BMW E90 E91 E92 E93 LCI Flow Meter Hot Film Air Mass Pipe Diesel N47N 8506409

The BMW E90 E91 E92 E93 LCI Diesel Air Mass Meter N47N is an intake system component from the intake manifolds category, designed for post-facelift BMW 3 Series diesel engines. It enables precise measurement of the amount of air drawn in, which translates to stable engine operation and the correct fuel dosage in a diesel engine. This is a solution for users seeking a proven component with factory performance characteristics.

Specifications and technical data

• SKU: 8506409
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8506409
• Substitutable numbers: 13628506409, 8506409, 0281006093
• Fuel type: Diesel
• Category: Intake Manifolds

Application in N47N Diesel Engines

The air mass meter works with the engine control unit, providing information about the amount of air drawn in by the intake system. For a Diesel engine, this is crucial for:

• maintaining the correct fuel dose across the entire RPM range,
• stable idle and under load operation,
• reducing smoke and power loss,
• proper cooperation with the turbocharger and exhaust gas recirculation system.

Thanks to accurate air mass measurement, the control unit can precisely manage the combustion process, which helps maintain the factory operating parameters of the N47N engine.

Technical Characteristics and Integration with the Intake System

The offered air mass meter is designed for installation in the intake system within the intake manifold, where it measures the airflow directed to the cylinders. The component's design is adapted to the operating conditions in a diesel engine – it accounts for variable boost pressure, airflow pulsations, and elevated intake air temperature.

The component is designed to:

• provide a stable signal for the engine control unit across a wide range of loads,
• minimize measurement interference caused by turbulence in the intake duct,
• maintain proper sealing of the connection with the intake pipes.

Benefits of Using an Original BMW Air Mass Meter

Choosing an air mass meter dedicated to the BMW E90, E91, E92, E93 LCI series helps maintain consistency with the vehicle's factory configuration. Proper integration with the intake system and engine control unit translates to:

• accurate throttle response and predictable power delivery,
• improved engine smoothness in typical driving conditions,
• reduced risk of control unit errors related to incorrect air measurement,
• maintaining fuel consumption parameters close to the manufacturer's factory specifications.

This is particularly important in modern diesel engines where the intake system, intake manifold, and air mass meter form a tightly integrated system.

Product Condition and Service Purpose

The air mass meter is offered as a used part, which is a cost-effective solution for users seeking a component with factory characteristics at a reasonable price. This type of component is suitable for both routine replacement and diagnosing engine performance issues such as power loss or unstable idling.

Due to its specific function in a diesel engine, it is recommended to install it in a vehicle where the intake system and intake manifold are in good technical condition, allowing for the full utilization of the air mass meter's capabilities.

Related Manifolds and Technical Knowledge

If you are looking for other BMW intake manifolds for your 3 Series or related models, check out our dedicated category: BMW intake manifolds. You will find a wide selection of intake components tailored to various engine versions.

Want to better understand the relationships between airflow, the manifold, and the rest of the system? Read the article on our blog, where we discuss practical aspects of selecting and operating intake and exhaust components: Performance Exhaust System: Used Manifolds and Sport Catalytic Converters on the Road. This is valuable supplementary knowledge when planning more extensive modifications or repairs.