CP Piston & Ring Set for Nissan RB25DET - Bore (87.0mm) - Size (+1.0mm) - Compression Ratio (8.5)

If you're rebuilding the engine in your Nissan RB25DET, especially if you're aiming for more power or need to refresh worn cylinders, a solid set of pistons is crucial. This set from CP Pistons is built for performance applications, offering a robust solution for your engine build. These are forged pistons, which means they start as a single block of aluminum that's heated and hammered into shape under immense pressure. This process creates a much stronger and more durable piston than cast aluminum, making them ideal for engines that will see higher cylinder pressures and temperatures.

This particular set is designed for an 87.0mm bore, which is a +1.0mm oversize. This is common when rebuilding an engine where the cylinders have been worn beyond their original specification and need to be bored out to match the new piston size. The compression ratio comes in at 8.5:1, which is a good target for boosted applications where you want to maintain reliability under boost. CP Pistons are well-known in the performance world for their attention to detail and the strength of their components. You'll find these pistons are a significant upgrade over stock, providing a strong foundation for your RB25DET's performance goals.

This set includes the pistons and the necessary rings to get them installed. Remember that when boring your cylinders to 87.0mm, it's important to ensure the machine shop provides a proper finish for the rings to seat correctly. Also, keep in mind that these pistons are not CARB approved and cannot be shipped to California. Always refer to your engine builder's recommendations for assembly and break-in procedures to ensure the longevity of your build.