ARP 901-9100 Billet Aluminum Piston Ring Compressor Tool

The ARP 901-9100 is a professional-grade piston ring compressor designed for precision engine assembly. CNC machined from 6061-T6 billet aluminum tube material, this tool features a true radius design that matches the exact bore diameter, providing superior performance compared to conventional tapered compressors.

Key Features:

• CNC machined from 6061-T6 billet aluminum for strength and durability
• True radius design precisely matches bore diameter for consistent ring compression
• Bottom relief machined for wire O-ring compatibility
• Type 3 hard anodized finish for long-lasting wear resistance
• Bore size engraved in large 3/4-inch high numbers for easy identification
• Professional quality tool widely acclaimed by engine builders

This precision tool ensures proper piston ring compression during installation, preventing ring damage and ensuring correct seating. The true radius design distributes pressure evenly around the entire ring circumference, making piston installation smoother and safer than traditional tapered compressors. ARP offers these compressors in standard sizes ranging from 3.552 to 4.750 inches (SAE) and 75mm to 95.5mm (metric).