BMW F87 F80 F82 F83 Engine Piston Connecting Rod 3.0 S55B30A 8089405

BMW F87 F80 F82 F83 Engine Piston Connecting Rod 3.0 S55B30A is an original component from the Pistons and rings group, designed for the S55B30A power unit used in BMW F-series sports models. The used OEM component ensures factory geometry, proper fitment, and maintenance of the standard operating parameters of the high-revving 3.0 engine.

Specifications and technical data

• SKU: 8089405
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8089405
• Substitutable numbers: 8089405, 11258089405, 7846333, 11257846333
• Part type: Piston
• Category: Pistons & Rings

Purpose and technical characteristics

The piston with connecting rod is a key element of the crank-piston system in the S55B30A engine, responsible for transferring combustion forces to the crankshaft. In BMW M F-series units, high dimensional stability, appropriate assembly weight, and precise balancing are required for the engine to operate safely across a wide RPM range.

The original BMW component from this group ensures:

• maintenance of standard assembly clearances in the cylinder,
• proper cooperation with factory piston rings,
• adequate connecting rod rigidity under dynamic loads,
• compatibility with the standard crankshaft and piston pin.

Benefits of using an original BMW piston with connecting rod

Using an original piston with connecting rod in the S55B30A engine allows for maintaining the factory operating parameters of the power unit. As a result:

• you reduce the risk of improper combustion and compression loss,
• you maintain stable engine operation under high load,
• you ensure proper cooperation with the standard lubrication system,
• you minimize the risk of vibrations resulting from differences in component weight.

For users who operate their BMW F87, F80, F82, or F83 in dynamic driving conditions, choosing an original element from the Pistons and rings group is a safe and technically justified solution.

Condition, verification, and practical application

The element comes from disassembly, which allows for an economical repair of the S55B30A unit while retaining OEM components. The used piston with connecting rod is particularly useful for:

• local repairs after damage to a single cylinder,
• partial overhauls when the remaining cylinders maintain correct parameters,
• restoring the engine to its standard specification after modifications.

Before installation, standard workshop inspection is recommended – measurement of diameter, ovality, pin clearance, and inspection of surfaces interacting with rings and bearings, in accordance with BMW service procedures.

Integration with the S55B30A engine system

The high-performance 3.0 S55B30A engine requires the crank-piston system components to be precisely tuned to each other. Using an original piston with connecting rod:

• facilitates maintaining an even load distribution between cylinders,
• supports the proper operation of the turbocharging and ignition control systems,
• reduces the risk of local overheating and excessive wear of the cylinder bore.

For workshops specializing in BMW M, this is a solution that allows maintaining consistency with factory technical documentation and repair procedures.

Repair expansion within BMW Pistons and rings

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 additional pistons, piston rings, or related connecting rods, check the available parts in the BMW Pistons and rings category.

Technical support and knowledge about BMW units

When planning an engine overhaul, it is worth using reliable sources of knowledge regarding common faults and methods of their removal in BMW units. For a better understanding of the specifics of repairs using original and used BMW components, you can read the article BMW N47 timing chain – typical failure and repair using original BMW parts, which discusses practical aspects of servicing modern engines of this brand.