Description
Overview
The BMW N52B30 is a 3.0-liter naturally aspirated inline-six petrol engine, developed as part of the N52 engine family and fitted to the E90 330i. Known for its lightweight construction, modern engineering, and refined power delivery, the N52B30 replaced the M54 in 3 Series models and introduced several advancements in materials and performance. It features a plastic composite valve cover as part of BMW’s weight-saving design approach, alongside other innovations aimed at improving efficiency, responsiveness, and overall reliability in daily driving.
Key Features
3.0L Inline-Six Petrol Engine – Displacing 2,996 cc, the N52B30 delivers smooth, naturally aspirated power with responsive throttle behavior and refined high-RPM performance.
DOHC with 24 Valves – Dual overhead camshafts operate four valves per cylinder for efficient breathing and strong performance throughout the rev range.
Double VANOS & Valvetronic – Equipped with fully variable valve timing (VANOS) and variable valve lift (Valvetronic), this engine continuously adapts to driving conditions for optimal power and fuel economy.
Magnesium-Aluminum Alloy Block – The engine block is made from a lightweight magnesium-aluminum composite, reducing overall engine weight while maintaining strength.
Plastic Valve (Tappet) Cover – The N52B30 uses a molded plastic valve cover as standard, contributing to reduced weight and improved thermal insulation compared to traditional metal covers.
Electronic Throttle Control – Fully drive-by-wire throttle operation ensures smoother engine response and integration with the vehicle’s stability and efficiency systems.
Chain-Driven Valvetrain – A timing chain system drives both camshafts, minimizing long-term maintenance needs and enhancing reliability.
Performance & Applications
The N52B30 was used in various BMW models, with the E90 330i being one of the primary platforms for this engine.
BMW E90 330i (2005–2007) – The N52B30 was the factory engine for the E90 330i sedan, providing smooth and responsive naturally aspirated performance. It was also available in the E91 Touring, E92 Coupe, and E93 Convertible under the same 330i badge during this period.
Why Choose the BMW N52B30 Engine?
🔹 Refined Power Delivery – With no turbo lag and a smooth rev range, the N52B30 delivers a traditional BMW straight-six experience.
🔹 Lightweight Engine Design – The use of magnesium-aluminum and plastic components, including the valve cover, helps reduce weight for better handling and efficiency.
🔹 Proven Daily Reliability – With proper maintenance, the N52B30 offers consistent performance and has a strong reputation for long-term use.
🔹 Advanced Technology – The combination of Valvetronic and double VANOS ensures optimized fuel use and torque delivery across a wide RPM range.
🔹 OEM Fit for Multiple Models – As the standard engine in the E90 330i and other BMW 330 variants of the same era, the N52B30 has widespread parts availability and strong platform support.
Conclusion
The BMW N52B30 is a lightweight, naturally aspirated 3.0-liter inline-six petrol engine known for its smooth power, modern engineering, and advanced valvetrain technologies. Fitted with a plastic tappet (valve) cover from factory, the engine was designed with performance and efficiency in mind. Used in the E90 330i and related models, the N52B30 offers a strong blend of daily drivability, reliability, and the classic feel of a high-revving BMW straight-six.
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