Mahle Piston Set 14-19 Porsche 991 3.8L T 102mm Bore 77.5mm Stroke 138mm Rod 23mm Pin -7.6cc 9.0 CR

Mahle's forged pistons for the 2014-2019 Porsche 991 3.8L T are built with a 102mm bore, a 77.5mm stroke, and a 138mm rod length. These pistons feature a -7.6cc dish volume, resulting in a 9.0 compression ratio. This specific design is crucial for achieving optimal performance and reliability in high-output engines where precision matters.

Crafted from high-strength forged aluminum, these pistons are significantly more durable and resistant to detonation than cast pistons. The forging process aligns the metal's grain structure, making them capable of withstanding the extreme pressures and temperatures found in performance applications. The 23mm wrist pin diameter ensures a strong connection to the connecting rod, further enhancing their robustness under load. Mahle's attention to detail in the piston crown design, with its -7.6cc dish, is engineered to work seamlessly with the cylinder head's combustion chamber to achieve the target 9.0 compression ratio, balancing power output with fuel requirements.

This set is designed as a direct replacement for the factory pistons, simplifying installation for mechanics familiar with Porsche engine builds. It's important to note that these pistons are not CARB approved and cannot be shipped to California. For a complete engine rebuild, ensure you have all necessary supporting components, such as rings, bearings, and gaskets, which are typically sold separately.