Mini Cabrio F57 BMW F20 F21 F22 F23 F30 F31 Piston B36 B38 B48 Engine 9468871

Mini Cabrio F57 BMW F20 F21 F22 F23 F30 F31 Piston B36 B38 B48 is an original component from the Pistons and rings category, designed for professional engine repairs in Mini and BMW vehicles. Thanks to its factory origin, it ensures a precise fit within the combustion chamber and proper interaction with the crankshaft-piston system, which translates into stable engine performance. This is a solution for users who expect proven quality and want to maintain engine operating parameters in accordance with the manufacturer's specifications.

Specifications and technical data

• SKU: 9468871
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 9468871
• Substitutable numbers: 11 25 9468871, 11259468871, 9468871, 11 25 8638448, 11258638448, 8638448, 11 25 8618502, 11258618502, 8618502, 11 25 8657760, 11258657760, 8657760, 11 25 8623260, 11258623260, 8623260, 11 25 8632624, 11258632624, 8632624, 11 25 2462155, 11252462155, 2462155
• Part type: Piston
• Category: Pistons & Rings

Purpose and compatibility

The presented piston is dedicated to the B36, B38, and B48 engine families used in Mini Cabrio F57 models and selected BMW F20, F21, F22, F23, F30, and F31 series models. The component's design is optimized for the characteristics of these units, which allows for maintaining proper compression pressure, correct piston-ring-cylinder geometry, and appropriate engine refinement across the full load range. Selecting a piston compatible with the specific engine version is crucial for the durability of the power unit, which is why using an original Mini component helps reduce the risk of improper fitment, excessive oil consumption, or power loss. This is particularly important when repairing turbocharged engines, where thermal and mechanical loads are significantly higher.

Construction and performance parameters

The piston is designed to work with properly selected piston rings, creating a tight and stable combustion chamber sealing system. The shape of the piston crown, the arrangement of the ring grooves, and the geometry of the gudgeon pin are adapted to the specific requirements of B36, B38, and B48 engines, which enables the maintenance of proper mixture flow, effective heat dissipation, and control over engine knocking. Original manufacturing ensures that the required dimensional tolerances are met, which translates into even cylinder loading, reduced operating noise, and stable oil pressure in the lubrication zone. As a result, the piston can be safely used both in standard city driving and more dynamic conditions, provided that the assembly and selection of other crankshaft-piston system components are performed correctly.

Component condition and service application

The offered Mini piston comes from disassembly and is intended for service applications as a spare part in professional workshops and for repairs performed independently by experienced users. The used component allows for an economical engine rebuild while maintaining the original manufacturer's specifications, which is particularly beneficial in the case of complex engine repairs. Before installation, a standard workshop inspection procedure is recommended, including verification of assembly clearances, the condition of mating surfaces, and matching to the specific cylinder and connecting rod pin. A correctly selected and installed piston allows the engine to regain stable operating parameters, reduce oil consumption, and improve compression in the repaired unit.

Benefits of using an original Mini piston

Using an original piston in B36, B38, and B48 engines provides several significant operational benefits:

• preservation of the factory operating characteristics of the power unit,
• material and structural consistency with other components of the crankshaft-piston system,
• reduction of the risk of improper fitment compared to aftermarket replacements of unknown origin,
• possibility of precise matching during the repair of a single cylinder or the entire set. For users who want to keep the engine in a configuration consistent with the manufacturer's design, choosing an original piston is a technically safe and predictable solution in terms of durability.

Related components and additional information

If you are planning a comprehensive repair or upgrade of the engine area in your Mini and need other elements from the same group, such as pistons, rings, or related components, check the available parts in the Mini Pistons and rings category. If you are simultaneously working on the steering system or want to better understand the relationships between individual vehicle subassemblies, the guide article on the construction and diagnostics of the steering and power steering system may be helpful, as it facilitates the planning of broader service work.