Supertech Performance P4-DU89-P1 Forged Piston 88mm Bore 9.5:1 CR All-Motor/Nitrous

The Supertech Performance P4-DU89-P1 is a competition-grade forged piston engineered for naturally aspirated and nitrous oxide applications. Featuring an 88.00mm bore diameter with a +0.50mm oversize and a 9.5:1 compression ratio, this piston is designed to deliver maximum power and durability for serious engine builds. Compatible ring set: GNH8900.

Key Features:

• Forged from enhanced 4032 aluminum alloy with additional Cu, Ni, and Mg for low thermal expansion, excellent wear resistance, and superior thermal conductivity
• Two- or three-step forging process produces a fine-grain structural alignment for maximum tensile strength and fatigue resistance
• Designed using the latest CAD software and Finite Element Analysis (FEA) for optimized strength-to-weight balance
• Multiple heat treatment stages ensure high tensile strength and evenly distributed hardness throughout the piston body
• Precision CNC-machined ring grooves with contact reduction grooves as standard
• Pin bores are honed and reamed for an exacting, precise wrist pin fit
• Wrist pins constructed from cold-extruded chrome-moly steel, secured with wire clip locks
• Phosphate dry lubricant coating on the skirt protects against ring micro-welding and enhances lubrication in the cylinder bore
• Compression ratio calculated with a .030" head gasket and .010" deck unless otherwise specified

Supertech Performance forged pistons are trusted by professional engine builders worldwide and are backed by over 40 years of racing piston engineering expertise. Sold per piston — order the quantity matching your engine's cylinder count (e.g., quantity of 4 for a 4-cylinder engine).