BMW N74
| BMW N74 | |
|---|---|
| Overview | |
| Manufacturer | BMW |
| Production | 2008-present |
| Layout | |
| Configuration | 60° V12 |
| Chronology | |
| Predecessor | BMW N73 |
The BMW N74 is a twin-turbocharged V12 DOHC piston engine which replaced the N73 and has been produced from 2008 to present (as of March 2016).
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. [1]
The engine marked BMW's first use of an 8-speed automatic transmission (the ZF 8HP90).[2]
Models
| Engine | Displacement (bore x stroke) | Power, torque@rpm | Redline(rpm) | Compression (:1) | 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 | 7000 | 10 | 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 | 7000 | 10 | 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[3] [citation needed] | 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
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.[4]
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[citation needed]
- 2016 BMW M760Li xDrive 448 kW (601 hp)/ 800 N⋅m (590 lb⋅ft)
See also
References
External links
- 25 years of BMW 12-cylinder engines: setting new standards in the luxury class.
- The UnixNerd's BMW N74 engine page with photos, history and common problems.