BMW N45

The BMW N45 is a naturally aspirated four-cylinder petrol engine which replaced the BMW N40 and was produced from 2004-2011.[1] It was produced alongside the BMW N46 engine and only sold in several countries, where vehicle taxes favoured small-displacement engines.

BMW N45 engine
Overview
Production2004-2011
Layout
ConfigurationInline-4
Displacement1.6–2.0 L (98–122 cu in)
Block materialAluminium
Head materialAluminium
ValvetrainDOHC, with VVT & VVL
Combustion
Fuel typePetrol
Chronology
PredecessorBMW N40
SuccessorBMW N43

The N45 is based on the N46, however it does not have Valvetronic (variable valve lift).[2] As per the N42 and N46, the N45 has double-VANOS (variable valve timing).[1] In 2007, the N45 was updated, which was called the N45N.

In 2007, the N45's successor - the BMW N43 - was introduced. However, the direct-injected N43 was not sold in countries with high-sulfur fuel, so the N45 continued to be produced alongside the N43. The N45 was phased out as new generation vehicles were released with the turbocharged BMW N13 four-cylinder engine.

Models
EngineDisplacementPowerTorqueYears
N45B161,596 cc (97.4 cu in)85 kW (114 bhp)
at 6,000 rpm		150 N⋅m (111 lb⋅ft)
at 4,300 rpm		2004-2011
N45B20S1,997 cc (121.9 cu in)130 kW (174 bhp)
at 7,000 rpm		210 N⋅m (155 lb⋅ft)
at 4,250 rpm		2006

N45B16

Applications:

  • 2004–2011 E81/E87 116i
  • 2006–2011 E90/E91 316i

N45B20S

The N45 was enlarged to 1,997 cc (121.9 cu in), to homologate the E90 320si for the World Touring Car Championship.[3] The N45 was chosen over the N46, because its lack of variable valve lift allows higher engine speeds.

Applications:

  • 2006 E90 320si (Limited production model)

See also

References
  1. "Engine specifications for N45 engines". www.bmwheaven.com. Retrieved 3 June 2012.
  2. "BMW 116i now powered by 2.0L N46 Valvetronic". www.paultan.org. Retrieved 3 June 2012.
  3. "BMW 320si – A real driver's car". www.bmwblog.com. Retrieved 14 April 2017.
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