CP Piston & Ring Set for Acura/Honda K20A/A2/A3 - Bore (87mm) - Size (+1.0mm) - CR (9.0:1)

This is a set of four forged pistons and matching rings from CP Pistons, specifically made for the 2002-2006 Acura RSX with K20A, K20A2, or K20A3 engines. These pistons are 87mm in bore diameter and are 1.0mm oversize, meaning they are intended for an engine block that has been bored out to accommodate them during a rebuild. The compression ratio achieved with these pistons is 9.0:1, which is a common target for naturally aspirated or mild forced induction builds.

CP Pistons are well-known in the performance engine building community for their strong construction and precise manufacturing. These are forged pistons, which means they start as a solid block of aluminum that is heated and hammered into shape under extreme pressure. This process creates a much stronger and more durable piston than cast aluminum, making them ideal for engines that will see higher performance demands or increased boost pressure. The included rings are designed to seal against the cylinder walls and the piston, ensuring proper compression and oil control. This set is a critical component for anyone looking to rebuild or significantly upgrade their K-series engine.

When rebuilding an engine, it's important to ensure your cylinder block has been properly machined to the correct bore size for these 1.0mm oversize pistons. You'll also want to confirm that all other necessary components for your engine build are on hand, such as bearings, gaskets, and potentially an oil pump upgrade, depending on your specific build goals. Please note that this part is not CARB approved and cannot be shipped to California.