CP Piston & Ring Set for Honda/Acura K20A/A2 - Bore 90.0mm - Size (+4.0mm) - Compression Ratio 12.5

This is a CP Pistons forged piston and ring set specifically made for Honda and Acura K20A and K20A2 engines. It features a 90.0mm bore size, which is 4.0mm larger than the stock bore, and is designed to achieve a 12.5:1 compression ratio. These pistons are a popular choice for builders looking to increase displacement and performance in their K-series engines.

Forged pistons like these are constructed from a solid block of aluminum alloy that is heated and hammered into shape under extreme pressure. This process creates a much stronger and more durable piston than cast pistons, which are made by pouring molten metal into a mold. The strength of forged pistons makes them ideal for high-performance applications where increased cylinder pressures and temperatures are common. The 12.5:1 compression ratio is a notable increase over stock, which will help to extract more power from the engine, especially when paired with appropriate tuning and supporting modifications. The 4.0mm oversize bore means these pistons are intended for engines that have already been bored out to accommodate larger pistons, often as part of a performance rebuild or to repair worn cylinders.

This set includes the pistons and the necessary rings to complete the installation. It's important to note that these pistons are not CARB approved and cannot be shipped to California. For installation, ensure your engine block has been accurately machined to the specified 90.0mm bore size. Proper ring gap setting and cylinder wall preparation are critical for optimal performance and longevity.