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Reciprocating internal combustion engine From Wikipedia, the free encyclopedia
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]
| BMW B58 | |
|---|---|
B58B30O1 in a G22 M440i | |
| Overview | |
| Manufacturer | BMW |
| Production | 2015–present |
| Layout | |
| Configuration | Straight-six |
| Displacement | 3.0 L (2,998 cc) |
| Cylinder bore | 82 mm (3.23 in) |
| Piston stroke | 94.6 mm (3.72 in) |
| Cylinder block material | Closed-deck aluminium |
| Cylinder head material | Aluminum |
| Valvetrain | DOHC 4 valves x cyl. with Valvetronic and Double VANOS |
| Valvetrain drive system | Chain |
| Compression ratio | 11.0:1 |
| RPM range | |
| Max. engine speed | 7,000 rpm |
| Combustion | |
| Supercharger | 48V electrical systems Starter Generator (2020; some models) |
| Turbocharger | Single twin-scroll turbocharger with air-to-liquid intercooler |
| Fuel system | Direct injection |
| Management | Bosch Di-Motronic |
| Fuel type | Petrol |
| Oil system | Wet sump with water heat exchanger |
| Cooling system | Water-cooled |
| Output | |
| Power output | 240–285 kW (322–382 hp) |
| Torque output | 450–500 N⋅m (332–369 lb⋅ft) |
| Dimensions | |
| Dry weight | 139 kg (306 lb) |
| Chronology | |
| Predecessor | BMW N55 |
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]
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 new 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]
| Engine | Power | Torque | Years |
|---|---|---|---|
| B58B30M0 | 213 kW (286 hp) at 5,000-6,500 rpm | 400 N⋅m (295 lb⋅ft) | 2022–present |
| 240 kW (322 hp) at 5,500–6,500 rpm | 450 N⋅m (332 lb⋅ft) at 1,380–5,000 rpm | 2015–2019 | |
| 250 kW (335 hp) at 5,500-6,500 rpm | 450 N⋅m (332 lb⋅ft) at 1,380–5,200 rpm | 2017–2019 | |
| 250 kW (335 hp) at 5,500 rpm | 500 N⋅m (369 lb⋅ft) at 1,520–4,500 rpm | 2016–Present | |
| 265 kW (355 hp) at 5,500-6,500 rpm |
500 N⋅m (369 lb⋅ft) at 1,520–4,800 rpm |
2016–2019 | |
| B58B30M1 | 250 kW (335 hp) at 5,500–6,500 rpm | 450 N⋅m (332 lb⋅ft) at 1,520–4,800 rpm |
2018– |
| B58B30C | 250 kW (335 hp) at 5,000–6,500 rpm |
500 N⋅m (369 lb⋅ft) at 1,600–4,500 rpm |
2018– |
| B58B30O1 | 285 kW (382 hp) at 5,000–6,500 rpm | ||
| B58B30M2 | 280 kW (375 hp) at 5,200-6,250 rpm |
520 N⋅m (384 lb⋅ft) at 1850-5000 rpm |
2022- |
| S58B30T0 | 338 kW (453 hp) at 6,250 rpm |
550 N⋅m (406 lb⋅ft) at 2,600–5,950 rpm |
2023– |
| 353 kW (473 hp) at 6,250 rpm |
2020– | ||
| 620 N⋅m (457 lb⋅ft) at 2,600–5,950 rpm |
2019– | ||
| 375 kW (503 hp) at 6,250 rpm |
650 N⋅m (479 lb⋅ft) at 2,600–5,950 rpm |
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This version was used for 3-/4-Series with the "M Performance Power and Sound Kit".
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| BMW S58 engine | |
|---|---|
 | |
| Overview | |
| Production | 2019–present |
| Layout | |
| Configuration | Straight-six |
| Displacement | 3.0 L (2,993 cc) |
| Cylinder bore | 84 mm (3.3 in) |
| Piston stroke | 90 mm (3.5 in) |
| Cylinder block material | Closed-deck aluminum |
| Cylinder head material | Aluminum |
| Valvetrain | DOHC w/ VVT & VVL |
| Compression ratio | 9.3:1 |
| RPM range | |
| Max. engine speed | 7,200 RPM |
| Combustion | |
| Turbocharger | Twin-Turbo with air-to-liquid intercooler |
| Fuel system | Direct injection |
| Fuel type | Petrol |
| Output | |
| Power output | 338–417.59 kW (453–560 hp) |
| Torque output | 550–650 N⋅m (406–479 lb⋅ft) |
| Chronology | |
| Predecessor | BMW S55 |
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]
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