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I don't have any pictures of it, but 42+ years ago Dad restored a Silent Alamo Generator (looked similar to a Delco Light Plant) that had a Sleeve Valve, but unlike the "Silent Knight" it had a ROATATING Sleeve (which was missing when Dad got it).Dad used to tell me about working on Willis Knight engines ,I know not stationary, but automobile, although there where a couple sleeve valve engines made for stationary work , cant remember the name of it at the time. After a little wear to cyl it would use more oil than gasoline, and look like a giant chainsaw engine chugging down the road. The sleeve wasn't stationary it moved up and down and was the valves . . . .
Owning a Garage/Repair-shop and having several local parts-houses nearby he sourced a suitable cylinder sleeve for a tractor (I never heard the make or model) and cut the gear teeth around the lower end of the sleeve to mesh with and drive off a gear on the crankshaft. Then he laid out the ports by rotating it through the motions and marking the timing locations on it, and bored them out to match the ports.
Made for a Nice Running Engine when done.
After Grandpa died in 1979 and Grandma put the farm up for sale, all of Dad & Grandpa's Tractors, Engines, and other Equipment got sold off at auction during our Threshing Show that year since he had no place to store everything with the farm being sold. I have No Idea where That Engine ended up going, but it was somewhat Unique, even if unassuming looking on the outside.