Detroit Diesel Series 71
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).
| 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 |
| Valvetrain | Pushrod-operated 2 or 4 valves per cyl. |
| 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 |
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.