Boundary RB26-81-OPG Billet Oil Pump Gear for Nissan RB26 (OEM 81 mm Housing)

Vehicle Fitment

• Nissan / Infiniti - RB26DETT 2.6 L engine
• Common vehicles: Skyline GT-R R32 (1989-1994), R33 (1995-1998), R34 (1999-2002)

Features

• Race-inspired symmetrical gerotor gear design for strength and efficiency
• Billet chromoly core for high durability under stress
• Mirror-finished and surface-hardened surfaces to reduce wear
• Surface-ground inner and outer gears for precision meshing
• Matched gear sets (inner + outer) for optimal sealing
• Each gear set is hand-inspected, machine-ground, and hardness-verified
• Optional MartenWear thermal processing for extreme wear resistance
• Tested for high RPM reliability (up to ~13,000 RPM in some variants)

Specifications

• Part Number: RB26-81-OPG
• Weight: ~1 lb
• Intended Housing: OEM 81 mm RB26 oil pump housing
• Material: Billet Chromoly Steel
• Gear Design: Symmetrical Gerotor

Included Components

• 1x Inner oil pump gear
• 1x Outer oil pump gear

Product Description

The **Boundary RB26-81-OPG** is a premium billet oil pump gear set designed specifically for the RB26 engine using the OEM 81 mm pump housing. It replaces the weak asymmetrical factory gear design with a stronger, race-inspired symmetrical gerotor profile that improves oil volume, sealing, and pressure.

Built from chromoly billet with mirror-finished and surface-hardened gear surfaces, this set offers excellent durability and reduced wear. The matched inner and outer gears ensure a tight, efficient seal, and the entire set is carefully inspected and ground to tight tolerances. For high-performance or tuned RB26 builds, Boundary also offers a MartenWear-treated version rated for very high RPMs.