Torque Solution Piston Ring Compressor 90-94mm - Subaru EJ20 Engine Tool | TS-TL-917

The Torque Solution Piston Ring Compressor (TS-TL-917) is a precision-engineered engine assembly tool designed specifically for Subaru EJ20 engines, accommodating bore sizes from 90.17mm to 93.98mm (3.55–3.70 inches). Built for engine builders, mechanics, and performance enthusiasts performing bottom-end rebuilds, this tool ensures piston rings are uniformly compressed for smooth, damage-free piston installation. If you're looking for the best piston ring compressor for EJ20 Subaru engines, this purpose-built tool eliminates the guesswork and protects your investment during assembly.

Key Features & Benefits

• Application-Specific Bore Range (90.17–93.98mm) — Engineered to perfectly match standard and lightly oversized EJ20 bore dimensions, ensuring a precise, snug fit every time without improvised workarounds.
• Uniform Ring Compression — Evenly compresses all piston rings simultaneously, preventing ring damage, misalignment, or breakage during installation — a common risk with universal-style tools.
• EJ20 Engine Compatibility — Purpose-built for the Subaru EJ20 engine family, the same flat-four powerplant found in the WRX, Impreza, Forester, and Legacy, making this tool an essential addition to any Subaru-focused shop or garage.
• Durable Construction — Manufactured to professional-grade standards to withstand repeated use across multiple engine rebuilds without deforming or losing clamping consistency.
• Time-Saving Design — Reduces assembly time compared to adjustable band-style compressors, letting you focus on build quality rather than fighting your tools.
• Torque Solution Quality — Backed by Torque Solution's reputation for precision aftermarket and performance tooling, trusted by professional engine builders and enthusiasts worldwide.

What's Included

• 1x Torque Solution Piston Ring Compressor (TS-TL-917)

Specifications

Installation

This tool is designed for use during engine bottom-end assembly. Slide the compressor over the piston and rings, tighten to compress the rings uniformly within the tool's bore range, then carefully drive the piston into the cylinder bore using a wooden hammer handle or rubber mallet. No permanent installation is required — this is a reusable assembly tool. Recommended for use by experienced engine builders or qualified mechanics familiar with Subaru EJ-series engine assembly procedures. Always refer to the OEM service manual for proper torque specs and assembly sequences.

Is this tool compatible with bored-out EJ20 engines? Yes — the TS-TL-917 accommodates bore sizes up to 93.98mm, making it suitable for engines that have been bored over standard dimensions, provided the final bore size falls within the supported range.