In 2006, the N45 engine received a new modification – N45B20S with a displacement of 1997 cc. The updated inline 4-cylinder engine differs from its predecessor in terms of power – 126 kW (173 hp). In addition to improving technical characteristics, the main technological improvement of the engine was undoubtedly the use of the innovative Valvetronic system, which significantly increases the efficiency of the entire engine as a whole.
Specifications
| Manufacturer | BMW Plant Hams Hall |
| Also called | N45 |
| Production years | 2006-2007 |
| Cylinder block alloy | aluminum |
| Fuel system | injector |
| Configuration | inline |
| Number of cylinders | 4 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 88 |
| Cylinder bore, mm | 85 |
| Compression ratio | 11 |
| Displacement, cc | 1997 |
| Power output, hp | 177/7000 |
| Torque output, Nm / rpm | 210/4250 |
| Fuel type | 95 |
| Euro standards | Euro 4-5 |
| Weight, kg | — |
| Fuel consumption, L/100 km (for 320si E90) — city — highway — combined |
12.8 6.6 8.9 |
| Oil consumption, gr/1000 km | up to 700 |
| Recommended engine oil | 5W-30 / 5W-40 |
| Engine oil capacity, liter | 4.5 |
| Oil change interval, km | 10000 |
| Normal engine operating temperature, °C | — |
| Engine lifespan, km — official information — real |
— 250+ |
Frequent problems
- Knocks inside the motor. The main reason for this, as a rule, is a damaged timing chain tensioner. Moreover, the latter often quickly relax and become unusable after 100 thousand km of run.
- Vibrates at idle speed. In this case, the most common cause is the Vanos system. It is cleaned as a repair measure.
Units of the N45 series also have another obvious drawback – the detonation of the fuel mixture. The problem arises from poor quality fuel or oil. The BMW manufacturer strongly discourages the use of any alternative engine oil, since the consequences can be very serious – it may be necessary to carry out major repairs to restore it.
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