BMW B48. The BMW B48 is a turbocharged inline-four petrol engine which replaced the BMW N20 and has been in production since 2014. It was first used in the F56 Mini Hatch and has been used in BMW applications since 2015.

The B48 is part of a modular BMW engine family of 3-cylinder (B38/B37), 4-cylinder (B48/B47) and 6-cylinder (B58/B57) engines, which use a displacement of  per cylinder.

Design 
Compared with its N20 predecessor, the B48 uses a more undersquare design, and an engine block using "closed-deck construction". As with the N20, the block and head are made from aluminium. Other features shared with the N20 include a twin-scroll turbocharger, direct injection, variable valve lift (Valvetronic) and variable valve timing (Double VANOS).

Technical Update versions 
The B48 engine was revised in 2018, dubbed "B48TU" ("Technical Update"), with notable changes and improvements; a new one-part timing chain as opposed to the earlier two-part, a new separate cooling circuits for the cylinder head and crankcase, and forged conrods and forged crankshaft is now  lighter due to the use of lighter materials and different machining. The fuel system also upgraded with the new Bosch HDP6 high pressure fuel pump and Bosch HDEV6 injectors that borrows from the P48 Turbo Engine.

Models

115 kW version 
 2020–present G20 318i
 2022–present G42 218i

125 kW version 
 2019–present G20 320i (Turkish and Tunisian market)
 2020–present G22 420i (Turkish market)
 2021–present G26 420i (Turkish market)
 2017–present G30 520i (Turkish and Tunisian market)
 2018–present G01 X3 sdrive20i (Turkish market)

131 kW version 
 2021–present F54 MINI Cooper S Clubman (B48A20M)
 2020–present F40 BMW 120i

135 kW version 
When combined with the electric motor, the 330e and 530e overall output is  and .

 2016–2019 F20 120i
 2016–2019 F22/F23 220i
 2015–2019 F30/F31/F34 320i
 2016–2019 F30 330e
 2016–2019 F32/F33/F36 420i
 2017–present G30/G31 520i
 2018–present G30/G31 530e
 2018–present G01 X3 xDrive20i
 2018–present G02 X4 xDrive20i
 2019–present G20 320i
 2019–present G20 330e
 2020–present G22 420i
 2021–present G42 220i

141 kW version 

 2017–2020 F60 MINI Cooper S Countryman
 2014–2017 F45 BMW 2 Series Active/Gran Tourer 220
 2024–present G45 X3 20/30e xDrive

145 kW version   
In the MINI Cooper S, a temporary overboost increases peak torque by  to .

 2014–present F56 MINI Cooper S (B48A20A)
 2020–present F44 220i Gran Coupe
 2016–present F48 X1 20i
 2017–present F39 X2 sDrive20i
2018–present G29 Z4 sDrive20i
 2019–present J29/DB82 Toyota Supra (Japanese SZ models)

165 kW version 
 2016–2019 F20 125i
 2021–present U06 223i

170 kW version 
 2014–present F56 MINI JCW Hardtop and JCW Cabrio (320 Nm)
 2017–present F56 MINI JCW Clubman and JCW Countryman ALL4 (350 Nm)
 2015–present F45 Active Tourer 225i
 2016–present F48 X1 25i/28i
 2017–present F39 X2 25i/28i
 2019–current F44 228i Gran Coupé xDrive

180 kW version 
 2022–present G42 230i
 2022–present G20/G21 330i
 2022–present G22 430i
 2023–present U11 X1 28i xDrive

185 kW version 
 2015–2019 F30/F31/F34 330i
 2016–present F22/F23 230i
 2016–present F32/F33/F36 430i
 2018–present G01 X3 xDrive30i
 2018–present G02 X4 xDrive30i
 2020–present G01 X3 xDrive30e (PHEV Version)
 2016–present G30/G31 530i

190 kW version 
 2016–present G11 730i/730Li
 2017–2019 G11 740e xDrive/740Le xDrive (combined with an 82 kW electric motor for a total output of 240 kW)
 2017–2021 G32 630i
 2019–2022 G20/G21 330i
 2019–present G29 Z4 sDrive30i
 2019–present J29/DB22 Toyota Supra
 2020–present Morgan Plus Four
 2020–present G22/G23/G26 430i

195 kW version 
 2020–present BMW F40 128ti

225 kW version 
Introduced in May 2019 this engine features a reinforced crankshaft with larger main bearings and new pistons with a lower 9.5:1 compression ratio, this allows the engine to take more boost pressure from a larger turbocharger, which blows compressed air through a reworked intake tract.

2019–present F40 M135i xDrive
2019–present F44 M235i xDrive Gran Coupé
2019–present F39 X2 M35i xDrive
2019–present F54 Clubman JCW
2019–present F60 Countryman JCW
2020–present F56 MINI John Cooper Works GP                                                                                                                                                    
2024–present U11 X1 M35i xDrive

References 

B48
Products introduced in 2014
Straight-four engines
Gasoline engines by model