After the inline four N42B20, BMW began producing a motor with the N46 index, its two-liter modification was named N46B20. It is based on the N42B20 engine, and it seems that the new motor does not differ from the old one at all, but this is only at first glance. In the BMW N46B20 engine, the volume was increased to 2.0 L (1995 cc). Different versions of the engine have different power from 129 to 170 horsepower on average at 6000 rpm, the torque is also different and is 180 or 200 Nm at 3750 rpm.
Specifications
| Manufacturer | BMW Plant Hams Hall |
| Also called | N46 |
| Production years | 2004-2012 |
| Cylinder block alloy | aluminum |
| Fuel system | injector |
| Configuration | inline |
| Number of cylinders | 4 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 90 |
| Cylinder bore, mm | 84 |
| Compression ratio | 10.5 |
| Displacement, cc | 1995 |
| Power output, hp | 129/5750 136/5750 143/6000 150/6200 170/6400 |
| Torque output, Nm / rpm | 180/3250 180/3250 200/3750 200/3600 210/4100 |
| Fuel type | 95 |
| Euro standards | Euro 4-5 |
| Weight, kg | — |
| Fuel consumption, L/100 km (for 320i E90) — city — highway — combined |
10.7 5.6 7.4 |
| Oil consumption, gr/1000 km | up to 700 |
| Recommended engine oil | 5W-30 / 5W-40 |
| Engine oil capacity, liter | 4.25 |
| Amount of engine oil for replacement, liter | 4 |
| Oil change interval, km | 10000 |
| Normal engine operating temperature, °C | — |
| Engine lifespan, km — official information — real |
— 250+ |
Frequent problems
- Excessive consumption of engine oil. As with the N42 series, the main reason is the destruction of the valve stem seals due to prolonged filling of low-quality oil. The oil scraper rings also suffer from this. Both components need to be replaced after 50 thousand kilometers. Bad oil can easily damage the Vanos and Valvetronic systems, KVKG and the oil pump.
- Motor jitter. The system for changing the valve timing is clogged – Vanos. Cleaning required.
- The appearance of noise and diesel effect. The same reasons as on the N42 version are a loosening of the timing chain or a breakdown of its tensioner. Such ailments appear already after passing 100 thousand kilometers.
Fifty thousand kilometers of run can be marked by leaking valve cover gaskets and vacuum pump. To avoid most of the engine malfunctions and to make it work harmoniously, like a good clockwork, you can, if you constantly monitor its condition, undergo maintenance on time and fill it with only good oils and fuel.
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