CP Piston & Ring Set for Audi/VW 1.8L 20 Valve - Bore (83.0mm) - Size (+2.0) - CR (8.5) - Set of 4

What you get in this box is a complete set of four forged pistons and their matching rings, specifically made for the Audi and Volkswagen 1.8L 20-valve engines. These aren't just stock replacements; they're built to handle more power and stress than original equipment. The pistons are 83.0mm in bore size, which is a +2.0mm overbore from stock, and they feature a compression ratio of 8.5:1. This setup is ideal if you're rebuilding or modifying your engine and need components that can stand up to increased performance demands.

CP Pistons is known for making strong, well-built internal engine components, and this set is no exception. Forged pistons, like these, start from a solid block of aluminum that's heated and hammered into shape. This process creates a much stronger and more durable piston than cast ones, making them less likely to fail under high cylinder pressures and temperatures. The 8.5:1 compression ratio is a notable change from stock, which typically means you'll be running more boost if you have a turbocharged engine, or you'll see improved torque if it's naturally aspirated. This specific set is sized at +2.0mm over the standard bore, which is useful for engines that have been previously bored or need a larger piston to restore compression and seal properly.

When you're installing these, remember they are an overbore size, so ensure your engine block has been properly machined to the correct 83.0mm dimension. This set includes the necessary rings to complete the piston assembly. Because these are performance-oriented components, it's always a good idea to consult with your engine builder or a trusted mechanic to ensure they are the right fit for your specific build goals and that all supporting modifications are in place for optimal performance and reliability.