JE Pistons JG4904-3917 Piston Ring Set 1.2/1.2/2.5 for 99.5mm Bore 4-Cylinder

Vehicle Fitment

• Universal fitment for 4-cylinder performance engines with 99.5mm (3.913") bore size

Features

• Designed for high-performance applications
• File-fit rings for precise customization
• Top ring: 1.2mm thickness, carbon steel nitride
• Second ring: 1.2mm thickness, iron phosphate
• Oil ring: 2.5mm thickness, low tension three-piece design
• Bore size: 99.5mm
• Maximizes horsepower through precise sealing
• Compatible with turbocharged and naturally aspirated engines

Specifications

• Bore Diameter: 99.5mm (3.913")
• Top Ring Thickness: 1.2mm
• Second Ring Thickness: 1.2mm
• Oil Ring Thickness: 2.5mm
• Oil Ring Width: 99.5mm
• Material: Carbon Steel Nitride (Top), Iron Phosphate (Second), Carbon Steel Chrome (Oil)
• Ring Stack: 1.2mm / 1.2mm / 2.5mm
• File Fit: Yes

Included Components

• 1x Top Compression Ring
• 1x Second Compression Ring
• 1x Oil Ring Assembly
• 1x Oil Ring Expander
• 1x Oil Ring Rail
• 1x Top Ring Spacer
• 1x Second Ring Spacer
• 1x Oil Ring Spacer

Product Description

The JE Pistons JG4904-3917 Piston Ring Set is designed for high-performance 4-cylinder engines with a 99.5mm (3.913") bore. This file-fit set allows precise customization for rebuilds or performance upgrades. The top compression ring, 1.2mm thick, is carbon steel nitride for durability and heat resistance. The second ring, also 1.2mm thick, features iron phosphate for excellent wear resistance. The 2.5mm oil ring assembly is a low tension three-piece design to improve oil control while reducing friction.

Ideal for turbocharged or naturally aspirated engines, this universal piston ring set accommodates a variety of 4-cylinder high-performance applications. The JE Pistons JG4904-3917 ensures reliable sealing, optimized compression, and enhanced performance across multiple engine platforms.