ARP Ring Compressor

Universal Fitment

Part #: 901-8400

Overview

The ARP Ring Compressor (901-8400) is a specialized tool designed to assist engine builders and technicians during the assembly process. Crafted from high-quality CNC-machined 6061-T6 billet aluminum, this kit offers precise and reliable bore compression for a variety of piston sizes. Its true-radius design ensures a perfect fit around the piston rings, reducing the risk of damage and ensuring a smooth installation. Ideal for professional engine builders and serious DIY enthusiasts, this compressor helps streamline the assembly process, providing consistent results and protecting critical components during installation. The tapered design and reliefs for wire O-rings make this tool versatile and adaptable to different engine configurations. The durable Type 3 anodizing enhances corrosion resistance and longevity, ensuring the compressor maintains its performance over many uses. Clear, prominent engraving of bore sizes allows for quick identification, saving time during assembly and reducing errors.

Key Features

This ring compressor kit combines precision engineering with practical design to support efficient engine assembly. Key features include:

• Manufactured from CNC-machined 6061-T6 billet aluminum for strength and durability
• True-radius design for superior bore fit and reduced ring damage
• Relieved to accommodate wire O-rings on the bottom of pistons
• Type 3 anodized finish for corrosion resistance and long-lasting performance
• Engraved bore sizes for easy identification and quick selection
• Designed to provide consistent compression and protection during piston installation

Construction & Design

The ARP Ring Compressor features a precisely machined aluminum tube with a true-radius profile tailored to each bore size. The reliefs for wire O-rings are carefully incorporated to ensure compatibility with various piston designs. The Type 3 anodized coating not only enhances durability but also provides a sleek, professional appearance.

Installation & Fitment

This kit is designed for easy use with a wide range of engine builds. Simply select the appropriate bore size, position the compressor around the piston rings, and carefully slide the piston into the bore. The true-radius design ensures a snug, secure fit, facilitating smooth piston installation without damaging the rings or cylinder walls.

What’s Included

The package includes multiple bore sizes, each clearly engraved for quick identification, allowing you to select the correct compressor for your specific engine build. Hardware and additional accessories are not included, as this is a precision tool intended for professional and dedicated DIY use.