CP Piston & Ring Set for Nissan RB25DET 6cyl-Bore (86.50mm)-Size (+0.5mm)-CR (9.0:1) (Set of 6)

This is a set of six forged pistons and rings from CP Pistons, specifically made for the Nissan RB25DET 6-cylinder engine. These pistons are designed to replace your stock ones with a bore size of 86.50mm, which is 0.5mm over the standard bore. They feature a compression ratio of 9.0:1, making them suitable for builds aiming for a balance between performance and reliability, especially with forced induction.

CP Pistons are well-known in the performance engine building world. These aren't just cast pistons; they are forged from high-strength aluminum alloy, which gives them a significant advantage in durability and resistance to detonation compared to stock cast pistons. This strength is crucial for engines that are modified for higher horsepower, such as those using turbochargers or superchargers. The 0.5mm overbore size is often used to clean up cylinder walls that have minor damage or wear, allowing you to achieve a fresh, perfectly round bore without going to a larger, less common size. The included rings are matched to the pistons and bore size to ensure proper sealing.

When rebuilding an RB25DET engine, especially for performance applications, choosing the right pistons is a critical step. This set from CP Pistons offers a well-built solution for those looking to refresh or upgrade their engine internals. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to your engine builder's specifications and the manufacturer's installation instructions for proper assembly and break-in procedures.