much friction? Was “Esso-Dross” a pun or a typo? I’m trying to get my head around that Stiller-Smith engine.