BMW N45 explained

BMW N45 engine
Production:2004-2011
Configuration:Inline-4
Head:Aluminium
Block:Aluminium
Valvetrain:DOHC, with VVT
Fueltype:Petrol
Displacement:1596cc
1997cc
Bore:842NaN2
852NaN2
Stroke:722NaN2
882NaN2
Predecessor:BMW N40
Successor:BMW N43

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 some countries, where vehicle taxes favoured small-displacement engines.

The N45 is based on the N46, however it does not have balance shafts or Valvetronic (variable valve lift).[2] As per the N42 and N46, the N45 has double-VANOS (variable valve timing). 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
15961NaN1 850NaN0
at 6,000 rpm
1500NaN0
at 4,300 rpm
2004-2011
19971NaN1 1300NaN0
at 7,000 rpm
2100NaN0
at 4,250 rpm
2006

N45B16

Applications:

N45B20S

The N45 was enlarged to 19971NaN1, 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. Instead, the engine used dual overhead camshafts and 16 valves. The main visual difference is the carbon fiber valve cover.

Applications:

See also

Notes and References

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