BMW 1 3 Series E87 E90 E91 120i 320i Petrol N46 Engine Cylinder Head 7505422

BMW 1 3 Series E87 E90 E91 120i 320i Petrol N46 Engine Cylinder Head is a factory-original timing and combustion chamber component designed for N46 petrol engines in 1 and 3 Series models. By maintaining the original geometry of the intake and exhaust ports, it ensures stable engine performance and facilitates precise engine repairs. This is the ideal solution for users who expect consistency with BMW factory specifications and wish to restore proper engine operation.

Specifications and technical data

• SKU: 7581140
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7581140
• Substitutable numbers: 11127581140, 11127550540, 7550540, 7505422, KZ
• Fuel type: Petrol
• Category: Cylinder Heads

Purpose and compatibility

The presented cylinder head is dedicated to N46 petrol engines installed in BMW E87 120i and E90 320i models. The design corresponds to the factory solutions used by the manufacturer, which allows for maintaining proper compression, correct mixture flow, and seamless integration with engine peripherals.

By preserving the original architecture of the ports and valve seats, the cylinder head enables the restoration of correct engine parameters following a failure, overheating, or wear and tear. This is particularly important for modern petrol engines, where the precision of component fitment has a direct impact on performance and fuel consumption.

Technical characteristics and role in the engine system

The cylinder head in this BMW model is responsible for valve operation, combustion chamber formation, and the distribution of the air-fuel mixture and exhaust gases. In combination with the engine block, it creates a sealed working space where combustion processes occur. A properly selected cylinder head allows for maintaining the correct compression pressure, stable operating temperature, and proper cooperation with the ignition and fuel systems.

For petrol engines, it is particularly important to maintain the correct combustion chamber geometry, which affects engine smoothness, noise levels, and exhaust emissions. Using an original cylinder head from the BMW Cylinder Heads group minimizes the risk of fitment issues, leaks, or improper valve operation.

Benefits of using an original BMW cylinder head

Choosing this cylinder head for a BMW E87 and E90 provides a range of practical service and operational benefits:

• maintenance of factory engine performance parameters,
• easier diagnostics and service due to compliance with manufacturer documentation,
• consistency with original engine peripherals,
• reduced risk of issues with head gasket fitment and timing components.

For workshops and users, this means a more predictable repair process and the ability to restore the engine to stable, repeatable operation. The original BMW design also facilitates subsequent servicing and monitoring of the engine's condition.

Condition, verification, and use in repairs

The cylinder head is sourced from dismantling and is offered as a used component, which allows for significantly lower repair costs compared to new parts. This type of solution is often chosen for comprehensive petrol engine overhauls when it is necessary to replace the entire cylinder head casting rather than just refurbishing the existing unit.

Before installation, standard service procedures typical for petrol engine cylinder heads are recommended: checking the flatness of the mating surface, verifying valve seats and guides, and performing any necessary adjustments for the specific engine configuration. This approach allows you to fully utilize the potential of the part and ensure long-term, stable engine operation.

Expanding repairs within the engine system

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other items from the same group, such as cylinder head castings, valve covers, or other components related to the combustion chamber, check out the available parts in the BMW Cylinder Heads category.

To better choose a repair strategy and decide whether it is more cost-effective in your case to use original, aftermarket, or used parts, it is worth reading our practical guide: Original, aftermarket, or used – which car parts are the most cost-effective?.