The 4-cylinder N20B20 turbo engine began to be installed on BMW cars in 2011. The engine replaced the N53B25 and N53B30 units. The block of the new motor is made of aluminum alloy and contains two balance shafts. Steel-coated engine cylinders, forged crankshaft with four offset counterweights, 144.35mm long cranks.
The cylinder head of the engine is similar to the N55, with composite camshafts and TVDI direct fuel injection, contains the Valvetronic 3 and Double-Vanos system.
Specifications
| Production years | 2011-2018 |
| Displacement, cc | 1997 |
| Fuel system | direct injection |
| Power output, hp | 156/5000 184/5000 218/5500 245/5000 |
| Torque output, Nm | 240 270 310 350 |
| Cylinder block | aluminum R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 84 |
| Piston stroke, mm | 90.1 |
| Compression ratio | 10 – 11 |
| Features | Valvetronic III |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | double VANOS |
| Turbocharging | twin-scroll |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 5.0 |
| Fuel type | petrol |
| Euro standards | EURO 5/6 |
| Fuel consumption, L/100 km (for 320i F30) — city — highway — combined |
8.8 5.6 6.8 |
| Engine lifespan, km | ~220 000 |
Disadvantages of the N20B20 engine
Malfunctions in the BMW N20B20 engine are the appearance of vibrations, increased fuel consumption and floating speed.
- The main cause of unit vibrations is dirty injectors. In most cases, the problem is resolved quickly.
- If the speed is floating, the condition of the idle valve and throttle valve should be inspected – they can become very dirty and cause a malfunction in the operation of the power unit.
- When there is an increase in fuel consumption, the problem may be hidden in a malfunction of the air mass meter. This is one of the main reasons to be ruled out in the first place.
It should be borne in mind that when operating the BMW N20B20 engine, it is better not to save on working fluids. It is advisable to fill up with high-quality gasoline and oil recommended by BMW. With regular diagnostics and maintenance, the BMW N20B20 engine will work reliably.
