BMW N73
| BMW N73 engine | |
|---|---|
| Overview | |
| Manufacturer | BMW |
| Production | 2003-2008; |
| Combustion chamber | |
| Configuration | DOHC 60° V12 |
| Chronology | |
| Predecessor | BMW M73 |
| Successor | BMW N74 |
The BMW N73 is a V12 DOHC piston engine which replaced the M73 and was produced from 2003–2008.
Design
Compared with its M73 predecessor, the N73 features DOHC, also the N73 was the first production V12 engine to feature direct injection.[1]
The N73 was among the first BMW engines to use variable valve lift (called Valvetronic by BMW).
The camshafts featured infinitely variable vane-type VANOS (variable valve lift) for variable intake and exhaust valve timing; the VANOS units were designed as integral components of the chain drive and secured to their respective camshafts with a central bolt. For the N73 engine, the intake and exhaust camshafts had adjustment ranges of 63 degrees and 60 degrees, respectively, relative to the crankshaft.
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 had a Valvetronic assembly – including a motor, control module and position sensor – which consisted of a bridge support with eccentric shaft, intermediate levers with retaining springs, drag lever and the intake camshaft. [2]
The N73 was superseded by the BMW N74, a 6 litre twin-turbocharged V12 engine.
Models
| Engine | Displacement | Power | Torque | Redline | Year |
|---|---|---|---|---|---|
| N73B60 | 5,972 cc (364 cu in) | 327 kW (439 hp) @ 6000 | 600 N·m (440 lb·ft) @ 3950 | 6500 | 2003 |
| N73B67 | 6,749 cc (412 cu in) | 338 kW (453 hp) @ 5350 | 720 N·m (530 lb·ft) @ 3500 | 6500 | 2003 |
| Model | Years | Type/code | Power@rpm, Torque@rpm |
|---|---|---|---|
| Rolls-Royce Phantom (2003) | 2003- | 6,749 cc (411.8 cu in) V12 (N73B68) | 460 PS (338 kW; 454 hp)@5350, 720 N·m (531 lb·ft)@3500 |
| Phantom Extended Wheelbase | 2005- | 6,749 cc (411.8 cu in) V12 (N73B68) | 460 PS (338 kW; 454 hp)@5350, 720 N·m (531 lb·ft)@3500 |
| Rolls-Royce Phantom Drophead Coupé | 2007- | 6,749 cc (411.8 cu in) V12 (N73B68) | 460 PS (338 kW; 454 hp)@5350, 720 N·m (531 lb·ft)@3500 |
| Rolls-Royce Phantom Coupé | 2008- | 6,749 cc (411.8 cu in) V12 (N73B68) | 460 PS (338 kW; 454 hp)@5350, 720 N·m (531 lb·ft)@3500 |
N73B60
Applications:
- 2003-2008 E65/E66 760i/760Li
- 2003-present Rolls-Royce Phantom
See also
References
External links
- The UnixNerd's BMW N73 engine page with photos, history and common problems.
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| 4-cylinder petrol | << M10 | M40 | M43 | N40 / N42 | N43 / N45 / N46 >> | ||||||||||||||||||||||||||||||||||||
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| N54 | N55 >> | ||||||||||||||||||||||||||||||||||||||||
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| M102 | M106 | ||||||||||||||||||||||||||||||||||||||||
| 8-cylinder petrol | M60 | M62 | N62 | N63 >> | |||||||||||||||||||||||||||||||||||||
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| S65 >> | |||||||||||||||||||||||||||||||||||||||||
| 10-cylinder petrol | S85 | ||||||||||||||||||||||||||||||||||||||||
| 12-cylinder petrol | M70 | M73 | N73 | N74 >> | |||||||||||||||||||||||||||||||||||||
| S70 | |||||||||||||||||||||||||||||||||||||||||