All Detroit diesel 2 strokes used pressurized air to blow the exhaust out of the top of the cylinder through regular exhaust valves (2or 4 of them, no intakes at all) the pressure is produces by a supercharger. stuck to the side of the engine, blowing into a plenum surrounding the middle of the cylinder wall. Each cylinder has perimeter ports in a ring. These are located just above the point of lowest travel of the piston. Fuel is injected and ignites with max pressure just after TDC. Piston moves down expanding the heated combustion gasses. Crankshaft drives the blower, pressurizing the air in the plenum. As the piston clears the ports, the exhaust valves are opened (cam operation). The compressed air purges the exhaust out of the cylinder and fills it with air. Compression happens heating the air for the next injection cycle. The crank case is closed and operates just like a 4 stroke. Jim
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Today's Featured Article - Talk of the Town: Repairin a Gas Tank - by Staff. This interesting discussion is from the Tool Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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