BMW F10 LCI F11 F20 F21 F30 LCI N55 Petrol Fuel Injector Injection Set 7639994

BMW F10 LCI F11 F20 F21 F30 LCI N55 Injector Set 7639994 is a complete set of gasoline injector nozzles designed for the N55 engine in select BMW F-series models. This part is suitable for users seeking a factory solution for the fuel system, ensuring stable engine operation and correct fuel dosage.

Specifications and technical data

• SKU: 7639994-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7639994
• Substitutable numbers: 7639994, 13647639994, 0261500172, 0 261 500 172
• Fuel type: Petrol
• Category: Fuel Injectors

Technical Characteristics of BMW N55 Injector Nozzles

The presented set belongs to the category of injector nozzles and is designed for the N55 gasoline engine used in BMW F10 LCI, F11, F20, F21, and F30 LCI models. The injector design is adapted to the requirements of modern turbocharged units, where precise fuel metering under variable load and high operating pressure is crucial.

The injection system in the N55 engine is responsible for:

• precise gasoline atomization in the combustion chamber, promoting smooth engine operation,
• maintaining stable combustion parameters across the entire RPM range,
• reducing fuel consumption while preserving adequate dynamics,
• lowering exhaust emissions due to the correct fuel spray pattern.

Purpose and Application in BMW F-Series Models

The injector set is dedicated to the N55 unit fitted in popular BMW 3 Series, 5 Series, and 1 Series F-generation models. This makes it a solution for users who:

• are upgrading or servicing the gasoline fuel system in their BMW,
• are looking for a set tailored to the specific requirements of the N55 engine,
• want to restore proper engine operation after experiencing fuel delivery issues.

Properly selected injector nozzles help eliminate common wear symptoms such as rough idling, power loss, or increased fuel consumption, provided correct diagnosis and installation.

Benefits of Using a Complete Injector Set

Using a complete injector set in the N55 gasoline engine ensures consistent operation of all cylinders and facilitates subsequent engine control unit calibration. The main advantages of this solution include:

• uniform operating characteristics of all injectors within a single engine,
• increased fuel delivery repeatability between cylinders,
• easier diagnosis of potential fuel system faults in the future,
• reduced risk of discrepancies arising from mixing components with different wear levels.

For turbocharged units like the N55, consistency in injection parameters directly impacts engine operational safety, especially under higher loads and during dynamic driving.

Condition, Origin, and Installation Aspects

The offered set of BMW injector nozzles comes from the BMW OE parts group, meaning it retains factory spray geometry and compatibility with original engine equipment. The item is classified as used, so before installation, a standard service procedure is recommended, including checks for leaks, cleanliness, and performance parameters on a diagnostic bench.

When installing, pay attention to:

• correct seating in the cylinder head, adhering to torque specifications,
• using new seals compliant with manufacturer requirements,
• injector adaptation in the engine control unit, if the service procedure for the specific model requires it.

Diagnostics and Technical Knowledge of Injectors

Although this set is for a gasoline engine, the principles of diagnostics and symptoms of injector malfunction are in many aspects similar to those of diesel high-pressure systems. To expand your knowledge on typical injection system faults, it is worth familiarizing yourself with material describing symptoms and consequences of neglect – you can find it in the article diesel injector faults – symptoms and consequences of neglect, which helps to better understand the importance of regular diagnostics.

Other BMW Injector Nozzles and Used Parts Tuning

If you are looking for other BMW injector nozzles for different models or engine configurations, check out our dedicated category: BMW injector nozzles, where you will find a wide selection of parts for various engines of this brand.

For upgrade and modification projects, it is also worth considering the use of proven parts from the aftermarket. More information on this topic can be found in the guide best used parts for tuning your car, which discusses a practical approach to selecting used components for tuning projects.