CP Piston & Ring Set for Nissan RB25DET 6cyl-Bore (86.0mm)-Size (STD)-CR (9:1) (Set of 6)

CP Pistons is well-known for building high-performance forged pistons for demanding engine builds. This set is specifically for the Nissan RB25DET engine, offering a standard bore size of 86.0mm and a compression ratio of 9:1. This is a complete set of six pistons and rings, ready to be installed in your RB25DET.

These pistons are forged, which means they start as a solid block of aluminum that is heated and then 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 use or boosted applications. The 9:1 compression ratio is a good balance for many RB25DET builds, offering a solid increase in power potential while still being manageable with pump gas in many setups. The standard bore size means these are a direct replacement for stock-sized pistons, simplifying the machining process for your engine builder.

When rebuilding your RB25DET, using a well-built forged piston set like this from CP Pistons is a critical step towards achieving reliable performance. Remember that these pistons are not CARB approved and cannot be shipped to California. Always refer to your engine builder's recommendations and the manufacturer's installation instructions for proper assembly and break-in procedures.