Detroit Diesel Series 71

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Series 71
Detroit Diesel 6V71
Overview
Manufacturer	Detroit Diesel
Production	1938–1995
Layout
Configuration	Multi-cylinder, inline and V-type
Displacement	71 cu in (1.2 L) (per cylinder)
Cylinder bore	4+1⁄4 in (108 mm)
Piston stroke	5 in (127 mm)
Cylinder block material	Cast iron[1]
Valvetrain	Pushrod-operated 2 or 4 valves per cyl.
Valvetrain drive system	Gears
Compression ratio	18.7:1 (N/A) 17.0:1 (Turbo)
Combustion
Turbocharger	On some versions
Fuel system	Unit fuel injection
Fuel type	Diesel
Cooling system	Water-cooled
Output
Power output	10–1,600 hp (7–1,193 kW)
Torque output	299–2,150 lb⋅ft (405–2,915 N⋅m)
Dimensions
Length	36–79 in (910–2,010 mm)
Width	29–47 in (740–1,190 mm)
Height	39–59 in (990–1,500 mm)
Dry weight	1,525–4,820 lb (692–2,186 kg)
Chronology
Successor	Series 92 Series 60

The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L).

Inline models included one, two, three, four and six cylinders, and the V-types 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 reducing the overall cost of these large engines by maintaining parts commonality with the smaller models.