RCM Subaru EJ Series Dry Sump Drive Pulley Upgrade Kit

RCM Subaru EJ Series Dry Sump Drive Pulley Upgrade Kit

Upgrade to 34mm Wide Pulley for Improved Belt Grip & Reliability

The RCM Dry Sump Drive Pulley Upgrade Kit is a complete solution designed to upgrade early-generation (pre-2025) RCM Subaru EJ Series dry sump systems to the latest 34mm wide drive pulley standard. This wider pulley provides significantly improved belt engagement and grip, reducing the risk of belt slip under high engine loads and sustained RPM — particularly in demanding motorsport environments.

If you're running a pre-2025 RCM dry sump kit with the narrower 28mm pulley, this kit contains everything you need to bring your system up to current RCM specifications.

Key Benefits:

• Increased Belt Grip
  The wider 34mm pulley offers greater surface contact for the drive belt, improving reliability under extreme loads and reducing the risk of slippage.

• Motorsport-Proven Upgrade
  Developed through extensive competition use, this upgrade enhances oil system performance and peace of mind in racing conditions.

• Complete Conversion Kit
  Includes all required components for a seamless installation — no custom fabrication or additional parts needed.

What’s Included:

• 34mm Wide Oil Pump Drive Pulley

• Matching hardware and spacers

• Any required alignment or mounting components

• Full installation instructions (if applicable)

Compatibility & Fitment:

• Designed for use with RCM Subaru EJ Dry Sump Systems (Pre-2025)

• Not compatible with OEM or other aftermarket sump systems

• Required when upgrading to the 34mm pulley on older kits

Recommended For:

• Subaru EJ engine builds using RCM dry sump systems (pre-2025)

• Race, rally, time attack, or high-performance applications

• Customers experiencing belt wear, slippage, or looking to modernize their dry sump system

Note: If your kit already includes the 34mm pulley (standard from 2025 onward), this upgrade kit is not required.