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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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