BMW N73
| BMW N73 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | BMW |
| Production | 2003 - 2016 |
| Layout | |
| Configuration | DOHC 60° V12 |
| Chronology | |
| Predecessor | BMW M73 |
| Successor | BMW N74 |
The BMW N73 is a V12 DOHC petrol engine which replaced the M73 and was produced from 2003–2016. It was used in the BMW 7 Series and Rolls-Royce Phantom.
The N73 was the world's first production V12 engine to use direct injection.[1]
Compared with its M73 predecessor, the N73 also has DOHC, variable valve timing (called double-VANOS by BMW) and variable valve lift (called Valvetronic by BMW).[2][3]
Design
The variable valve timing (VANOS) is a continuously variable design and is present on both the intake and exhaust camshafts. The VANOS units were designed as integral components of the chain drive, and the adjustment ranges are 63 degrees for the intake camshaft and 60 degrees for the exhaust camshaft.[4] The redline for the N73 is 6500 rpm.
The N73 engine also featured BMW’s ‘Valvetronic’ system, which varied intake valve opening lift between 0.3 mm and 9.85 mm, according to engine speed and load. Each cylinder head has a Valvetronic assembly – including a motor, control module and position sensor.[4]
The N73 was superseded by the N74, a 6 litre twin-turbocharged V12 engine.
Models
| Engine | Year | Displacement | Power | Torque | CR |
|---|---|---|---|---|---|
| N73B60 | 2003-2008 | 5,972 cc (364 cu in) | 327 kW (439 bhp) @ 6000 rpm |
600 N⋅m (443 lb⋅ft) @ 3950 rpm |
11.3 |
| N73B68 | 2003-2016 | 6,749 cc (412 cu in) | 338 kW (453 bhp) @ 5350 rpm |
720 N⋅m (531 lb⋅ft) @ 3500 rpm |
11.0 |
N73B60
The 6.0 litre version has a bore of 89.0 mm (3.5 in) and a stroke of 80.0 mm (3.1 in).[5]
Application:
- 2003-2008 E65/E66 760i/760Li
N73B68
The 6.75 litre version has a bore of 92.0 mm (3.6 in) and a stroke of 84.6 mm (3.3 in).
Application:
- 2003-2016 Rolls-Royce Phantom[6]
See also
References
- ^ "BMW World- 12-Cylinder Enginges". www.usautoparts.net. Archived from the original on 27 June 2013.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ "BMW 760Li 2002 - Detroit Auto Show". www.caranddriver.com. Retrieved 7 August 2017.
- ^ "2002 BMW 316ti - Review and road test". www.automobilemag.com. Retrieved 7 August 2017.
- ^ a b "BMW N73 engine". www.australiancar.reviews. Retrieved 7 August 2017.
- ^ "BMW N73 and N74 V12 Engines". www.unixnerd.demon.co.uk. Retrieved 8 August 2017.
- ^ "RealOEM.com - Online BMW Parts Catalog". www.realoem.com. Retrieved 30 November 2017.