Series 71

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The Detroit Diesel Series 71 is a two-stroke cycle diesel engine series, available in both inline and V configurations, with the inline types ranging from one to six cylinders and the V types ranging from six to 24 cylinders. It was introduced as the initial flagship product of the Detroit Diesel Engine Division of General Motors in the division's 1938 founding.

All versions were supercharged. This was required because a naturally aspirated 2 stroke diesel cannot draw enough air in on its own. Later high-performance versions added turbochargers to supplement the supercharger.

The most popular incarnations of the Series 71 diesel as used for highway vehicle applications included the inline 6-71 and the V-block 8V-71 (the latter of which was introduced for sale in 1958). Both incarnations had found their way in many popular applications including trucks, heavy-duty buses, motor homes, construction and industrial equipment, and military applications.

The inline 6-71 engine, in all of its variations, was also available as a 'pancake engine' for horizontal (underfloor) mount applications, such as on larger Crown and Gillig school buses and articulated puller transit buses (such as the Ikarus 286).

1 Features
2 Popular Horsepower Ratings (6-71)
3 Popular Horsepower Ratings (8V-71)
4 Competing power plants
5 See also

[edit] Features

71 cubic inches (1.2 liters) per cylinder.
1.2L (1-71/Single cylinder) 2.3L (2-71/I-2), 3.5L (3-71/I-3), 4.7L (4-71/I-4), 7.0L (6-71/I-6 and 6V-71/V-6), 9.3L (8V-71/V-8), 14.0L (12V-71/V-12), 18.6L (16V-71/V-16) and 24.1L (24V-71/V-24)
Power ratings ranging from 15 to 1100 HP
6-71 (inline; turbocharged variation) supported the DDEC I, II and III.

[edit] Popular Horsepower Ratings (6-71)

650 ft•lbf @ 1400 rpm 238 hp governed at 2100 rpm (supercharged)
801 ft•lbf @ 1400 rpm 275 hp governed at 2100 rpm (supercharged & turbocharged)
810 ft•lbf @ 1200 rpm 290 hp governed at 2100 rpm (supercharged & turbocharged/aftercooled)

[edit] Popular Horsepower Ratings (8V-71)

866 ft•lbf @ 1400 rpm 318 hp governed at 2100 rpm (supercharged)
990 ft•lbf @ 1400 rpm 350 hp governed at 2100 rpm (supercharged & turbocharged)
1064 ft•lbf @ 1200 rpm 345-370 hp governed at 1800-2100 rpm (supercharged & turbocharged/aftercooled)