The blower also assists in scavenging spent combustion gasses at the end of the power stroke. Boats equipped with two engines would typically use one Left Hand and one Right Hand, so that the torque from the propellers would cancel each other out, without the need for a complex reversing gear on one side.Īs a two-stroke diesel engine that does not use crankcase aspiration cannot naturally draw in combustion air, the blower is inherently necessary to charge the cylinders with air for combustion.
The less-common Left Hand engines were typically used in buses, because the rotation matched rear-engined transverse installations. A number of models could also run with the crankshaft turning either clockwise or counter-clockwise, called "Right Hand" or "Left Hand" rotation engines (as viewed from the front of the engine). Inline models were famously "symmetrical", meaning that blower, exhaust, water manifold, starter, and other components could be mounted on either side of the basic block to fit a particular application. This feature also assisted in keeping down the overall cost of these large engines by maintaining parts commonality with the smaller models.ĭetroit Diesel 8V-71T as used in the US M109 self-propelled howitzerīore and stroke are the same across all units, at 4 + 1⁄ 4 in × 5 in (108 mm × 127 mm). 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. Inline models included one, two, three, four and six cylinders, and the V-types six, eight, 12, 16 and 24 cylinders. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L).
#Detroit diesel fire commander ii series#
The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel.
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