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 20032008.

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The N73 was superseded by the BMW N74, a 6 litre twin-turbocharged V12 engine.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

EngineDisplacementPowerTorqueRedlineYear
N73B605,972 cc (364 cu in)327 kW (439 hp) @ 6000600 N·m (440 lb·ft) @ 395065002003
N73B676,749 cc (412 cu in)338 kW (453 hp) @ 5350720 N·m (530 lb·ft) @ 350065002003
Rolls-Royce Motor Cars
ModelYearsType/codePower@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 Wheelbase2005-6,749 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 Coupé2007-6,749 cc (411.8 cu in) V12 (N73B68) 460 PS (338 kW; 454 hp)@5350, 720 N·m (531 lb·ft)@3500
Rolls-Royce Phantom Coupé2008-6,749 cc (411.8 cu in) V12 (N73B68) 460 PS (338 kW; 454 hp)@5350, 720 N·m (531 lb·ft)@3500

N73B60

Applications:

See also

References

External links

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