Wiseco K655M865AP Nissan SR20 Turbo Forged Piston Kit -17cc 86.5mm Bore K1 Crank

The Wiseco K655M865AP is a forged sport compact piston kit designed for the Nissan SR20DE and SR20DET 2.0L 16-valve engine running a K1 Technologies crankshaft. Featuring a -17cc dished crown and an 86.5mm (3.405 in.) bore, this kit is specifically engineered to deliver a lower compression ratio ideal for high-boost forced induction builds where detonation resistance is critical.

Key Features:

• Bore: 86.5mm (3.405 in.) — +0.5mm oversize
• Crown Volume: -17cc dish with no valve reliefs
• Compression Height: 1.260 in. (32.00mm)
• Pin Diameter: 0.866 in. (22mm)
• Piston Material: Forged 2618 aerospace-grade aluminum for superior tensile strength and fatigue resistance
• ArmorGlide® Skirt Coating: Reduces friction, resists seizure, and enables quieter operation
• Ring Package Included: 1.0mm gas-nitrided steel top ring, 1.2mm phosphate-coated cast iron second ring, 2.8mm stainless steel oil ring
• Wrist Pin Style: Press-fit or floating; wrist pin and retainers included
• File Fit Rings: Yes — precision fitment for optimized ring seal
• Fully machined crown features with precision ring grooves, anti-detonation groove, and forced pin oiling
• Designed and matched for use with K1 Technologies crankshaft

Engineered and machined in the USA, Wiseco AP-series shelf-stock kits combine custom-level performance with the convenience of ready-to-ship availability. The deep -17cc dish makes this kit an excellent choice for SR20DET stroker and high-boost turbo applications where compression management is essential to reliability and power output.