BMW N20

The BMW N20 is a turbocharged four-cylinder petrol engine which replaced the N53 (or BMW N52 in some markets) and was produced from 2011-2017. Although the N20 is a four-cylinder engine, it is considered a replacement for the naturally aspirated six-cylinder N52/N53 because it powers equivalent models, producing similar horsepower to the N52/N53 with greater low-rpm torque and better efficiency.[1]

BMW N20 engine
Overview
Production2011-2017
Layout
ConfigurationInline-4
Displacement1.6–2.0 L (98–122 cu in)
Block materialAluminium
Head materialAluminium
ValvetrainDOHC, with VVT & VVL
Combustion
TurbochargerSingle twin-scroll
Fuel typeGasoline
Chronology
PredecessorBMW N52, BMW N53
SuccessorBMW B48

The N20 features a twin-scroll turbocharger, double-VANOS (variable valve timing), Valvetronic (variable valve lift), direct injection, automatic stop-start[2] and an electric water pump. The N20 was sold alongside the smaller displacement BMW N13 turbocharged four-cylinder engine. The N20 was placed in Wards Top 10 Engines in 2012.[3]

In 2014, the N20 began to be replaced by its successor, the BMW B48.

Class action lawsuit alleging timing chain guide failures

It has been well documented in online forums, including www.bimmerpost.com, that thousands of early production N20 engines were manufactured with faulty internal plastic timing chain guides. Evidence indicates that defective polycarbonate compositions were utilized in the manufacturing process for the timing chain guide, and as a result over a very short period of time the rigid plastic guides would break down and deteriorate in the engine with little or no warning. Upon failure of these internal plastic components, the timing chain slackens (becomes loose) and "skips time" by jumping teeth on upper cam shaft sprocket, a phenomenon that causes catastrophic damage to the engine by un-synchronizing the cam shafts and valve train.

In 2017, a class action lawsuit[4] was filed by several owners against BMW seeking redress for the faulty units. Plaintiffs in the BMW engine defect class action seek to represent a nationwide Class of consumers affected by timing chain guide and secondary chain failure and wear as well as several subclasses for states such as New Jersey, Illinois, Florida, Utah, New York, Colorado, Texas, Alabama, Oklahoma, Massachusetts, California, Wisconsin, Oregon and North Carolina. In 2018 BMW attempted to dismiss the class action lawsuit.[5] In 2019 U.S. District Judge William H. Walls partially granted and partially denied BMW’s motion to dismiss claims that it sold vehicles with a known engine defect. Walls also ruled that the automaker cannot escape the suit entirely.[5]

Models
EngineDisplacementPowerTorqueRedlineYear
N20B161,592 cc (97.1 cu in)125 kW (168 bhp)
at 5,000 rpm		250 N⋅m (184 lb⋅ft)
at 1,500-4,700 rpm		7,0002013–2016
N20B201,997 cc (121.9 cu in)115 kW (154 bhp)
at 5,000 rpm		240 N⋅m (177 lb⋅ft)
at 1,250-4,500 rpm		7,0002013–2017
135 kW (181 bhp)
at 5,000 rpm		270 N⋅m (199 lb⋅ft)
at 1,250-4,500 rpm		7,0002011–2017
160 kW (215 bhp)
at 5,500 rpm		310 N⋅m (229 lb⋅ft)
at 1,350-4,800 rpm		7,0002012–2017
180 kW (241 bhp)
at 5,000 rpm		350 N⋅m (258 lb⋅ft)
at 1,250-4,800 rpm		7,0002011–2017

N20B16

Applications:

125 kW version

  • 2013–2016 F10 520i (Turkey only)[6]

N20B20

Applications:[7]

115 kW version

  • 2013-2016 E89 Z4 sDrive18i
  • 2013-2017 F25 X3 sDrive18i

135 kW version

  • 2011–2015 E84 X1 xDrive/sDrive20i
  • 2011–2017 F25 X3 xDrive20i
  • 2012–2015 F30 320i
  • 2013–2016 F34 320i GT
  • 2011–2016 F10 520i
  • 2013-2016 F10 520Li
  • 2011–2016 E89 Z4 sDrive20i
  • 2014–2016 F22 220i
  • 2015-2017 Brilliance Huasong 7 MPV[8]

160 kW version

  • 2012–2017 F20 125i
  • 2013–2016 F10 525Li
  • 2015-2017 Brilliance Huasong 7 MPV [8]

170 kW version

  • 2014–2017 F45 225i Active Tourer

180 kW version

  • 2011–2016 E89 Z4 sDrive28i[9]
  • 2011–2015 E84 X1 xDrive/sDrive28i[10]
  • 2012–2017 F25 X3 xDrive28i
  • 2011–2016 F30 328i
  • 2014-2016 F32 428i
  • 2012–2016 F10 528i
  • 2013–2016 F34 328i GT
  • 2014–2016 F22 228i
  • 2014–2017 F26 X4 xDrive20i
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See also

References
  1. "N20 series engines – BMW goes for less, delivers more". www.cbt.com.my. Archived from the original on 26 October 2013.
  2. "BMW N20 and N26 Four Cylinder Turbocharged Engines". www.unixnerd.demon.co.uk. Retrieved 30 April 2017.
  3. "BMW's Innovative 4-Cyl. Blazes New Path for Smaller Engines". www.wardsauto.com. Retrieved 3 June 2012.
  4. "BMW Class Action Seeks Fix for Engine Chain Defect". Top Class Actions. 2017-11-17. Retrieved 2019-05-29.
  5. "BMW Engine Defect Class Action Moves Forward With Warranty Claims". Top Class Actions. 2018-11-02. Retrieved 2019-05-29.
  6. "BMW 5 Serisi Sedan: Teknik Veriler". www.bmw.com.tr (in Turkish). Archived from the original on 25 October 2013.
  7. "BMW 3 Series Sedan". www.bmw.com.au. Archived from the original on 23 September 2015. Retrieved 3 June 2012.
  8. "Brilliance Huasong 7 MPV". www.chinaautoweb. Retrieved 8 March 2015.
  9. "BMW 4-Cylinder Engines Return to US in 2011 in the Z4 sDrive28i". www.bmwgroup.com. Retrieved 14 May 2012.
  10. "BMW X1 sDrive28i - Features & Specs". www.bmwusa.com. Retrieved 16 August 2013.
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