ARP Ring Compressor

4.0400 Ring Compressor Specialty Kit for Bore Sizes up to 4.040 inches

Part #: 900-0400

Overview

The ARP Ring Compressor (900-0400) is a precision-engineered specialty kit designed to simplify the process of installing piston rings in high-performance engines. Crafted by ARP, a renowned name in the automotive fastener and engine component industry, this ring compressor kit is ideal for engine builders, professional mechanics, and automotive enthusiasts who demand the highest quality tools for their rebuilds and performance projects.

This kit features CNC-machined components made from durable 6061-T6 billet aluminum, ensuring longevity and reliable performance under demanding conditions. The true-radius design of each compressor is specifically engineered to match the bore diameter, providing a perfect fit that minimizes ring distortion and installation effort. The reliefs incorporated into the design accommodate wire O-rings on the bottom of the piston rings, making it suitable for a wide range of high-performance and racing applications.

Key Features

The ARP Ring Compressor kit offers several advanced features that set it apart from conventional tapered devices:

• Manufactured from CNC-machined 6061-T6 billet aluminum for exceptional strength, lightweight handling, and corrosion resistance.
• True-radius design for each bore size ensures a precise fit, reducing the risk of ring damage during installation.
• Relieved to accommodate wire O-rings on the bottom of piston rings, making it versatile for various engine configurations.
• Type 3 anodizing provides a long-lasting, corrosion-resistant finish that maintains appearance and performance over time.
• Clear, prominent engraving of bore sizes in 3/4 inch high numbers allows for quick identification and easy selection during assembly.
• Designed for bore sizes up to 4.040 inches, suitable for a wide range of performance engines.
• Optimized for professional engine builders and serious enthusiasts seeking precision and durability.
• Improves installation efficiency by providing a uniform, controlled compression of piston rings, reducing installation time and potential damage.
• Compatible with various piston designs, including those with wire O-rings, ensuring broad applicability.

Construction & Design

The ARP Ring Compressor (900-0400) is meticulously crafted from high-grade 6061-T6 billet aluminum, a material known for its excellent strength-to-weight ratio and corrosion resistance. The CNC-machining process ensures tight tolerances and a smooth surface finish, which is critical for achieving a perfect seal and preventing ring distortion during installation.

The true-radius profile of each compressor is tailored to match specific bore diameters, providing a snug fit that facilitates effortless piston ring installation. The reliefs incorporated into the design are precisely machined to accommodate wire O-rings, a feature that enhances versatility for different piston configurations. The Type 3 anodized finish not only adds a sleek appearance but also protects against wear and corrosion, ensuring the tool maintains its integrity over countless rebuilds.

Performance & Benefits

Using the ARP Ring Compressor kit ensures a smooth, hassle-free piston ring installation process, which is essential for maintaining ring integrity and achieving optimal engine performance. The precise fit reduces the risk of ring damage, improves sealing, and helps support consistent compression ratios. This tool is especially beneficial for high-performance and racing engines where precision assembly is critical for maximizing power output and reliability.

Installation & Fitment

The ARP Ring Compressor (900-0400) is designed as a bolt-on tool that requires no special modifications or adjustments. Its CNC-machined construction guarantees a perfect fit for bore sizes up to 4.040 inches, making it compatible with a wide range of piston and engine configurations. No cutting, drilling, or tuning is necessary to use this kit, simplifying the assembly process and reducing downtime.

• Easy to use with standard hand tools.
• Provides uniform compression for piston rings during installation.
• Designed for professional and DIY engine builders alike.

What's Included

• Complete CNC-machined billet aluminum ring compressor with bore size engraving.
• Reliefs for wire O-rings included.
• Durable anodized finish for long-lasting performance.
• Instruction manual for proper usage and care.

Ideal For

• Engine builders and rebuilders working on high-performance engines.
• Automotive enthusiasts performing engine assembly or rebuilds.
• Professionals seeking precision tools for piston ring installation.
• Racing teams and performance shops requiring reliable, durable tools.

Emissions Note

This product is a specialized tool designed for engine assembly and does not impact emissions or legal compliance. It is intended for use in off-road, racing, or performance applications where legal restrictions are not applicable.