This looks like a variation on the theme of the Knight rotating valve engine of the early 1900's. The Stearn's automobile company (maybe others) used them. During WWII, England's Bristol aircraft engine company made huge, rotating-valve radials used in the Beaufighter, Stirling and Halifax. It appears the new Cummins is an overhead valve engine, using the rotating sleeve as a friction reducing measure. The sleeves on the old engines turned back and forth to alternatley expose the intake and exhaust ports situated in the side of the cylinder. These engines were plagued with high oil consumption. There is a side-port model airplane engine using a gear-driven sleeve that spins similar to the Cummins design.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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