Ring Compressor Tool, 87mm

OVERVIEW

Precision is the cornerstone of a reliable air-cooled build, and nothing ruins a Saturday afternoon faster than snapping a fresh set of rings because of a flimsy, universal band-style compressor. This AA Performance Products 87mm Ring Compressor Tool is the definitive solution for the serious VW engine builder who demands a seamless assembly process. Unlike generic tools that can slip or cause the rings to hang up on the cylinder edge, this tapered aluminum sleeve is engineered specifically for the 87mm bore. By providing a smooth, gradual transition as the piston slides into the barrel, it ensures that your rings stay perfectly seated and square, eliminating the risk of micro-fractures or improper tension that can lead to premature blow-by or oil consumption. Whether you are refreshing a classic or assembling a high-performance street machine, this tool is the professional choice for a "one-and-done" installation.

Crafted from high-grade billet aluminum and finished with a durable coating, this tool is designed to withstand the rigors of a busy shop environment while remaining gentle on your components. The 87mm size is most commonly utilized in the popular 1641cc "slip-in" big bore kits, making this an essential addition to the toolbox of any Type 1 enthusiast looking to squeeze a bit more displacement out of their 1600cc base. Because it is a fixed-diameter tapered sleeve, there are no moving parts to fail or adjust, meaning you get a perfect compression every single time. Stop struggling with pliers or universal clamps that scratch your pistons and potentially damage your cylinder walls. Invest in a tool that respects the tolerances of your air-cooled powerplant and makes the most difficult part of the short-block assembly the easiest part of your day.

FITMENT

This 87mm ring compressor is designed specifically for Volkswagen air-cooled engines utilizing 87mm pistons and cylinders. This includes, but is not limited to, the following applications:

• Volkswagen Type 1: Beetle and Bug models from 1966 through 1979 (typically used with 1641cc big-bore kits).
• Volkswagen Type 2: Bus, Transporter, and Kombi models from 1963 through 1971 utilizing the upright Type 1 engine configuration.
• Volkswagen Type 3: Fastback, Squareback, and Notchback models equipped with 87mm overbore kits.
• Volkswagen Karmann Ghia: All years equipped with 1600cc based engines upgraded to 87mm pistons.
• Custom Applications: Any dune buggy, sand rail, or trike utilizing a VW-based 87mm piston and cylinder set.

SPECS

• Bore Diameter: Exact 87.00mm for precision fitment.
• Material: High-quality lightweight billet aluminum construction.
• Design Type: Fixed-diameter tapered sleeve for consistent ring compression.
• Finish: Anodized or machined finish for corrosion resistance and reduced friction.
• Manufacturer: AA Performance Products.
• Part Number: RC8700T1.
• Compatibility: Compatible with all standard and performance 87mm ring sets.
• Height: Optimized sleeve height to allow for easy piston pin access during assembly.

PRO TIPS

1. Lubrication is Your Best Friend

Never attempt to push a dry piston and ring assembly through the compressor. Before you start, apply a generous amount of high-quality assembly lube or clean 30-weight engine oil to the inside of the tapered sleeve and the ring landings on the piston. This reduces friction and ensures the rings slide smoothly into the cylinder without catching. A well-lubricated tool also helps protect the finish of the aluminum compressor, ensuring it stays smooth for dozens of future builds. Don''t forget to verify your ring gaps before this final step, as once they are in the compressor, you are committed to the install.

2. The "Tap and Feel" Method

When you are ready to transfer the piston from the compressor into the cylinder, place the compressor firmly against the top of the cylinder deck. Use the wooden or plastic handle of a clean hammer to gently tap the top of the piston. Never force it with a heavy blow. If you feel significant resistance, stop immediately. It is possible a ring has popped out or is not seated correctly in the groove. Pull the piston back out, re-align the ring gaps (standard 120-degree or 180-degree offset depending on your preference), and try again. The piston should slide in with a series of light, rhythmic taps.

3. Maintain Tool Integrity

Aluminum is a soft metal compared to the steel rings it compresses. To ensure your 87mm tool lasts a lifetime, always wipe it down after use and store it in a place where it won''t get dinged or scratched by other heavy steel tools like wrenches or pry bars. Even a small burr on the bottom edge of the compressor can scratch a piston skirt or catch a ring. If you do notice a small nick over time, use a very fine emery cloth (600 grit or higher) to lightly polish the area. Keeping the mating surface perfectly smooth is the secret to the effortless engine assembly that the pros at Appletree Auto swear by.