CP Piston & Ring Set for Acura NSX C30A - Bore (90.5mm) - Size (+0.5mm) - CR (9.0) - Set of 6

This is a set of six forged pistons and rings from CP Pistons, specifically made for the Acura NSX with the C30A engine. These pistons are designed to be 90.5mm in bore size, which is a +0.5mm oversize from the factory specification. They feature a 9.0:1 compression ratio, making them a solid choice for rebuilding or enhancing the performance of your NSX's engine. CP Pistons are well-known in the performance engine building community for their robust construction and attention to detail, ensuring that your engine can handle the demands of spirited driving or track use.

Forged pistons, like these from CP Pistons, start as a solid block of aluminum that is heated and then hammered into shape under immense pressure. This process creates a much stronger and more durable piston compared to cast pistons, which are made by pouring molten aluminum into a mold. The strength of forged pistons means they can withstand higher cylinder pressures and temperatures, which is crucial for modified or high-performance engines. The 9.0:1 compression ratio is a good balance, offering improved power output over stock while still being suitable for pump gasoline in many applications. This specific set is a +0.5mm oversize, meaning it's intended for engines that have already been bored out slightly from their original factory dimensions, often done during a performance rebuild to ensure a fresh, tight seal.

When installing these pistons, it's important to ensure your engine block has been properly machined to the correct 90.5mm bore size and has a smooth finish. The included rings are designed to work with these pistons to create a proper seal between the piston and cylinder wall, which is vital for compression, oil control, and engine longevity. Because these are performance-oriented components, it's recommended to consult with a professional engine builder to ensure proper installation and to match them with other suitable engine components for optimal performance and reliability.