History
BMW N73 V12 Engine
From 2003 to 2008
The BMW N73 is a V12 DOHC piston engine which replaced the M73 and was produced from 2003–2008.
Compared with its M73 predecessor, the N73 features DOHC, also the N73 was the first production V12 engine to feature direct injection. with a cylinder bank angle of 60 °. The N73 has direct injection , four-valve technology and fully variable valve control , the BMW " Valvetronic is called." This reduces the fuel consumption of the engine by up to 10% (BMW data).
The crankcase , like its predecessor, consists of an aluminum - silicon alloy ("Alusil"), the crankshaft with 12 counterweights made of forged steel. Aluminum castings were used for the cylinder heads.
The B60 variant runs on two MED 9.2.1 engine control units
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 timing) 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.
The N73 was superseded by the BMW N74, a 6 litre twin-turbocharged V12 engine.
Models
| Engine | Year | Displacement (bore x stroke) | Power, Torque@rpm | Redline (rpm) | Compression (:1) |
|---|---|---|---|---|---|
| N73B60 | 2003-2008 | 5,972 cc (364 cu in) (89 mm × 80 mm (3.50 in × 3.15 in)) | 445 PS (327 kW; 439 hp)@6000, 600 N·m (443 lb·ft)@3950 | 6500 | 11.3 |
| N73B67 | 2003- | 6,749 cc (412 cu in) (92 mm × 84.6 mm (3.62 in × 3.33 in)) | 460 PS (338 kW; 454 hp)@5350, 720 N·m (531 lb·ft)@3500 | 6500 | 11 |
N73B60
2003-2008 BMW 7-Series engine Specs 760Li
| Engine Size | 5972cc |
|---|---|
| Cylinders | 12 |
| Valves | 48 |
| Fuel Type | Petrol |
| Power | 438 bhp |
|---|---|
| Top Speed | 155 mph |
| 0-60 mph | 5.4 secs |
| Torque | 600 Nm, 443 ft-lb |
| CO2 Emissions | 327 g/km |
| Euro Emissions Standard | 4 |
| Miles Per Tank | 387 miles |
Application:
- 2003-2008 E65/E66 760i/760Li
N73B67/8
Rolls-Royce Phantom engine specs
| Engine Size | 6749cc |
|---|---|
| Cylinders | 12 |
| Valves | 48 |
| Fuel Type | Petrol |
| Power | 453 bhp |
|---|---|
| Top Speed | 149 mph |
| 0-60 mph | 5.7 secs |
| Torque | 720 Nm, 531 ft-lb |
| CO2 Emissions | 385 g/km |
| Euro Emissions Standard | 5 |
| Miles Per Tank | 374 miles |
Application:
- 2003-present Rolls-Royce Phantom
- since 2003 in the Rolls-Royce Phantom (RR01)
- since 2007 in the Rolls-Royce Phantom Drophead Coupe (RR2)
- since 2008 in the Rolls-Royce Phantom Coupe (RR3)
Technical
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