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Piston spark ignition points?

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gipetto:
I wasn't suggesting that you use sleeve valves in the design, merely that you could rotate the cylinder, either in a reciprocating fashion, with the motion overlapping when the piston comes to top dead center and bottom dead center, or in a single direction of continuous rotation. in theory continuous rotation would be more efficient, but this has an increased complexity.

There are so many different ways to get increased efficiency from an engine. for example i don't know if you are familiar with the jowett jupiter r4. it is an early 4 cylinder boxer ohv that used offset cranks. the clever thing is one pair of cylinders balances the other pair so there's no vibration but quite a large increase in power, comparable to a weak turbo iirc.

If you wanted to you could scale your opposed piston engine up so that it's a two cylinder, then offset both cranks and have one pair of pistons accelerating while the other decelerates. this would only work if the pistons meet in the middle i think.

http://www.youtube.com/watch?v=hVJntOsL5zk

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