Overview
The BMW N52B30 is a 3.0-liter inline-six petrol engine built for refined performance and modern efficiency. Introduced with the E90 330i, this naturally aspirated engine marked a significant evolution from its predecessor, using lightweight materials and advanced technology to improve responsiveness and reduce weight. The engine comes standard with a factory-installed plastic valve (tappet) cover, part of BMW’s push for weight savings and thermal efficiency.
Key Features
3.0L Inline-Six Engine – The N52B30 has a displacement of 2,996 cc and delivers smooth, consistent power throughout the rev range with classic straight-six balance.
Dual Overhead Camshafts (DOHC), 24 Valves – With four valves per cylinder, the engine breathes efficiently for strong mid-range torque and high-RPM power.
Double VANOS & Valvetronic – The engine uses fully variable valve timing on both camshafts (VANOS) and variable valve lift (Valvetronic) for improved throttle response and optimized fuel economy.
Magnesium-Aluminum Alloy Engine Block – A magnesium outer shell combined with an aluminum inner crankcase significantly reduces engine weight while maintaining structural strength.
Plastic Valve Cover – From factory, the N52B30 is equipped with a molded plastic tappet cover, contributing to reduced engine weight and improved thermal management over traditional metal covers.
Electronic Throttle System – The engine is managed via drive-by-wire throttle control for smooth input response and integrated control with other vehicle systems.
Timing Chain Drive – A chain-driven system eliminates the need for timing belt service and enhances long-term reliability.
Performance & Applications
The N52B30 powered several BMW models, including multiple body styles in the 330i lineup.
BMW E90 330i (2005–2007) – This engine was the standard powerplant for the E90 330i sedan during the pre-LCI model years.
Also found in:
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E91 330i Touring
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E92 330i Coupe
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E93 330i Convertible
All models used the same base engine with identical specifications.
Why Choose the BMW N52B30 Engine?
🔹 Smooth, Naturally Aspirated Power – Delivers consistent and responsive performance without the complexity of forced induction.
🔹 Lightweight Construction – Use of magnesium alloy and a plastic valve cover helps lower overall engine weight for better handling and efficiency.
🔹 Reliable Straight-Six Performance – With regular maintenance, the N52B30 is known for long service life and dependable operation.
🔹 Advanced Variable Valve Technology – Valvetronic and double VANOS systems adjust engine output in real-time for optimal power and efficiency.
🔹 Direct OEM Fit – This engine is the correct standard fitment for the E90 330i and its sister models, with wide parts support and service availability.
Conclusion
The BMW N52B30 3.0L engine is a lightweight, naturally aspirated inline-six known for its smooth power delivery and modern engineering. Designed with a factory plastic valve cover and magnesium-aluminum block, the engine prioritizes efficiency and performance. As the standard engine in the E90 330i, the N52B30 continues to offer a strong blend of refinement, durability, and classic BMW driving character.
