CP Piston & Ring Set for Miata BPZ3 - Bore (84mm) - Size (+1.0mm) - Compression Ratio (9.0)

If you're rebuilding the engine in your 1999-2002 Mazda Miata, especially if you're looking to handle more power or refresh a worn-out engine, a set of forged pistons like these from CP Pistons is a solid choice. These are specifically made for the Miata's BPZ3 engine, measuring 84mm in bore diameter and coming at a +1.0mm oversize. This means they're designed to replace stock pistons that have been bored out slightly, often done during an engine rebuild to ensure a fresh, perfectly round cylinder wall for optimal sealing.

CP Pistons are well-known for their forged construction, which uses a block of aluminum that's 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 see hard use or are modified for increased performance. These particular pistons are designed with a 9.0:1 compression ratio, which is a good balance for many performance applications, offering a noticeable bump in power without being so high that it requires extremely high octane fuel or extensive tuning for reliability. The set includes the pistons and the necessary rings, making it a complete package for your engine build.

When installing these pistons, remember they are an oversize part, meaning your engine block's cylinders will need to be bored to 84mm to ensure a proper fit and seal. It's always recommended to consult your engine's service manual or a professional mechanic for the correct installation procedures, including ring gap settings and piston-to-wall clearance. Please note that these pistons are not CARB approved and cannot be shipped to California.