BMW B38

The BMW B38 is a turbocharged straight-three petrol engine, which replaced the straight-four BMW N13 and has been in production since 2013. It is part of a modular BMW engine family of straight-three (B38), straight-four (B48) and straight-six (B58) petrol engines,[1] which use a displacement of 500 cc (30.5 cu in) per cylinder.

BMW B38 engine
Overview
ManufacturerBMW
Production2013–present
Layout
Configurationstraight-3
Displacement1.2–1.5 L (73–92 cu in)
ValvetrainDOHC
Compression ratio11:1
Combustion
TurbochargerSingle-scroll
Fuel systemDirect injection
Fuel typeGasoline
Chronology
PredecessorBMW N13

The B38 is used in front-wheel drive cars (such as the Mini Hatch and BMW 2 Series Active Tourer), as well as BMW's traditional rear-wheel drive and all-wheel drive (xDrive) configurations. The first car to use the B38 is the BMW i8 hybrid sports coupé,[2] where it is used as a transverse mid-mounted engine.[3]

Design

The B38 features direct injection, an 11:1 compression ratio,[4] variable valve timing (double-VANOS) and a single-scroll turbocharger with the world's first aluminium turbine housing,[5][6] manufactured by Continental.

On the 1.2 Litre versions, the bore is 78 mm (3.1 in) and the stroke is 83.6 mm (3.3 in). On the 1.5 Litre versions, the bore is 82 mm (3.2 in) and the stroke is 94.6 mm (3.7 in).

Models
EngineDisplacementPowerTorqueYears
B38A12U0[7][8]1,198 cc (73 cu in)55 kW (74 bhp)
at 4,000 rpm		150 N⋅m (111 lb⋅ft)
at 1,400–4,000 rpm		2014–
75 kW (101 bhp)
at 4,250 rpm		180 N⋅m (133 lb⋅ft)
at 1,400–4,000 rpm		2014-
B38A15M0 / B38B15M0[8][9][10]1,499 cc (91 cu in)100 kW (134 bhp)
at 4,400–6,000 rpm		220 N⋅m (162 lb⋅ft)
at 1,250–4,300 rpm		2014–2018
B38K15T0[3]170 kW (228 bhp)
at 5,800 rpm		320 N⋅m (236 lb⋅ft)
at 3,700 rpm		2013–
B38A15M1/B38B15M1 (improvement of B38A15M0) 1,499 cc (91cu in) 104kW (141bhp) at 4,400-6,000rpm 220N•m (162lb•ft) at 1,250-4,300rpm 2018-

B38A12U0

Applications:[7]

55 kW (74 hp) version:

  • 2014–current F55/F56 Mini One First

75 kW (101 hp) version:

B38A15M0 / B38B15M0 (B38A15M1/B38B15M1 for post-2018 manufactured engines)

Applications:[9] 75 kW (101 hp) version:

  • 2015–current BMW F45/F46 216i Active Tourer / Gran Tourer
  • 2018–current F55/F56 Mini One

80 kW (107 hp) version:

100 kW (134 hp) version (104kW (141bhp) for post-2018 manufacture)

  • 2015–2019 BMW F20/F21 118i
  • 2015–current BMW F22/F23 218i coupe / convertible
  • 2014–current BMW F45/F46 218i Active Tourer / Gran Tourer
  • 2015–2019 BMW F30/F31 318i LCI
  • 2015–current BMW F48 X1 sDrive18i[11]
  • 2014–current Mini F55/F56/F57 Cooper
  • 2015–2019 Mini F54 Clubman
  • 2017–current Mini F60 Countryman
  • 2017–current BMW F39 X2 sDrive18i
  • 2017–current BMW F45 225xe Active Tourer (PHEV)
  • 2019–current BMW F40 118i
  • 2019–current BMW F44 218i Gran Coupé

B38K15T0

Applications:[3]

References
  1. "BMW modular engines: B37, B38, B47 and B48". www.bmwblog.com. Retrieved 10 May 2017.
  2. "BMW Dreizylinder-Motoren: Mehr Details im Interview mit Dr. Lopez". www.bimmertoday.de (in German). Retrieved 28 May 2017.
  3. "Product information: I12 Powertrain". www.bimmerpost.com. Retrieved 28 May 2017.
  4. "BMW B38 Three Cylinder Turbocharged Engines". www.unixnerd.co.uk. Retrieved 30 September 2020.
  5. Morey, Bruce (19 August 2014). "Inside Continental's new aluminum turbocharger". www.sae.org. Retrieved 30 September 2020.
  6. "Continental Supplies World's First Turbocharger with Aluminum Turbine Housing in Cars". www.continental.com. Retrieved 30 September 2020.
  7. "B38A12U0". bmwarchive.de. Archived from the original on 14 December 2014. Retrieved 14 December 2014.
  8. "3-CYLINDER GASOLINE ENGINES". www.bmwgroup.com. Archived from the original on 14 December 2014.
  9. "B38A15M0". www.bmwarchive.de. Archived from the original on 14 December 2014. Retrieved 14 December 2014.
  10. "HARDTOP 2 DOOR: ALL FEATURES". www.miniusa.com. Retrieved 29 December 2015.
  11. "BMW X!: At a glance". www.bmw.com. Retrieved 28 May 2017.
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