Description
Overview
The BMW M54 2.2 engine, designated M54B22, is a naturally aspirated inline-six petrol engine developed for a refined balance of smooth performance, efficiency, and everyday reliability. Used across the E46 3 Series range, this 2.2-liter engine combines BMW’s signature straight-six layout with modern features like dual VANOS and an aluminum construction. It was designed to deliver consistent torque, smooth power delivery, and low maintenance for long-term usability in BMW’s mid-level executive segment.
Key Features
2.2L Inline-Six Naturally Aspirated Engine – The M54B22 features a 2.2-liter displacement and six-cylinder layout, delivering smooth, linear power without the need for turbocharging.
DOHC with 24 Valves – With dual overhead camshafts and four valves per cylinder, the engine ensures high breathing efficiency, contributing to refined performance and better fuel economy.
Dual VANOS – The M54B22 uses BMW’s dual VANOS system, adjusting both intake and exhaust cam timing to optimize torque and efficiency across the rev range.
Aluminum Block and Head – Built with an aluminum-silicon alloy block and an aluminum cylinder head, the engine is lightweight and offers improved heat management without sacrificing strength.
Electronic Throttle Control – The M54 was among BMW’s first engines to fully integrate electronic throttle control for improved responsiveness and drivability.
Chain-Driven Camshafts – The camshafts are driven by a timing chain, offering long service intervals and durability over time.
Performance & Applications
The M54B22 powered several models in the BMW E46 lineup, delivering a balance of comfort and performance.
BMW E46 320i (2000–2005) – The M54B22 engine was standard in the E46 320i sedan, touring, coupe, and convertible models, offering refined six-cylinder performance for everyday driving.
BMW E46 322i (2000–2005, limited markets) – In some regions, particularly for tax or registration classification purposes, the same engine was designated as the 322i with identical mechanical specifications to the 320i.
Why Choose the BMW M54 2.2 Engine?
🔹 Smooth Six-Cylinder Power – The naturally aspirated inline-six delivers smooth, predictable power with a distinct BMW character that’s refined and responsive.
🔹 Proven BMW Engineering – The M54B22 is part of a respected engine family known for its durability, offering a reliable powertrain with proper maintenance.
🔹 Efficient and Responsive – With dual VANOS and modern engine controls, the M54B22 offers strong mid-range torque while maintaining reasonable fuel efficiency.
🔹 Maintenance-Friendly Design – Featuring a timing chain and accessible engine layout, the M54 is relatively straightforward to maintain for an inline-six.
🔹 Factory Fitment in Popular Models – Used in a wide range of E46 320i variants and 322i (region-specific), this engine benefits from strong parts availability and support.
Conclusion
The BMW M54B22 2.2L engine is a refined, naturally aspirated inline-six that provides smooth power delivery and everyday usability in the E46 3 Series range. With dual VANOS, an aluminum construction, and proven reliability, the M54 2.2 remains a solid choice for drivers looking for a capable, well-balanced engine in BMW’s classic six-cylinder tradition. Whether in the 320i or region-specific 322i, this engine offers the kind of driving experience expected from BMW — smooth, responsive, and built to last.
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