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The JE Pistons Piston Kit, part number 394139, is engineered with proprietary aligned grain flow forging technology to deliver maximum tensile strength, making it ideal for high-performance engine applications. The 4.310-inch piston diameter and 10.25:1 compression ratio provide a balance of power and efficiency suitable for demanding environments. The kit includes two pistons, a premium ring pack, wrist pins, and wire locks, offering a comprehensive solution for engine rebuilds or upgrades.
Constructed with a ceramic crown coating, these pistons are designed to reduce heat transfer, enhancing durability and thermal stability under high RPM and boost conditions. Internal and external bracing maintains an optimal strength-to-weight ratio, ensuring longevity and resistance to fatigue. The 3D undercrown milling in non-critical areas reduces overall weight without sacrificing strength, improving engine responsiveness.
Advanced features such as lateral gas ports and an accumulator groove secure the power-producing ring seal at high RPM and boost levels, promoting consistent compression and performance. The proprietary Tuff Skirt, a moly-based dry film coating applied in-house, minimizes operating friction and enhances wear resistance. Offset pins reduce piston rock and operating noise, contributing to smoother engine operation. Skirt notches are precisely cut for optimal clearance at bottom dead center, further reducing unwanted contact and wear.
Designed for durability and performance, these pistons are a reliable choice for high-performance M8 engines, providing excellent strength, thermal management, and efficiency for racing or demanding street applications.
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