ARP Ring Compressor

3.150–3.386˝ (80–90mm) Ring Square Tool

Part #: 902-8086

Overview

The ARP Ring Compressor is a precision-engineered tool designed to simplify the process of installing piston rings during engine assembly. Crafted for performance enthusiasts, rebuilders, and professional engine builders, this ring squaring tool ensures accurate and consistent ring seating, which is critical for optimal engine performance and longevity. Whether you're working on a high-performance build or restoring a classic engine, this tool helps you achieve precise ring fitment with ease.

Constructed from high-quality materials and CNC-machined for exact tolerances, the ARP Ring Compressor provides a reliable solution for fitting piston rings onto pistons without damage or misalignment. Its dual-sized bore design accommodates a range of piston diameters, making it versatile for various engine sizes and applications. This tool is an essential addition to any engine builder’s toolkit, ensuring that your piston rings are properly squared and seated for maximum compression and efficiency.

Key Features

The ARP Ring Compressor offers several features that make it a standout choice for engine assembly:

• Manufactured from durable 6061 T-6 billet aluminum, providing strength and lightweight handling during installation.
• Black anodized finish not only enhances durability but also provides a professional, corrosion-resistant surface that withstands the rigors of engine assembly.
• Dual bore sizes, ranging from 3.150 inches to 3.386 inches (80mm to 86mm), allow for precise fitting across a variety of piston sizes, reducing the risk of ring damage or misalignment.
• Engraved bore sizes for easy identification, ensuring quick selection and reducing assembly time.
• Designed with CNC precision machining to ensure consistent bore dimensions and smooth operation.
• Adjustable bore range to accommodate different piston diameters, making it a versatile tool for multiple engine builds.
• Helps achieve proper ring seating, which is essential for optimal compression, power output, and engine durability.
• Easy to use with minimal effort, allowing for quick and accurate piston ring installation.

Construction & Design

The ARP Ring Compressor is meticulously CNC-machined from high-grade 6061 T-6 billet aluminum, ensuring a perfect balance of strength, weight, and durability. Its one-piece construction eliminates weak points and enhances reliability during use. The black anodized finish not only provides an attractive appearance but also offers excellent corrosion resistance, extending the lifespan of the tool.

The bore sizes are prominently engraved for quick identification, and the dual-sized design ensures compatibility with a wide range of piston diameters. The precise machining and high-quality materials guarantee a smooth, snug fit around the piston rings, facilitating easy installation without damaging the rings or pistons. This tool is engineered to help you achieve consistent, professional results every time.

Performance & Benefits

Using the ARP Ring Compressor during engine assembly ensures that piston rings are properly squared and seated, which is vital for maintaining compression and preventing leaks. The accurate bore sizing reduces installation errors, saving time and reducing the risk of costly rework. Its durable construction withstands repeated use in demanding workshop environments, making it a reliable choice for both hobbyists and professional engine builders.

Installation & Fitment

The ARP Ring Compressor is designed for straightforward, bolt-on use. Simply select the appropriate bore size, slide the tool over the piston and ring, and gently compress the ring onto the piston. No additional tools or modifications are required. Its lightweight aluminum construction allows for easy handling and maneuvering during assembly. This tool does not require any special tuning or adjustments, making it suitable for a wide range of engine rebuilds and performance projects.

What's Included

• ARP Ring Compressor (902-8086) with dual bore sizes
• Instruction manual for proper use and maintenance

Ideal For

• Engine builders and rebuilders
• Performance enthusiasts working on high-performance or stock engines
• Restoration projects requiring precise piston ring installation
• DIY mechanics seeking professional-quality tools

Emissions Note

This product is a specialized tool intended solely for engine assembly and does not impact emissions or legal compliance. It is not a vehicle component and does not require emissions certification.