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heDetroit Diesel Series 71is atwo-strokediesel engineseries, available in bothinlineandVconfigurations, with the inline models including one, two, three, four and six cylinders, and the V-types including six, eight, 12, 16 and 24 cylinders. The two largest V units used multiple cylinder heads per bank to keep the head size and weight to manageable proportions, the V-16 using four heads from the four-cylinder inline model and the V-24 using four heads from the inline six-cylinder model. This feature also assisted in keeping down the overall cost of these large engines by maintaining parts commonality with the smaller models.
The inline six-cylinder 71 series engine was introduced as the initial flagship product of theDetroit Diesel Engine DivisionofGeneral Motorsin 1938.Superchargingwas offered beginning that year, also.[1]The V-type first appeared in 1957. The 71 in the model series designation refers to thedisplacement per cylinderin cubic inches (actually 70.93cuin / 1, 162.4cc). Bore and stroke is the same to all units, at 4.25 x 5.0 inches (107.95 x 127mm). Inline models were famously symmetrical , meaning that blower, exhaust, water manifold, starter, etc. could be mounted on either side of the basic block to fit a particular application. A number of models could also run either clock-wise or counter clock-wise, called Right Hand or Left Hand engines. The less common Left Hand engines were typically used in buses and boats.
All Series 71 engines useuniflow scavenging, where agear-drivenRoots type blowermounted to the exterior of the engine provides intake air through cored passages in the engine block and ports in the cylinder walls at slightly greater than atmospheric pressure. The engine exhausts through pushrod-operatedpoppet valvesin the cylinder head(s), with either two or four valves per cylinder.Unit injectionis employed, oneinjectorper cylinder, with no high fuel pressure outside of the injector body. The injectors are cycled from the samecamshaftresponsible for opening the exhaust valves
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