History
BMW N74 V12 Engine
From 2008 Onwards
The BMW N74 is a twin-turbocharged V12 DOHC piston engine which replaced the N73 and has been produced from 2008 to present .
The cylinder bank angle is 60 °. Engine block in closed deck construction, oil sump and piston are made of aluminum.
The N74 has a direct-injection petrol engine, two turbochargers (Garett GT2260S), which were developed specifically for this engine and are mounted below the cylinder banks on the outside of the engine, four-valve technology and a variable valve timing with the brand name Valvetronic. The injection nozzles are single-hole twist nozzles, the injection pressure is up to 12 MPa. The unit uses a conventional three-way catalytic converter and is suitable for operation with low-grade, sulfur-containing gasoline.
The first version N74B60 met the EU 5 emission standard, from 2013 also the EU6, the N74B66TÜ meets the emission standard EU6 .The oil is supplied by a volume-controlled 6-chamber pendulum slide pump.
Design
Compared with its N73 naturally-aspirated predecessor, the N74 features twin-turbochargers. The N74 engine has double overhead camshafts per cylinder with variable intake and exhaust valve timing, BMW’s double VANOS. Both the intake and exhaust VANOS or variable valve timing units have 50 degree crank angle adjustment. The N74 has four valves per cylinder and is not fitted with BMW’s ‘Valvetronic’ or variable valve lift intake system.
The engine marked BMW's first use of an 8-speed automatic transmission (the ZF 8HP90).
Models
| Engine | Displacement (bore x stroke) | Power, torque@rpm | Year |
|---|---|---|---|
| N74B60 | 5,972 cc (364 cu in) (89 mm × 80 mm (3.50 in × 3.15 in)) | 544 PS (400 kW; 537 hp)@5250, 750 N·m (553 lb·ft)@1500–5000 | 2009– |
| N74B66 | 6,592 cc (402 cu in) (89 mm × 88.3 mm (3.50 in × 3.48 in)) | 570 PS (419 kW; 562 hp)@5250, 780 N·m (575 lb·ft)@1500–5000 | 2009– |
| 570 PS (419 kW; 562 hp)@5250, 820 N·m (605 lb·ft)@1500 | 2016– | ||
| 632 PS (465 kW; 623 hp)@5600, 800 N·m (590 lb·ft)@1500–5500 | 2013– | ||
| N74B66TU | 6,592 cc (402 cu in) (89 mm × 88.3 mm (3.50 in × 3.48 in)) | 610 PS (449 kW; 602 hp)@5500, max. 800 N·m (590 lb·ft)@1500 778 N·m (574 lb·ft)@5500 |
2016– |
N74B60
BMW 7 series 2008–2015 F01, F02, F03 760i/760Li specification
| Engine Size | 5972cc |
|---|---|
| Cylinders | 12 |
| Valves | 48 |
| Fuel Type | Petrol |
| Power | 536 bhp |
|---|---|
| Top Speed | 155 mph |
| 0-60 mph | 4.5 secs |
| Torque | 750 Nm, 553 ft-lb |
| CO2 Emissions | 314 g/km |
| Euro Emissions Standard | 6 |
| Miles Per Tank | 369 miles |
Applications:
- 2008–2015 F01, F02, F03 760i/760Li
N74B66
An enlarged version of the N74B60, displacing 6.6 litres and boasting in excess of 563 bhp (420 kW) features in the Rolls-Royce Ghost.
Rolls-Royce Ghost specification.
| Engine Size | 6592cc |
|---|---|
| Cylinders | 12 |
| Valves | 48 |
| Fuel Type | Petrol |
| Power | 563 bhp |
|---|---|
| Top Speed | 155 mph |
| 0-60 mph | 4.8 secs |
| Torque | 780 Nm, 575 ft-lb |
| CO2 Emissions | 329 g/km |
| Euro Emissions Standard | 5 |
| Miles Per Tank | 360 miles |
Applications:
- 2010–present Rolls-Royce Ghost 563-hp / 575-lb ft
- 2014–present Rolls-Royce Ghost V-Specification 593-hp / 575-lb ft
- 2014–present Rolls-Royce Wraith, 624-hp / 590-lb ft
- 2015–present Rolls-Royce Dawn 563-hp / 605-lb ft
N74B66TU
- 2016 BMW M760Li xDrive 448 kW (601 hp)/ 800 N·m (590 lb·ft)
Technical
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