S52 Forged Piston Set 86.60mm Bore

The Mahle Motorsports S52 piston set is engineered for demanding performance builds, offering a significant upgrade over stock cast aluminum pistons. Crafted from robust 4032 alloy, these forged pistons provide superior strength, reduced weight, and lower drag, which are critical for handling increased performance, especially in turbocharged or highly tuned engines. Featuring a high compression ratio of 11.2:1 and precise dimensions including an 86.60mm bore, 89.6mm stroke, 135.0mm rod length, and 31.0mm compression height, these pistons are designed to extract maximum power. The piston crown volume is -11.0cc, contributing to the elevated compression. Mahle applies a Grafal coating on the piston skirts to minimize drag, friction, and cylinder bore wear, while a phosphate coating protects other surfaces. These pistons are offered in 2nd or 3rd oversize bores to optimize engine displacement. It is crucial to check valve-to-piston clearance meticulously during assembly due to the higher compression and redesigned crown shape. The set comes complete with a high-performance ring set, wrist pins, and circlips, and is proudly made in the USA.