JE Pistons JG4904-3927 Piston Ring Set 1.2/1.2/2.5 for 99.75mm Bore 4-Cylinder

Vehicle Fitment

• Universal fitment for 4-cylinder performance engines with 99.75mm (3.925") 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: 99.75mm
• Optimized sealing for high-performance engines
• Compatible with turbocharged or naturally aspirated setups

Specifications

• Bore Diameter: 99.75mm (3.925")
• Top Ring Thickness: 1.2mm
• Second Ring Thickness: 1.2mm
• Oil Ring Thickness: 2.5mm
• Oil Ring Width: 99.75mm
• 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 JG4904-3927 Piston Ring Set is a universal solution for 4-cylinder high-performance engines with a 99.75mm (3.925") bore. The set includes a 1.2mm carbon steel nitride top ring for durability, a 1.2mm iron phosphate second ring for excellent wear resistance, and a 2.5mm low tension three-piece oil ring assembly for improved oil control and reduced friction.

Designed for both turbocharged and naturally aspirated applications, this file-fit piston ring set allows precise installation adjustments. The JE Pistons JG4904-3927 ensures optimal compression, reliable sealing, and consistent performance across a wide range of 4-cylinder performance engines.