JE Pistons BMW S52B32US FSR Forged Piston Kit, 9.0:1 Ratio, Set of 6 (297170)

Designed for the BMW S52B32US engine, this JE Pistons forged piston kit delivers a 9.0:1 compression ratio, making it a precision-engineered solution for forced induction or high-performance rebuilds. Each piston is forged and machined in the USA from 2618 T6 high-tensile aluminum alloy to provide the structural integrity required for extreme racing conditions.

These pistons feature a proprietary Forged Side Relief (FSR) design, which reduces reciprocating weight and minimizes friction through a narrowed skirt width. To ensure a consistent combustion seal, an integrated accumulator groove manages gas pressure to reduce ring flutter, while specialized skirt coatings protect against wear and reduce operating noise during cold starts and high-load operation.

• Forged from 2618 T6 aluminum for high tensile strength in performance applications.
• FSR (Forged Side Relief) forging reduces skirt friction and wrist pin weight.
• Accumulator groove reduces pressure from combustion gases to improve ring seal.
• Skirt coating minimizes friction and wear on piston skirts and cylinder walls.
• Complete kit includes JE Pro Seal premium piston rings, wrist pins, and wire locks.
• Manufacturer Part Number: 297170