Boundary RB26-81-OPG-M MartenWear Oil Pump Gear for Nissan RB26 81mm R32-R34

Vehicle Fitment

• 1989-1994 Nissan Skyline GT-R (R32), RB26DETT 2.6L
• 1995-1998 Nissan Skyline GT-R (R33), RB26DETT 2.6L
• 1999-2002 Nissan Skyline GT-R (R34), RB26DETT 2.6L

Fitment Notes

• Fits the OEM oil pump housing (81mm) only
• Not compatible with aftermarket N1 housings - those require the separate RB26N1-OPG or RB26N1-OPG-M
• Direct drop-in replacement - no spline drive modification needed

Features

• Replaces the weak factory asymmetrical rotor with a tighter-sealing, symmetrical gear design
• Higher-volume design delivers a bump in idle and mid-range oil pressure
• Engineered crankshaft interface reduces wear on crank surfaces
• MartenWear thermal processing for extreme anti-wear resistance
• Tested to 13,000 RPM for reliability
• ColdFlow surface hardening and mirror finish for reduced friction
• 100% manufactured in-house in the USA
• Backed by one of the industry's best warranties

Specifications

• Material: Chromoly billet
• Surface treatment: MartenWear thermal processing
• Housing fitment: OEM, 81mm
• RPM rating: Tested to 13,000 RPM

Included Components

• 1x Boundary MartenWear Billet Oil Pump Gear

Product Description

The Boundary RB26-81-OPG-M is a MartenWear-treated billet oil pump gear built for the Nissan RB26DETT, found in the R32, R33, and R34 Skyline GT-R. It replaces the factory's weak asymmetrical rotor design with Boundary's race-inspired symmetrical gear pattern, delivering tighter sealing and higher oil volume for a noticeable bump in idle and mid-range pressure.

Its engineered crankshaft interface reduces wear on crank surfaces and eliminates the need for a spline drive, making it a straightforward drop-in replacement for the OEM 81mm housing. MartenWear thermal processing extends anti-wear performance, and the gear is tested to 13,000 RPM for reliability. 100% manufactured in the USA.