BMW 3 Series E90 E91 Diesel N47 Engine Air Intake Suction Duct Hood 7798772

BMW 3 Series E90 E91 Diesel N47 Engine Air Intake Suction Duct Hood is a factory-original component of the air supply system for diesel engines, designed for facelifted 3 Series models. It is responsible for the stable delivery of air to the power unit, which promotes smooth engine operation and proper interaction with the forced induction system. By maintaining the original geometry of the intake duct, this component helps preserve correct flow parameters and minimize pressure drops in the system.

Specifications and technical data

• SKU: 7798772-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7798772
• Substitutable numbers: 13717798772, 7798772, 13717811906, 7811906, EM
• Fuel type: Diesel
• Category: Other Engine Parts

Purpose and function of the air intake duct

The air intake duct in the version dedicated to the N47 engine in the BMW E90 LCI is responsible for directing air from the intake system to subsequent intake components. In diesel-powered units, proper airflow has a direct impact on the combustion process, engine refinement, and throttle response. Using an original component with the correct shape and cross-section helps reduce turbulence, thereby decreasing the risk of power loss or rough idling.

Replacing the intake duct is particularly important in cases of mechanical damage, cracks, or leaks, which can cause the intake of unfiltered air or lead to sensor reading errors. Using a properly selected component allows for the restoration of the intake system's integrity and stability.

Technical characteristics and compatibility

The presented air intake duct is part of the original BMW components group, which means it maintains factory mounting dimensions and complies with the airflow path intended by the manufacturer. As a result, the component works seamlessly with the stock air filter housing, hoses, and other intake system parts in vehicles equipped with a diesel engine.

The original design of the intake duct ensures:

• a properly selected diameter and cross-sectional shape for the N47 engine,
• stable airflow guidance towards the intake manifold,
• direct installation in the designated mounting points within the engine bay.

By maintaining factory specifications, the duct works in harmony with the stock engine control unit software, without the need for changes to maps or adaptations resulting from intake modifications.

Component condition and installation aspects

The offered air intake duct is a used component, which in practice means it has been removed from a vehicle and verified for further serviceability. This type of part is a good choice when the priority is to maintain the original design while optimizing repair costs. A used intake duct, provided there is no structural damage, performs its function in a manner similar to a new equivalent.

During installation, it is worth paying attention to:

• proper seating in the slots and brackets within the engine bay,
• thorough tightening of connections with adjacent hoses and the filter housing,
• checking the condition of seals and clamps to avoid leaks in the intake system.

A correctly installed intake duct helps maintain stable engine operating parameters, especially during startup, acceleration, and operation under load.

Benefits of using an original air intake duct

Using an original air intake duct in a BMW E90 LCI with an N47 engine provides a number of practical benefits. Above all, compliance with the factory design is maintained, which reduces the risk of installation problems and unwanted changes in airflow characteristics. Compared to aftermarket replacements of uncertain origin, the original component ensures predictable intake system behavior and better repeatability of parameters.

The most important advantages include:

• maintaining the correct air balance in the diesel engine,
• reducing the risk of errors related to intake leaks,
• easier diagnostics in the future thanks to the use of parts consistent with service documentation.

An intake duct selected in this way is a reasonable solution both for standard repairs and for restoring a vehicle to a near-factory configuration after previous modifications.

Additional information and related products

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as intake hoses, air filter housings, or additional air guide ducts, check out the available parts in the Other BMW category.

When working on the powertrain and analyzing design differences between specific model versions, it is worth expanding your knowledge about solutions used by manufacturers. A good point of reference may be an article describing the sports variants of another brand, which discusses engines, brakes, and chassis, among other things – you can find it here: Audi RS vs other models – what is hidden under the hood and chassis?.