BMW 2.0 N46-B20 ENGINE

The BMW N46-B20 is a naturally aspirated, $2.0$-liter Inline-Four gasoline engine produced from 2004 to 2015, belonging to BMW’s N46 family.

Key Features

• Technology: It is a $\text{DOHC}$ (Dual Overhead Camshaft) engine known for featuring BMW’s Valvetronic (variable valve lift) and Double VANOS (variable valve timing) systems. These technologies are crucial for optimizing fuel efficiency and power delivery across the rev range without needing a traditional throttle body.
• Performance: The engine displacement is $1,995\text{ cc}$. In its most common tune (like the N46B20O1 for the $320\text{i}$), it typically produced around $150\text{ hp}$ ($110\text{ kW}$) and $200\text{ Nm}$ of torque.
• Application: It was widely used in BMW’s entry-level models, including the E87 1-Series, E90 3-Series ($318\text{i}/320\text{i}$), and the E83 X3, serving as the standard four-cylinder petrol option in many global markets.
• Reputation: The N46 is known for being a reliable, naturally aspirated engine, but requires diligent maintenance, particularly concerning its Valvetronic system and oil management.