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Turbocharged inline-four petrol engine From Wikipedia, the free encyclopedia
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.
| BMW B48 | |
|---|---|
| |
| Overview | |
| Manufacturer | BMW |
| Production | 2014–present |
| Layout | |
| Configuration | Inline-four |
| Displacement | 1,597 cc (97 cu in) 1,998 cc (122 cu in) |
| Cylinder bore | 82.0 mm (3.23 in) |
| Piston stroke | 75.6 mm (2.98 in) 94.6 mm (3.72 in) |
| Cylinder block material | Aluminium |
| Cylinder head material | Aluminium |
| Valvetrain | DOHC, with VVT & VVL |
| Valvetrain drive system | Chain |
| Compression ratio | 8.9:1 11:1 |
| Combustion | |
| Turbocharger | Single twin-scroll with air-to-liquid intercooler |
| Fuel system | Bosch HDEV5/HDEV5 EVO 200 bar (2,901 psi) central high-pressure Gasoline direct fuel injection. One direct injector per cylinder fed by an Bosch engine-driven high-pressure fuel pump (B48 non-TU) Bosch HDEV6 350 bar (5,076 psi) central high-pressure gasoline direct fuel injection. One direct injector per cylinder fed by an Bosch HDP6 engine-driven high-pressure fuel pump (B48TU) |
| Management | Bosch Di-Motronic |
| Fuel type | Petrol |
| Oil system | Wet sump with water heat exchanger |
| Cooling system | Water-cooled |
| Output | |
| Power output | 115–225 kW (154–302 hp) |
| Torque output | 250–450 N⋅m (184–332 lb⋅ft) |
| Chronology | |
| Predecessor | BMW N20 |
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,[1] which use a displacement of 500 cc (30.5 cu in) per cylinder.
Compared with its N20 predecessor, the B48 uses a more undersquare design, and engine block in "closed-deck construction".[2] As with the N20, the block and head are made from aluminium.[3] Other features shared with the N20 include a twin-scroll turbocharger, direct injection, variable valve lift (Valvetronic) and variable valve timing (Double VANOS).[4]
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 crankshaft is now 2.03 lb (1 kg) 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.[5]
| Engine | Power | Torque | Years | |
|---|---|---|---|---|
| B48B16 | 1,597 cc (97 cu in) | 125 kW (168 hp) at 5,000–6,000 rpm | 250 N⋅m (184 lb⋅ft) at 2,000–4,700 rpm | 2017– |
| B48B20 | 1,998 cc (122 cu in) | 115 kW (154 hp) at 4,500–6,500 rpm | 250 N⋅m (184 lb⋅ft) at 1,300–4,300 rpm | 2020– |
| B48A20U1 | 131 kW (176 hp)
at 5,000–5,500 rpm |
280 N⋅m (207 lb⋅ft)
at 1,350–4,200 rpm | ||
| B48B20M0 | 135 kW (181 hp) at 5,000–6,500 rpm | 270 N⋅m (199 lb⋅ft) at 1,350–4,600 rpm | 2016– | |
| 135 kW (181 hp) at 5,000–6,500 rpm |
290 N⋅m (214 lb⋅ft) at 1,350–4,250 rpm | |||
| B48A20M1 | 141 kW (189 hp) at 5,000–6,500 rpm |
280 N⋅m (207 lb⋅ft) at 1,250–4,600 rpm |
2014– | |
| 141 kW (189 hp) at 4,700–6,000 rpm |
280 N⋅m (207 lb⋅ft) at 1,250–4,750 rpm | |||
| 141 kW (189 hp) at 5,000–6,000 rpm |
280 N⋅m (207 lb⋅ft) at 1,350–4,600 rpm | |||
| 195 kW (261 hp) at 5,000–6,000 rpm |
400 N⋅m (295 lb⋅ft) at 1,350–4,600 rpm | |||
| B48B20M1 | 145 kW (194 hp) at 4,500–6,600 rpm | 320 N⋅m (236 lb⋅ft) at 1,450–4,200 rpm | 2019– | |
| B48B20O1 | 165 kW (221 hp) at 5,000–6,500 rpm | 310 N⋅m (229 lb⋅ft) at 1,400–5,000 rpm | 2016– | |
| B48A20O1 | 170 kW (228 hp) at 5,000–6,000 rpm | 350 N⋅m (258 lb⋅ft) at 1,250–4,500 rpm | 2015– | |
| 170 kW (228 hp) at 5,200–6,200 rpm |
300 N⋅m (221 lb⋅ft) at 1,250–4,800 rpm | |||
| 170 kW (228 hp) at 5,000–6,000 rpm |
350 N⋅m (258 lb⋅ft) at 1,450–4,500 rpm | |||
| B48O1ZIK | 180 kW (241 hp) at 4,500–6,500 rpm |
400 N⋅m (295 lb⋅ft) at 1,600–4,000 rpm |
||
| B48B20O0 | 185 kW (248 hp) at 5,200–6,500 rpm | 350 N⋅m (258 lb⋅ft) at 1,450–4,800 rpm |
2015– | |
| B48B20O1 | 190 kW (255 hp) at 5,000–6,500 rpm | 400 N⋅m (295 lb⋅ft) at 1,550–4,400 rpm | 2016– | |
| B48A20T1 | 225 kW (302 hp) at 5,000–6,250 rpm | 450 N⋅m (332 lb⋅ft) at 1,750–4,500 rpm | 2019– |
When combined with the electric motor, the 330e and 530e overall output is 185 kW (248 hp) and 420 N⋅m (310 lb⋅ft)[6] [7]
In the MINI Cooper S, a temporary overboost increases peak torque from 20 N⋅m (15 lb⋅ft) to 300 N⋅m (221 lb⋅ft).[8]
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.[13][14]
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