Mahle MS Piston Set K20 86.50mm Bore 86mm Stroke 139mm Rod 22mm Pin 12cc 12.9 CR Set of 4

This Mahle MS Piston Set includes four forged pistons, designed for K20 engines. Each piston measures 86.50mm in bore diameter, with a compression height of 30mm. They are built to work with an 86mm stroke and a 139mm connecting rod, utilizing a 22mm wrist pin. The pistons have a dish volume of 11.8cc, resulting in a compression ratio of 12.8:1, and each piston weighs approximately 333 grams.

These pistons are constructed from 4032 aluminum, a material known for its strength and resistance to thermal expansion, making it a solid choice for performance engine builds. The 12.8:1 compression ratio is notably higher than stock, which can lead to improved power output and throttle response when paired with appropriate tuning and supporting modifications. The 22mm pin size is common for many performance applications, offering a strong connection to the connecting rod.

When rebuilding or upgrading your K20 engine, these Mahle pistons offer a well-built foundation. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Ensure you have the necessary supporting components and tuning expertise to take full advantage of the increased compression ratio for optimal engine performance and reliability.