Overview
The BMW N55B30A 3.0L engine, when supplied without its factory turbocharger, serves as a high-quality base power unit for rebuilds, performance projects, or replacement use. Originally designed as a turbocharged inline-six, the N55B30A features a solid aluminum block, DOHC valvetrain, and BMW’s latest advancements in variable valve timing and fuel management. Even without the turbo component, this engine maintains its reputation for smooth operation, precision engineering, and strong performance potential. Ideal for engine swaps, performance upgrades, or custom builds, the N55B30A remains one of BMW’s most versatile straight-six platforms.
Key Features
3.0L Inline-Six Engine Block – At the heart of the N55B30A is a 3.0-liter inline-six with an aluminum crankcase and cast-iron cylinder liners. Known for its balance and smooth operation, this configuration delivers responsive power and engine longevity.
DOHC with Valvetronic and Dual VANOS – The engine is equipped with double overhead camshafts, BMW’s Valvetronic variable valve lift system, and dual VANOS camshaft timing. These technologies improve engine efficiency, throttle response, and power across the rev range—even without forced induction.
Turbocharger Not Included – This listing provides the complete N55B30A long block minus the turbocharger and related components, making it a flexible option for enthusiasts looking to build a naturally aspirated setup or install their own forced induction system.
Direct Fuel Injection System – High-precision direct injection allows for cleaner, more efficient fuel combustion, which is beneficial whether the engine is used in stock form or modified.
Aluminum Construction – Lightweight materials reduce engine mass and improve thermal efficiency, helping the engine maintain operating temperatures more effectively under load.
Performance & Applications
The N55B30A engine was widely used across BMW’s performance and luxury models. While it is typically turbocharged in production form, the engine’s naturally aspirated variant or turbo-deleted version is popular in custom and performance applications.
BMW 3 Series F30/F32/F34 (335i/435i, 2011–2016) – This engine served as the foundation for performance variants in the 3 and 4 Series range. Removing the turbo provides a blank canvas for custom naturally aspirated builds or bespoke turbo kits.
BMW 5 Series F10 (535i, 2010–2016) – Also found in the larger 5 Series, the N55B30A offers a strong platform for high-performance luxury builds or replacement use.
BMW X Series (X3, X5, X6, Various Years) – In SUV applications, this engine delivers durability and refinement. Without the turbo, it becomes a solid candidate for tuning or repurposing in other chassis types.
Why Choose the BMW N55B30A Engine (No Turbo)?
🔹 Strong Engine Architecture – The N55 is built on a robust inline-six foundation, known for its inherent balance, reliability, and smooth operation.
🔹 Ideal for Custom Builds – Without the stock turbocharger, this engine is perfect for those looking to create a custom NA setup or fit an aftermarket turbo system.
🔹 Advanced BMW Technology – Features like Valvetronic and direct injection remain active even without the turbo, supporting strong naturally aspirated performance.
🔹 Versatile Fitment – Compatible with a wide range of BMW models, this engine block and head combination is ideal for swaps, rebuilds, or high-performance conversions.
🔹 Engineered for Performance – Even in non-boosted form, the N55 maintains excellent airflow, strong internals, and a high-revving nature.
Conclusion
The BMW N55B30A 3.0L engine (without turbocharger) offers a highly capable platform for performance builders, tuners, and enthusiasts alike. Its naturally aspirated configuration delivers reliable power and a clean slate for modifications or custom setups. Whether you’re planning a high-revving NA build, sourcing a replacement for a damaged motor, or preparing for a bespoke turbo project, the N55B30A remains one of BMW’s most adaptable and respected engine choices. Built with precision and advanced engineering, it continues to deliver performance, flexibility, and the unmistakable character of a BMW inline-six.
