ARP Ring Compressor

Specialty Kit for Bore Sizes 4.39 Inches

Part #: 900-3900

Overview

The ARP Ring Compressor (900-3900) is a precision-engineered specialty kit designed to facilitate the installation of piston rings during engine rebuilds or assembly. Crafted from high-quality materials and featuring advanced CNC-machined components, this ring compressor kit is ideal for automotive enthusiasts, professional engine builders, and performance tuners who demand accuracy and durability. Whether you're working on a high-performance street engine or a race application, this tool ensures a secure, precise fit for piston rings, helping to maintain optimal compression and engine efficiency.

Designed with the serious engine builder in mind, the ARP Ring Compressor kit simplifies the process of installing tapered piston rings, reducing the risk of damage and ensuring proper seating. Its specialized design accommodates wire O-rings on the bottom, making it suitable for a variety of piston configurations. With this kit, you'll get a reliable, long-lasting tool that supports your engine assembly projects with confidence and precision.

Key Features

The ARP Ring Compressor (900-3900) boasts several technical features that set it apart from conventional tools:

• Constructed from CNC-machined 6061-T6 billet aluminum, providing exceptional strength and lightweight handling.
• True-radius design for each bore diameter ensures a perfect fit, reducing installation errors and potential piston damage.
• Relieved to accommodate wire O-rings on the bottom of pistons, making it versatile for various engine builds.
• Type 3 anodizing finish enhances corrosion resistance and longevity, even in demanding engine environments.
• Prominently engraved bore size markings in 3/4 inch high numbers allow for quick identification and selection, streamlining your assembly process.
• Precision machining ensures smooth operation and consistent performance across different bore sizes.
• Designed to provide a secure, even compression of piston rings during installation, supporting proper ring seating and sealing.
• Compatible with a wide range of bore sizes, making it a versatile addition to any engine builder's toolkit.
• Durable construction and high-quality materials ensure long service life, even with frequent use in professional shops or personal garages.

Construction & Design

The ARP Ring Compressor (900-3900) features a meticulously CNC-machined billet aluminum tube that guarantees precise dimensions and a robust structure. The true-radius design of each compressor is tailored to match specific bore diameters, providing a snug, accurate fit that minimizes ring deformation or damage during installation. The reliefs incorporated into the design allow for wire O-rings, expanding the kit's compatibility with various piston configurations.

The Type 3 anodizing process not only enhances the aesthetic appeal but also significantly improves corrosion resistance, ensuring the tool maintains its integrity over many engine rebuilds. The prominent engraving of bore sizes allows quick and easy identification, saving valuable time during assembly. Overall, the design prioritizes ease of use, durability, and precision, making it an essential tool for high-performance engine assembly.

Installation & Fitment

The ARP Ring Compressor (900-3900) is designed for straightforward, bolt-on use. Simply select the appropriate bore size, position the compressor over the piston rings, and gently compress the rings into the piston grooves. Its true-radius design ensures a smooth, even application, minimizing the risk of ring deformation or piston damage. No cutting, drilling, or special tuning is required to use this tool, making it suitable for both professional and DIY engine builders.

• Easy to use with a secure fit for piston rings of specified bore sizes.
• Designed to slide over the piston and rings effortlessly, then compress the rings evenly during installation.
• Supports quick, accurate piston ring seating, reducing assembly time and improving engine sealing.

What's Included

• Complete ring compressor kit with CNC-machined billet aluminum tube
• Size markings engraved for quick identification
• Reliefs for wire O-rings
• All necessary hardware and instructions for use

Ideal For

• Engine builders and rebuilders seeking precise piston ring installation tools
• Performance enthusiasts working on high-performance or stock engine rebuilds
• Professional machine shops and DIY mechanics aiming for accurate, damage-free assembly
• Anyone requiring a durable, reliable ring compressor for bore sizes around 4.39 inches