| BMW B48 | |
| Manufacturer: | BMW |
| Production: | 2014–present |
| Predecessor: | BMW N20 |
| Configuration: | Inline-four |
| Displacement: | 15970NaN0 19980NaN0 |
| Bore: | 82mm |
| Stroke: | 75.6mm 94.6mm |
| Block: | Aluminium |
| Head: | Aluminium |
| Valvetrain: | DOHC, with VVT & VVL |
| Timing: | Chain |
| Compression: | 8.9:1 11:1 |
| Turbocharger: | Single twin-scroll with air-to-liquid intercooler |
| Fuelsystem: | Bosch HDEV5/HDEV5 EVO 200bar 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 350bar 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 |
| Fueltype: | Petrol |
| Oilsystem: | Wet sump with water heat exchanger |
| Coolingsystem: | Water-cooled |
| Power: | 115- |
| Torque: | NaN0NaN0 |
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,[1] which use a displacement of 5001NaN1 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 conrods and forged crankshaft is now 2.03lb 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 | 15970NaN0 | 1250NaN0 at 5,000–6,000 rpm | 2500NaN0 at 2,000–4,700 rpm | 2017– |
| B48B20 | 19980NaN0 | 1150NaN0 at 4,500–6,500 rpm | 2500NaN0 at 1,300–4,300 rpm | 2020– |
| B48A20U1 | 1310NaN0 at 5,000–5,500 rpm | 2800NaN0 at 1,350–4,200 rpm | ||
| B48B20M0 | 1350NaN0 at 5,000–6,500 rpm | 2700NaN0 at 1,350–4,600 rpm | 2016– | |
| 1350NaN0 at 5,000–6,500 rpm | 2900NaN0 at 1,350–4,250 rpm | |||
| B48A20M1 | 1410NaN0 at 5,000–6,500 rpm | 2800NaN0 at 1,250–4,600 rpm | 2014– | |
| 1410NaN0 at 4,700–6,000 rpm | 2800NaN0 at 1,250–4,750 rpm | |||
| 1410NaN0 at 5,000–6,000 rpm | 2800NaN0 at 1,350–4,600 rpm | |||
| 1950NaN0 at 5,000–6,000 rpm | 4000NaN0 at 1,350–4,600 rpm | |||
| B48B20M1 | 1450NaN0 at 4,500–6,600 rpm | 3200NaN0 at 1,450–4,200 rpm | 2019– | |
| B48B20O1 | 1650NaN0 at 5,000–6,500 rpm | 3100NaN0 at 1,400–5,000 rpm | 2016– | |
| B48A20O1 | 1700NaN0 at 5,000–6,000 rpm | 3500NaN0 at 1,250–4,500 rpm | 2015– | |
| 1700NaN0 at 5,200–6,200 rpm | 3000NaN0 at 1,250–4,800 rpm | |||
| 1700NaN0 at 5,000–6,000 rpm | 3500NaN0 at 1,450–4,500 rpm | |||
| B48O1ZIK | 1800NaN0 at 4,500–6,500 rpm | 4000NaN0 at 1,600–4,000 rpm | ||
| B48B20O0 | 1850NaN0 at 5,200–6,500 rpm | 3500NaN0 at 1,450–4,800 rpm | 2015– | |
| B48B20O1 | 1900NaN0 at 5,000–6,500 rpm | 4000NaN0 at 1,550–4,400 rpm | 2016– | |
| B48A20T1 | 2250NaN0 at 5,000–6,250 rpm | 4500NaN0 at 1,750–4,500 rpm | 2019– |
When combined with the electric motor, the 330e and 530e overall output is 1850NaN0 and 4200NaN0.[6] [7]
In the MINI Cooper S, a temporary overboost increases peak torque from 200NaN0 to 3000NaN0.[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]