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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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