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BMW B58
Reciprocating internal combustion engine From Wikipedia, the free encyclopedia
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The BMW B58 is a turbocharged straight-six engine, which began production in 2015.[1] The B58 replaced the N55 and was launched in the F30 340i.[2]
The B58 is part of BMW's modular engine family, each engine using a displacement of 500 cc (30.5 cu in) per cylinder, following the B38 and B48 engine.[3]
The B58 engine was named to Ward's World's 10 Best Engines four times, in 2016 (installed in the 340i),[4] 2017 (M240i),[5] 2019 (X5)[6] and 2020 (M340i).[7]
The S58 engine, which was released in early 2019, is the high-performance version of the B58.[8][9] It was named to Ward's World's 10 Best Engines in 2023 (installed in the M2).[10]
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Design
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Compared with its BMW N55 predecessor, the B58 features a 20% increase in boost pressure, a closed-deck engine block design, an increase in compression ratio to 11.0:1 and a slight increase in displacement from 2,979 to 2,998 cc (181.8 to 182.9 cu in) with added weight of 8 kg (18 lb).
The turbocharger is a twin-scroll design, for more efficient power delivery with less turbo lag and more power than a conventional single turbocharger, as well as for weight and space saving benefits.[11] The intercooler - a water-to-air design - is integrated into the intake plenum, to reduce the volume of air between the turbocharger and the cylinders.[12][13]
As per the N55, the B58 also features direct fuel injection, variable valve timing (called double VANOS by BMW), and variable valve lift (called Valvetronic by BMW).[14][15] The redline remains at 7,000 rpm, the bore and the stroke is 82 mm × 94.6 mm (3.23 in × 3.72 in).
The B58 also features an engine-mounted heat encapsulation system to reduce engine wear and emissions during start-up.[16]
For durability and longevity, the rotating assembly has a forged steel crankshaft and forged connecting rods.[17][18]
As a part of BMW's modular engine family, the crankcase is a completely new design identical to the B57 diesel version,[19] engineered as both a gasoline and diesel engine in one common part. The closed deck crankcase is equipped with a completely new structure which can be identified by a complex array of ribs on the exhaust and intake side and an additional reinforcement frame on the oil pump side.
The engine was revised in 2018, dubbed "B58TU", with notable changes and improvements. The fuel system was updated with 75% increased pressure with updated high pressure fuel pump and injectors, a new particulate filter in the catalytic converter, a new one-part timing chain as opposed to the earlier two-part, and new separate cooling circuits for the cylinder head and crankcase. For weight savings, the crankcase wall thickness and forged crankshaft were optimized, and the exhaust manifold was integrated into the cylinder head housing.[20]
Another engine revision in 2022 added port fuel injection to complement the existing direct injection system for better emissions and functionality.[21]
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Models
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B58B30M0: 213 kW (290 PS; 286 hp)
Applications:
- 2023–present G70 735i (some markets)[23]
- 2021–present G30 545e
- 2022–present Ineos Grenadier
B58B30M0: 240 kW (326 PS; 322 hp)
Applications:
- 2015–2019 F30/F31/F34 340i
- 2016–2019 F32/F33/F36 440i
- 2016–2019 G11/G12 740i/Li
B58B30M0: 250 kW (340 PS; 335 hp)
Applications:
B58B30M0: 265 kW (360 PS; 355 hp)
This version was used for 3-/4-Series with the "M Performance Power and Sound Kit".
Applications:
- 2016–2019 F30/F31/F34 340i[26]
- 2016–2019 F32/F33/F36 440i
- 2017–2019 G01 X3 M40i[27]
- 2018–2019 G02 X4 M40i
B58B30M1: 250 kW (340 PS; 335 hp)
Applications:
B58B30C: 250 kW (340 PS; 335 hp)
Applications:
- 2019–2025 Morgan Plus Six[30]
- 2020 J29/DB Toyota Supra[31]
- 2022–present Ineos Grenadier (detuned to 286 ps)
B58B30O1: 285 kW (387 PS; 382 hp)
Applications:
- 2019–2026 G29 Z4 M40i (in countries not subject to EU emissions standards)
- 2019–2024 G20/G21 M340i
- 2020–2024 G01 X3 M40i
- 2019–2024 G02 X4 M40i
- 2021–present G22/G23/G26 M440i
- 2021–present Toyota Supra[31] (in countries not subject to EU emissions standards)
- 2021–present G42 M240i
- 2021–present Boldmen CR4
B58B30O1: 324 kW (441 PS; 434 hp)
Applications:
- 2025 Toyota Supra A90 Final Edition (324 kW)[22]
B58B30M2: 285 kW (388 PS; 393 hp)
Applications:
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S58
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The S58 engine is the high-performance version of the B58 engine. It was introduced in the F97 X3 M and F98 X4 M, marking the first time a stand-alone M model was produced for the X3 and X4.[33]
The S58 features twin mono-scroll turbochargers, a compression ratio of 9.3:1, a redline at 7,200 rpm with the bore and the stroke at 84 mm × 90 mm (3.31 in × 3.54 in). It also features a forged chrome molybdenum heat-treated steel crankshaft, plus forged steel connecting rods and forged aluminum pistons. The pistons are forged by Mahle and feature their proprietary anti-friction coating.[34]
Like the B58, the S58 also features direct fuel injection, variable valve timing (called double VANOS by BMW), and variable valve lift (called Valvetronic by BMW).
As opposed to the B58, the S58 features a slightly smaller displacement, increased bore, decreased stroke, and larger valves. Compression is decreased to 9.3:1 from 11.0:1. The S58 favors top-end power and has a higher redline of 7,200 RPM.[34]
S58B30T0: 338 kW (460 PS)
- 2023–2024 G87 M2
S58B30T0: 344 kW (468 PS)
- 2019–2022 G21 Alpina B3
S58B30T0: 353 kW (480 PS)
Applications:
S58B30T0: 364 kW (495 PS)
S58B30T0: 375 kW (510 PS)
Applications:
S58B30T0: 405 kW (550 PS)
Applications:
S58B30T0: 412 kW (560 PS)
Applications:
- 2023 G82 BMW 3.0 CSL
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References
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