BMW 3 Series E90 320si Engine N45 Inlet Camshaft 7552290

BMW 3 Series E90 320si Engine N45 Inlet Camshaft is an original timing system component designed for precise control of the intake valve timing phases. Thanks to its factory-fit for the N45 unit in the 320si model, it ensures engine consistency, stable operation, and predictable powertrain behavior. This is a solution for users who expect compatibility with factory specifications and want to maintain the performance characteristics of their BMW unit.

Specifications and technical data

• SKU: 7552290
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7552290
• Substitutable numbers: 11317552290, 7552290, ŁS
• Category: Other Engine Parts

Purpose and function in the N45 engine

The presented camshaft is responsible for controlling the intake valves in the four-cylinder N45 engine used in the BMW 3 Series E90 320si. Its cam profile has been designed for the specific characteristics of this unit, which allows for maintaining proper cylinder filling with the air-fuel mixture and preserving stock performance parameters.

By maintaining the original cam geometry, the camshaft supports:

• correct synchronization of valve operation with the crankshaft,
• stable idle speed,
• repeatable torque characteristics across the entire rev range,
• consistency with the factory engine control unit software.

Benefits of using an original camshaft

Using an original inlet camshaft in the N45 engine allows you to avoid problems typical of aftermarket replacements with imprecise geometry. This component is crucial for maintaining the proper operation of the timing system, which is why its selection has a direct impact on:

• smooth engine operation without unwanted vibrations,
• proper combustion and stable throttle response,
• reducing the risk of premature wear of tappets and valves,
• maintaining the stock performance characteristic of the 320si version.

For users who care about the technical correctness of the repair, it is important that the original inlet camshaft maintains compliance with BMW factory tolerances, which facilitates diagnostics and future service.

Component condition and service application

The offered camshaft is a secondary market component intended for service applications in BMW 3 Series E90 320si vehicles with the N45 unit. It is suitable for both standard replacement of a worn camshaft and repairs resulting from timing system damage.

In workshop practice, such a component is used, among others, for:

• repairs after lubrication system failure,
• damage to cams or camshaft bearings,
• comprehensive cylinder head rebuilds,
• restoring stock specifications after unsuccessful modifications.

For 320si owners, it is important that using the original camshaft profile allows for maintaining the characteristic power delivery of this engine version.

Integration with other timing system components

The inlet camshaft works with other cylinder head components, such as tappets, valves, valve springs, or timing phase control elements. Proper fitment of this component is important for:

• maintaining proper operating clearances in the valve train,
• even loading of the entire timing mechanism,
• reducing cylinder head operating noise,
• maintaining proper cooperation with the engine management system.

When replacing the camshaft, it is recommended to check the condition of mating components to fully utilize the potential of this part and avoid secondary damage.

If you are planning a comprehensive repair or upgrade of your BMW engine area and need other parts from the same group, such as exhaust camshafts, tappets, or timing control elements, check the available parts in the Other BMW category.

Additional technical information and service knowledge

When working with high-performance units, such as sports versions of mid-range models, it is particularly important to understand the influence of the camshaft on engine characteristics, oil selection, and service strategy. In the context of comparing different manufacturers' approaches to engine construction and drivetrain systems, it is worth reading the material discussing the differences between standard and sports versions – you can find it in the article Audi RS vs other models – what is hidden under the hood and chassis?, which allows for a better understanding of the importance of precision engine components in high-performance cars.