[elhigh]

I had an idea for a two-stroke engine that was two-strokes IC, then two strokes steam. It was inspired by the Crower process, but the idea was to use a half-speed cam like a four-stroke, which would operate two sets of valves, first set for the combustion process, the second set to exhaust steam after the steam expansion cycle.

Another idea is to have the conrod rigidly attached to the cylinder and project through a solid bottom in the cylinder, and the top be IC and the bottom is steam. That may be difficult to lube though - how did they do it with the old steam engines?