CP Piston & Ring Set for Miata BPZ3 - Bore 84mm - Size +1.0mm - CR 9.0 -Single Piston

This is a single forged piston and ring set from CP Pistons, specifically made for the Miata BPZ3 engine. It features an 84mm bore size, is 1.0mm oversized, and has a 9.0 compression ratio. CP Pistons are well-known for their robust construction, using high-strength aluminum alloys to withstand the demands of performance engines. This set is designed to be a direct replacement for your stock pistons, but with improved durability for boosted or high-performance applications. The included rings are matched to the piston for a proper seal, which is crucial for maintaining compression and preventing oil blow-by.

When you're rebuilding the top end of your Miata's BPZ3 engine, especially if you're planning on adding a turbocharger or increasing boost pressure, using strong pistons is essential. These CP Pistons are forged, meaning they start as a solid block of aluminum that's heated and hammered into shape under immense pressure. This process creates a much denser and stronger grain structure than cast pistons, making them more resistant to deformation and failure under high cylinder pressures and temperatures. The 1.0mm oversize means these are intended for engines that have already been bored out to accommodate them, ensuring a precise fit within the cylinder walls.