JE Pistons 291881 Piston Set, 2618, Inv Dome/dish, 3.504 Bore, 1.260 Cd, 0.787 Pin, Set Of 4.

The JE Pistons 291881 is a complete four-cylinder forged piston kit engineered for the Nissan QR25DE 2.5L engine. Featuring an inverted dome/dish crown design at a 10.50:1 compression ratio and a 3.504-inch (89.00 mm) bore, this kit is purpose-built for high-performance street and motorsport applications where strength, precision, and reliability are non-negotiable.

Key Features:

• 2618 Forged Aluminum Construction: Forged in the USA from high-tensile-strength 2618 aluminum alloy, providing exceptional durability under extreme heat, boost, and nitrous conditions
• Proprietary FSR (Forged Side Relief) Design: JE's exclusive forging profile reduces skirt width to minimize friction and power loss, while a shorter wrist pin saves additional rotating mass
• Inverted Dome/Dish Crown: -0.60 cc crown volume at 10.50:1 compression ratio with smooth-flowing radii for optimized flame travel across the combustion chamber
• Precision Specifications: 3.504 in. (89.00 mm) bore, 1.260 in. compression height, 0.787 in. (20 mm) wrist pin diameter
• JE Pro Seal Piston Rings Included: Barrel-faced top rings with plasma-moly inlays and taper-faced second rings with reverse torsional design reduce friction, improve ring seal, and extend service life
• Complete Kit: Includes all four pistons, matched Pro Seal ring sets, wrist pins, and wire locks — everything needed for installation
• Engineered in the USA: Each piston is machined in a dedicated manufacturing cell to tighter tolerances across 14 critical dimensions
• 23-Point Quality Inspection: Every piston set is verified in an environmentally controlled lab maintained at 68°F and 40% relative humidity to ensure dimensional conformity

With over 75 years of forged racing piston expertise, JE Pistons designs and manufactures 100% in the USA to deliver the ultimate combination of durability and performance — from the drift track to the drag strip.