Audi RS4 B8 Piston With Connecting Rod 4.2 FSI CFSA Petrol R079C 07L198401D

Audi RS4 B8 Piston With Connecting Rod 4.2 FSI CFSA is an original component from the Pistons and rings group, designed for the 4.2 FSI petrol engine with the CFSA code. This piston and connecting rod assembly comes from a vehicle dismantling process, which allows for an economical yet technically sound repair of the power unit in Audi sports models.

Specifications and technical data

• SKU: 07L198401D-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 07L198401D
• Substitutable numbers: 07L198401D, 07L 198 401 D, R079C
• Fuel type: Petrol
• Part type: Piston
• Category: Pistons & Rings

Purpose and function in the 4.2 FSI CFSA engine

The presented piston-connecting rod assembly is a working component of the crank-piston system in an FSI petrol engine. It is responsible for converting the pressure of combustion gases into the rotational motion of the crankshaft, while maintaining the correct geometry and tightness of the combustion chamber. By maintaining factory design parameters, it ensures proper cooperation with the cylinder head, cylinder, and lubrication system in the CFSA unit.

Benefits of using an original Audi piston with connecting rod

Using an original piston-connecting rod assembly in a 4.2 FSI engine allows for maintaining the structural integrity of the power unit. In practice, this means:

• maintaining factory assembly clearances in the cylinder,
• proper cooperation with the stock crankshaft and piston pin,
• stable operation at high RPMs characteristic of RS versions,
• easier diagnostics and future service due to compliance with manufacturer documentation. For users expecting dynamic engine performance, it is important that the original Audi piston with connecting rod was designed for loads typical of a high-power unit, which promotes durability with proper operation and maintenance.

Application in repairs and overhauls of the power unit

The piston-connecting rod assembly is suitable for both local repair of a single cylinder and a more extensive overhaul of the 4.2 FSI CFSA engine. It can be used in situations such as:

• mechanical damage to the piston or connecting rod as a result of seizing or internal collision,
• excessive wear of the crank-piston system components,
• the need to restore uniform operation of all cylinders after an engine failure. Thanks to the preservation of the factory design, the element allows for the precise recreation of engine operating conditions, which is particularly important in high-revving petrol units.

Product characteristics and condition

The offered piston with connecting rod comes from an Audi vehicle dismantling, which allows for combining an attractive price with the preservation of the original manufacturer's specifications. The item is classified as used, which in practice means that standard workshop verification (checking clearances, mating surfaces, and potential metrological measurements) is recommended before installation, in accordance with service procedures for FSI petrol engines.

Integration with other components of the Audi piston-connecting rod system

When planning work on the CFSA unit, it is worth treating the crank-piston system as a whole. If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other components from the same group, such as pistons, rings, or connecting rods, check the available parts in the Audi pistons and rings category. For users interested in a broader approach to the economical operation of VAG group cars, including Audi and VW models, a practical guide on selecting parts from dismantling may be helpful – you can find it in the article VW cars: economically restoring full efficiency thanks to parts from professional dismantling, which discusses, among other things, when used components are a reasonable alternative to new elements from an authorized network.