Audi RS4 B8 Crankshaft Engine Crank Shaft 4.2 FSI CFSA 079105101CB

Audi RS4 B8 Crankshaft Engine Crank Shaft 4.2 FSI CFSA is a component from the Crankshafts group, designed for the high-revving 4.2 FSI petrol engine. The original Audi design ensures precise interaction with the CFSA engine block, which is crucial for the stable operation of the crank-piston system. Using an OEM component allows for a technically correct repair without interfering with the factory engine geometry.

Specifications and technical data

• SKU: 079105101CB
• Mark: Audi
• Condition: Used
• OEM Part Number: 079105101CB
• Substitutable numbers: 079105101CB, 079 105 101 CB
• Category: Crankshafts

Purpose and technical characteristics

The presented crankshaft has been designed specifically for the 4.2 FSI CFSA engine mounted in the Audi RS4 B8, where it operates under conditions of high mechanical and thermal stress. It is responsible for converting the reciprocating motion of the pistons into rotational motion, which is why its geometry, balance, and rigidity are critical to the engine's performance and smoothness. Thanks to the factory Audi specification, proper cooperation with the bearings, connecting rods, and flywheel is maintained, which limits torsional vibrations and reduces the risk of unwanted resonances at high RPMs. Original construction helps maintain factory performance parameters and the correct operation of the lubrication system.

Benefits of using an original crankshaft

Using a factory crankshaft in an Audi RS4 B8 with a 4.2 FSI CFSA engine allows for maintaining the assembly tolerances and operating characteristics designed by the manufacturer. In practice, this means:

• stable engine operation across the entire RPM range,
• proper balancing of the crank-piston system,
• better compatibility with the stock lubrication and oil cooling system,
• reduced risk of premature wear of bearings and connecting rods. For users who drive their RS4 B8 dynamically, maintaining the original crankshaft specification is particularly important from the point of view of durability and performance consistency. The OEM component minimizes the risk of problems resulting from imprecise aftermarket replacements.

Condition of the component and assembly aspects

The crankshaft is offered as a pre-owned aftermarket part, which allows for an economical engine repair while maintaining the factory design. Before installation, a standard workshop procedure is recommended, including verification of journal surfaces, runout inspection, and matching with new bearings in accordance with Audi service documentation. For proper installation, it is crucial to maintain the correct tightening torques for the connecting rod and flywheel bolts, as well as to thoroughly clean the oil channels. Professional installation at a specialized service center significantly reduces the risk of failure after engine overhaul.

Application in service and tuning

The crankshaft from the Audi RS4 B8 4.2 FSI CFSA is suitable for both standard engine rebuilds and projects where the stock engine specification is maintained. In the case of light intake or exhaust system modifications, the original crankshaft remains the right choice, ensuring predictable engine behavior. For workshops specializing in the Audi brand, such a component is a valuable base for comprehensive repair of CFSA units, allowing for the restoration of factory operating parameters without the need for uncertain replacement solutions.

Expanding the scope of repairs – Audi crankshafts

If you are planning a comprehensive repair or upgrade of your Audi engine area and need other components from the same group, such as other shafts, connecting rods, or parts interacting with the crank system, check out the available parts in the Audi crankshafts category. To compare manufacturers' approaches to high-performance components and the use of used parts in sports and performance cars, it is worth reading the article BMW M Performance: how do BMW M components differ from standard ones?, which discusses design and operational differences in the premium segment.