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BMW B38 engine
BMW B38 engine
BMW B38 engine
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B38 engine
Overview
ManufacturerBMW
Production2013–present
Layout
ConfigurationStraight-3
Displacement1.2 L (1,198 cc)
1.5 L (1,499 cc)
Cylinder bore78 mm (3.1 in)
82 mm (3.2 in)
Piston stroke83.6 mm (3.29 in)
94.6 mm (3.72 in)
ValvetrainDOHC
Compression ratio11:1
Combustion
TurbochargerSingle-scroll
Fuel systemDirect injection
Fuel typeGasoline
Chronology
PredecessorBMW N13

The BMW B38 is a 1.2 and 1.5 L (1,198 and 1,499 cc) turbocharged straight-three DOHC petrol engine, which replaced the straight-four BMW N13. Production started in 2013.

It is part of a modular BMW engine family, of straight-three (B38), straight-four (B48) and straight-six (B58) alloy block and head petrol engines,[1] which use a displacement of 400 cc (24.4 cu in) per cylinder in the 1.2 and 500 cc (30.5 cu in) per cylinder in the 1.5. It specifically shares a lot of components with the BMW B37, due to their same size/configuration.

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

[edit]

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

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

Models

[edit]
Engine Displacement Power Torque Years
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)–116 kW (156 bhp)
at 4,400–6,000 rpm		 220 N⋅m (162 lb⋅ft)–230 N⋅m (170 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 (91 cu in) 104 kW (139 bhp)

at 4,400–6,000 rpm

220 N⋅m (162 lb⋅ft)

at 1,250–4,300 rpm

2018–

B38A12U0

[edit]

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)

[edit]

Applications:[9]

75 kW (101 hp) version:

  • 2015–2021 BMW F45/F46 216i Active Tourer / Gran Tourer
  • 2018–present 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
  • 2015–2021 BMW F22/F23 218i coupe / convertible
  • 2014–2021 BMW F45/F46 218i Active Tourer / Gran Tourer
  • 2015–2019 BMW F30/F31 318i LCI
  • 2015–2021 BMW F48 X1 sDrive18i[11]
  • 2014–present Mini F55/F56/F57 Cooper
  • 2015–2019 Mini F54 Clubman
  • 2017–present Mini F60 Countryman
  • 2017–2023 BMW F39 X2 sDrive18i
  • 2017–2021 BMW F45 225xe Active Tourer (PHEV)
  • 2019–present BMW F40 118i
  • 2019–present BMW F44 218i Gran Coupé
  • 2020–2023 BMW F39 xDrive25e116 kW (156 bhp) version:

B38A15M2

[edit]

Applications:

B38K15T0

[edit]

Applications:[3]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

BMW B38 engine

View on Grokipedia
from Grokipedia
The B38 is a family of turbocharged inline-three-cylinder petrol engines developed by as part of its modular B-series engine architecture, featuring a displacement of 1.5 litres (1,499 cc) and introduced to production in 2013 for use in both and vehicles. This compact engine, built on an aluminum block with a bore of 82 mm and a stroke of 94.6 mm, incorporates advanced technologies including (a single twin-scroll ), high-precision direct fuel injection, variable valve lift control, and Double variable camshaft timing to optimize efficiency and performance. Power outputs across variants range from 75 kW (102 hp) at 4,250 rpm to 170 kW (231 hp) at 5,800 rpm, with maximum reaching up to 320 Nm at 3,700 rpm, depending on the tune and application such as the high-output version in the hybrid . The design emphasizes a modular 500 cc per cylinder approach, enabling shared components with larger B48 four-cylinder and B58 six-cylinder engines while delivering 5–15% better fuel economy than predecessor four-cylinder units like the N20. The B38 powers a range of front-wheel-drive and all-wheel-drive models, including the and One, (116i/118i), 2 Series Active/Gran Tourer (218i), X1 (sDrive18i), X2 (sDrive18i), and 3 Series (318i in select markets), as well as serving as the range-extender in the i8. A smaller 1.2-litre (1,198 cc) variant with 78 mm bore and 83.6 mm stroke exists for entry-level applications, producing around 75–102 hp. Overall, the engine balances responsive low-end torque, refined operation, and compliance with Euro 6 emissions standards, contributing to BMW's downsizing strategy for compact premium vehicles.

Introduction and Development

Overview

The BMW B38 is a turbocharged straight-three DOHC available in 1.2 L and 1.5 L displacements. It was developed as a replacement for the previous BMW N13 straight-four engine. As part of BMW's modular engine architecture, the B38 shares core components, such as 500 cc per cylinder displacement and alloy block construction, with the larger B48 inline-four and B58 inline-six engines, enabling scalable production and design efficiencies. Production of the B38 began in 2013 at BMW's facilities, including the plant in , and it remains in active use as of 2025 in various models. The engine emphasizes compact dimensions for front-wheel-drive applications, fuel efficiency through technologies like , and a broad power spectrum ranging from 75 PS (74 hp) in entry-level 1.2 L variants to 231 PS (228 hp) in high-performance 1.5 L versions. This design positions the B38 as a versatile powerplant in BMW's efficient small-car lineup, balancing performance with emissions compliance.

History and Development

The B38 engine's development originated in as part of BMW's shift toward a new modular engine architecture, with initial announcements highlighting its role as the smallest inline-three variant in the family. Prototyping occurred that year, including early testing in F20 1 Series hatchback prototypes to evaluate performance and integration. Engineered to comply with increasingly stringent emissions regulations, including Euro 6 standards effective from 2014, the B38 emphasized efficiency through its , which shared core components like block architecture with larger siblings such as the B48 and B58 for scalable production and reduced development costs. Key milestones included a production ramp-up at BMW's plant in starting in 2013, following a €90 million to adapt facilities for the modular family. The engine debuted in production vehicles in 2014, powering the hybrid sports car as a and the third-generation MINI Hatch (F56), marking BMW's initial applications of the three-cylinder in consumer models. A primary challenge during development was mitigating the inherent vibrations typical of three-cylinder configurations, which can cause fore-aft oscillations along the axis. BMW addressed this through a counter-rotating integrated into the and a damper using a centrifugal pendulum principle, ensuring refined operation even at low speeds. Following the introduction of the Worldwide Harmonized Light Vehicles Test Procedure (WLTP) in 2018, the B38 received updates including the addition of a particulate filter to meet Euro 6d-TEMP requirements, further enhancing emissions compliance without compromising performance.

Design Features

Architecture and Specifications

The BMW B38 engine employs an layout with a double overhead (DOHC) , featuring four valves per for efficient gas flow. The engine block and head are constructed from aluminum alloy, contributing to a lightweight design while maintaining structural integrity; the block includes plasma-sprayed steel liners and a closed-deck configuration for enhanced durability. Available displacements are 1,198 cc for the 1.2 L variant, achieved via a 78 mm bore and 83.6 mm stroke, and 1,499 cc for the 1.5 L variant with an 82 mm bore and 94.6 mm stroke. Compression ratios vary by variant, typically 11:1 for standard configurations and lower (e.g., 9.5:1) for high-performance tunes. Fuel delivery is handled by a high-precision direct injection system, which atomizes directly into the for improved efficiency and emissions control. The cooling system incorporates a cross-flow design in the , directing from the hotter exhaust side toward the cooler side to optimize thermal management. is managed through a system with an integrated oil pump, ensuring consistent oil distribution to critical components under varying operating conditions. A twin-scroll is integrated into the for compact packaging and responsive boost delivery.

Technologies and Innovations

The BMW B38 engine incorporates TwinPower Turbo technology, utilizing a single twin-scroll equipped with an aluminum turbine housing to facilitate rapid spool-up and enhanced responsiveness across the rev range. This design minimizes turbo lag while optimizing exhaust flow by separating pulses from cylinder pairs, contributing to improved and power delivery. The integration of the directly into the further accelerates boost buildup, allowing the three-cylinder configuration to punch above its displacement in terms of . Complementing the turbo system, the B38 features and Double technologies for precise control over operation. provides fully , greatly reducing the need for a traditional throttle body and enabling continuous adjustment of air volume to match engine demands, which enhances airflow efficiency and reduces pumping losses. Double , meanwhile, adjusts timing on both and exhaust sides, optimizing overlap for better at low speeds and improved fuel economy throughout the operating range. Together, these systems allow for seamless transitions between part-load efficiency and full-throttle performance, while lowering emissions through more complete combustion. The engine's aluminum alloy design plays a key role in achieving overall lightness and refinement, dampening noise and vibration transmission. This construction not only aids in meeting stringent vehicle weight targets for better dynamics and economy but also incorporates a closed-deck for structural integrity under high boost pressures. For emissions management, the B38 integrates an (EGR) system with close-coupled catalyst placement, where cooled exhaust gases are recirculated back into the intake to lower combustion temperatures and reduce formation. The catalyst, positioned near the , achieves rapid light-off for effective and CO conversion, ensuring compliance with Euro 6 standards from the outset. This setup balances environmental performance with drivability, minimizing any impact on response. To address the inherent vibrations of a three-cylinder layout, the B38 employs a counter-rotating integrated into the below the , which offsets secondary imbalances at twice the crankshaft speed. This innovation significantly reduces NVH levels, making the engine feel as refined as a four-cylinder unit without adding excessive weight or complexity.

Variants and Specifications

B38A12U0 (1.2 L)

The B38A12U0 represents the entry-level 1.2-liter displacement variant within the B38 modular engine family, sharing the core inline-three architecture with an aluminum block and , dual overhead camshafts, and direct . This configuration emphasizes low-end delivery and for urban-oriented driving, distinguishing it through specific tuning calibrated to its 1,198 cc capacity. Available in two power outputs, the engine delivers 55 kW (75 PS; 74 hp) at 4,000 rpm with 150 N⋅m (153 kg⋅m; 111 lbf⋅ft) of from 1,400 to 4,000 rpm in its base tuning, or 75 kW (102 PS; 101 hp) at 4,250 to 6,000 rpm with 180 N⋅m (184 kg⋅m; 133 lbf⋅ft) from 1,400 to 4,000 rpm in the higher-output version. The stands at 7,000 rpm for both configurations, enabling responsive performance within constraints. Fuel economy estimates highlight its efficiency focus, with combined consumption ranging from 4.6 to 5.2 L/100 km (51.1 to 45.2 mpg US) in typical applications, depending on the power level and transmission. Compared to the 1.5 L variants, the B38A12U0 employs a smaller turbocharger and fuel injectors to optimize low-speed response and reduce emissions in city driving, prioritizing economy over peak power.

B38A15M0/B38B15M0 and Updates (1.5 L Standard)

The B38A15M0 and B38B15M0 variants represent the standard 1.5-liter configurations of BMW's modular three-cylinder engine family, with the "A" denoting front-wheel-drive applications (primarily in MINI models) and the "B" indicating rear-wheel-drive setups (common in BMW vehicles). These engines deliver balanced performance for entry-level models, emphasizing efficiency and drivability. Prior to 2018, the standard output was 100 kW (134 hp) at 4,400–6,000 rpm, while a higher tune in select applications reached 116 kW (156 hp). A detuned version producing 90 kW (122 PS; 120 hp) at 4,400–6,500 rpm with 230 N⋅m (170 lb⋅ft) from 1,500–4,000 rpm was introduced for the 2025 BMW 1 Series 116i facelift (F70). Torque production in these variants ranges from 220–230 N⋅m (162–170 lb⋅ft), available across a broad band of 1,250–4,000 rpm, enabling responsive low-end acceleration suitable for urban and highway driving. The engine maintains a of 7,000 rpm, contributing to its rev-happy character despite the compact displacement. Following the introduction of the Worldwide Harmonized Light Vehicles Test Procedure (WLTP) in , BMW updated the engine to variants designated B38A15M1 and B38B15M1, incorporating revised ECU mapping and modifications to ensure compliance with stricter emissions standards. These changes resulted in a slight power adjustment to 104 kW (139 hp) at 4,400–6,000 rpm in many markets, with remaining at 220 N⋅m (162 lb⋅ft) from 1,250–4,300 rpm; some regions experienced minor detuning to optimize real-world fuel economy and pollutant levels under the new testing regime. The updates also included enhancements to the TwinPower Turbo system and for improved efficiency without compromising the engine's core dynamics.

B38K15T0 (1.5 L High-Performance)

The B38K15T0 represents the high-performance iteration of BMW's 1.5-liter inline-three engine, engineered specifically for integration into the . This variant produces 170 kW (228 hp; 231 PS) of power at 5,800 rpm and 320 N⋅m (236 lb⋅ft) of torque at 3,700 rpm, enabling seamless synergy with the front-mounted to achieve a combined system output exceeding 260 kW. These figures reflect BMW's modular B38 family scalability, adapted here for elevated performance demands while maintaining compact dimensions. To accommodate higher boost levels and the thermal stresses of hybrid operation, the B38K15T0 incorporates reinforced internal components, including upgraded pistons and rods, along with an enhanced cooling system for improved heat dissipation during sustained high-load conditions. The engine retains BMW's TwinPower Turbo technology with a single twin-scroll , optimized via a larger for quicker response and greater airflow to support the increased power delivery without compromising drivability. In the application, the B38K15T0 contributes significantly to the vehicle's hybrid efficiency, helping achieve a combined fuel consumption of 2.1 L/100 km (134 mpg-imp; 112 mpg-US) under NEDC testing cycles, alongside low CO2 emissions of 49 g/km. This performance-oriented tuning underscores the engine's role in balancing explosive acceleration—such as the i8's 0-100 km/h sprint in under 4.5 seconds—with exemplary in a carbon-fiber .

Applications

BMW Models

The BMW B38 engine powers several entry-level models across BMW's 1 Series lineup. In the second-generation 1 Series (F20/F21 chassis, produced from 2015 to 2019), it equipped the 118i variant, delivering efficient performance in a compact hatchback configuration. The third-generation 1 Series (F40 chassis, introduced in 2019 and continuing to the present) utilizes the B38A15M0 variant in models such as the 116i and 118i, providing balanced power for urban driving without significant alterations in recent years. Within the 2 Series family, the B38 serves front-wheel-drive applications in multi-purpose vehicles. The 218i Active Tourer (F45 chassis) and Gran Tourer (F46 chassis), produced from 2014 to 2021, incorporate the engine for family-oriented versatility. The 218i Gran Coupé (F44 chassis, available since 2019 and ongoing) employs the B38 for a sportier sedan profile, emphasizing agile handling in compact dimensions. The B38 found limited use in the 3 Series, specifically the 318i models on the F30 sedan and F31 wagon from 2015 to 2019, where it offered a fuel-efficient option for the midsize segment. In BMW's X Series crossovers, the engine powers base petrol trims. The X1 sDrive18i (F48 , 2015–2022) integrates the B38 for capable everyday utility in a subcompact . The second-generation X1 sDrive18i (U11 , 2022–present) continues to use the B38. Similarly, the X2 sDrive18i (F39 , 2017–2022) uses the B38 to deliver responsive performance in a coupe-style crossover. The second-generation X2 sDrive18i (U10 , 2024–present) also employs the B38. The high-performance B38K15T0 variant appears in the i8 hybrid sports car (I12 chassis, 2014–2020), where it complements the electric motor for efficient yet potent all-wheel-drive propulsion. For plug-in hybrid applications, the B38 equips the 225xe Active Tourer (F45 chassis, 2017–2021), pairing with an electric motor to enhance the MPV's range and emissions profile.

MINI Models

The BMW B38 engine has been a key powerplant for various models since 2014, leveraging the BMW Group's modular platform architecture to enable seamless integration across front-wheel-drive vehicles and shared manufacturing efficiencies with BMW counterparts. This design commonality allows to adopt advanced features like TwinPower Turbo technology and direct injection while maintaining the brand's characteristic go-kart handling in compact packages. In the and lines (chassis codes F55, F56, and F57, produced from 2014 to the present), the B38 powers Cooper variants, with the 1.2-liter B38A12U0 serving as the entry-level option in models like the MINI One First and the 1.5-liter B38A15M0 in standard Cooper trims, delivering outputs ranging from 101 to 156 hp depending on tuning; however, as of 2025, the B38 has been phased out in new models (J01/F66 platform) in favor of a 2.0-liter B48 four-cylinder for base variants in select markets, though it continues in existing F56/F55/F57 production for some global markets. Similarly, the MINI Clubman (F54, 2015–2024) employs the B38A15M0 in its Cooper configuration, providing a balance of efficiency and performance in the estate-style body. The MINI Countryman (F60, 2017–2023) also utilized the B38A15M0 for Cooper models, enhancing the crossover's versatility with the engine's compact footprint and responsive turbocharging; the successor U25 generation (2024–present) does not use the B38. As of 2025, no major new applications for the B38 have been introduced, reflecting a strategic shift toward and larger-displacement engines in updated lineups; for instance, the latest models in select markets have phased out the three-cylinder B38 in favor of a 2.0-liter four-cylinder unit to meet evolving emissions standards and consumer preferences. This transition marks the end of the B38's role in newer MINI iterations, though it continues in existing production runs for global markets.

Production and Reception

Manufacturing Details

The BMW B38 engine is primarily manufactured at the BMW Group Plant in , the company's largest engine production facility, where series production of the modular B-series engines, including the B38, commenced in 2013. This plant, employing around 4,900 workers, handles the assembly of , diesel, and hybrid powertrains, with the B38 integrated into its high-volume lines dedicated to the BMW Group's family. The B38's modular architecture facilitates efficient assembly by sharing production processes and tooling with related engines like the B48 and B58, allowing for flexible scaling on common lines at . This setup supports an annual output capacity exceeding 1 million engines at the facility, with the B38 contributing significantly to volumes for and models since its introduction. Key supplier integrations enhance the manufacturing process, with Bosch providing the high-pressure direct fuel injectors essential for the B38's TwinPower Turbo system. Similarly, Continental supplies the units, ensuring consistent performance across variants. To meet diverse global market requirements, the B38 incorporates ECU calibrations adapted to regional fuel standards, such as optimization for 98 RON fuel in and 91 AKI premium gasoline in the United States, preventing knock and maintaining efficiency without hardware changes.

Reliability and Common Issues

The BMW B38 engine demonstrates strong overall reliability for a compact three-cylinder turbocharged petrol unit, with many installations achieving lifespans exceeding 200,000 km under regular maintenance and fleet usage. Its modular design, sharing components with the larger B48 engine, contributes to durability, though it requires diligent care to avoid accelerated wear from its high-revving nature and direct injection system. Many B38 engines reach high mileage without major problems when properly maintained. Maintenance for the B38 follows BMW's Condition Based Service (CBS) protocol, recommending oil and filter changes every 16,000 km (10,000 miles) or annually, using synthetic oils meeting BMW Longlife-01 specifications to ensure proper turbo lubrication and cooling. Timing inspections are advised after 100,000 km, as stretch can occur, and levels should be monitored regularly with flushes every 4–5 years. Adhering to these intervals, supplemented by premium fuel to minimize carbon deposits, supports the engine's expected longevity, while deviations—such as extended oil intervals—can reduce to under 150,000 km by promoting sludge buildup and component degradation. For used vehicles equipped with the B38, it is advisable to check for unusual noises, review service history, and run diagnostics to assess condition. Common issues include carbon buildup on intake valves from direct injection, manifesting as rough idling, misfires, and decreased fuel economy after 40,000–60,000 km; this is addressed via walnut blasting cleaning. Timing chain stretch or failure, a primary issue in early versions (pre-2017/2018) due to material weaknesses, often around 100,000–150,000 km, can cause rattling noises especially during cold starts and misfires, requiring replacement to prevent severe engine damage; improvements after 2017/2018 have reduced occurrences in later models. Coolant system failures, such as electric water pump or thermostat issues around 80,000–110,000 km, may lead to overheating and need prompt attention. Turbocharger failures, often due to neglected oil changes leading to poor lubrication, may cause whining noises, power loss, or smoke, with seals particularly vulnerable in high-mileage units. Engine mount wear contributes to vibrations, especially at idle, though hydraulic mounts in post-2015 models help mitigate this; replacements are common around 80,000–100,000 km to restore smoothness. Oil leaks from valve covers or filter housings and excessive consumption from worn piston rings are also reported, potentially triggering low-pressure warnings if unaddressed. In F20 118i models, electronic power steering issues, including vague or imprecise steering particularly at higher speeds, have been noted, often related to steering rack problems. Service bulletins highlight early concerns, such as guide bearing damage requiring engine replacement in select 2014–2016 models affected by manufacturing variances. solenoid faults can illuminate the and induce limp mode, often resolved via software recalibration or component swaps. Coolant leaks at the housing, noted in 2014–2015 F56 applications, pose overheating risks and were addressed through free repairs.

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  54. https://static.nhtsa.gov/odi/tsbs/2016/MC-10146800-9999.pdf
  55. https://static.nhtsa.gov/odi/tsbs/2016/MC-10151227-9999.pdf
  56. https://static.nhtsa.gov/odi/tsbs/2014/MC-10148202-9999.pdf
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