JE Pistons BMW S50B30US 86.25mm Bore 11.5:1 KIT Pistons Set of 6

Forged from 2618 aluminum, these JE Pistons are built for high-demand performance applications like the BMW S50B30US engine. This material offers the high tensile strength needed to withstand the pressures of serious engine builds. JE Pistons has been a leader in forged racing pistons for over 75 years, and this set reflects that experience, being engineered, forged, and machined 100% in the USA.

This kit is specifically designed for the S50B30US engine, featuring an 86.25mm bore and an 11.5:1 compression ratio, which is an updated compression level for improved performance. The proprietary Forged Side Relief (FSR) design helps minimize friction and power loss by reducing skirt width and using a shorter wrist pin, saving weight. Depending on the specific application, an accumulator groove might be included to help reduce combustion gas pressure, which can improve ring flutter and enhance ring seal for more consistent power delivery. Some applications also feature a skirt coating that reduces friction and wear on the piston skirts and cylinder walls, while also lowering operating noise.

When you order this kit, you're getting everything needed to install these pistons. It includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings. These pistons are made entirely in the USA, ensuring a well-built component for your engine build.