ARP 901-8200 Billet Aluminum Piston Ring Compressor

The ARP 901-8200 is a precision-engineered piston ring compressor designed for professional engine builders who demand the best tools for engine assembly. Unlike conventional tapered ring compressors, this tool features a true radius design that provides superior piston installation with minimal risk of ring damage.

Premium Construction and Design:

• CNC machined from 6061-T6 billet aluminum tube material for exceptional strength and durability
• True radius bore design matches the exact cylinder diameter for optimal ring compression
• Type 3 hard anodized finish for long-lasting corrosion resistance and wear protection
• Relieved bottom edge accommodates wire O-rings without interference
• Bore size prominently engraved in large 3/4-inch numbers for quick identification

Why True Radius Matters:

The true radius design ensures even compression around the entire circumference of the piston rings, preventing the ring gaps from catching or the rings from breaking during installation. This is far superior to tapered compressors that can create uneven pressure and increase the risk of ring damage. Professional engine builders widely prefer this design for its reliability and ease of use.

ARP manufactures these ring compressors in standard sizes ranging from 3.552 inches to 4.750 inches for SAE applications, and 75mm to 95.5mm for metric applications. Each compressor is precision-machined to a specific bore diameter, ensuring a perfect fit for your engine build.