CP Piston & Ring Set for Nissan SR20DE/DET - Bore (90mm) - Size (+4.0mm) - CR (9.1) Set of 4

If you're rebuilding the engine in your 1989-1998 Nissan 240SX, especially for a performance application with the SR20DE or SR20DET engine, a strong set of pistons is fundamental. This set from CP Pistons is built to handle increased stress and deliver reliable performance when you need it most. These aren't just replacements; they're a critical component for anyone looking to push their engine beyond stock capabilities.

CP Pistons are well-known in the performance world for their robust construction. These particular pistons are forged from high-strength aluminum alloy, a process that creates a denser, more durable component than cast pistons. This forging process allows them to withstand higher cylinder pressures and temperatures, which is crucial for modified or boosted engines. The set is designed for a 90mm bore, which is a +4.0mm oversize from the stock bore, meaning these are intended for engines that have already been bored out to accommodate them. They feature a 9.1:1 compression ratio, a popular choice that offers a good balance between power and drivability, making them suitable for a wide range of performance tuning goals. The set includes rings specifically matched to these pistons, simplifying the assembly process.

When installing these pistons, remember they are an oversize part, so your engine block will need to be machined to the correct 90mm bore size. This is a standard procedure for performance engine builds where increased displacement or improved strength is desired. Because these are performance pistons, it's important to ensure all other supporting components in your engine build are up to the task, including proper tuning, cooling, and lubrication systems. This set is a solid foundation for a high-output SR20 engine.