The High Speed Engineering EN26 Billet Oil Pump Gear Set with Splined Crankshaft Drive Adaptor is a premium-strength upgrade engineered to eliminate the well‑known failure points of the Nissan RB oil pump system. Designed for serious performance and motorsport engines, this kit replaces the fragile OEM sintered gears with precision-machined EN26 billet steel components, ensuring exceptional durability at high RPM.

Compatible with 77 mm oil pump gear setups, this kit is suitable for all RB26DETT and RB25DET (NCVS & NEO) engines running N1 oil pumps or revised later‑model OE pumps.

Compatibility (77 mm rotor):

• Suits all Nissan RB26DETT
• Suits all RB25DET (NCVS and NEO)
• Compatible with N1 oil pumps and revised OE pumps using a 77 mm outer rotor gear
• Correct pumps can be identified externally by a backing plate with 7 perimeter bolts plus 1 centre bolt (8 total)

Not compatible with early 81 mm pump versions:

• Early RB oil pumps use an 81 mm outer rotor
• These feature 7 bolts total (including the centre bolt) on the backing plate
• A different gear set is required for 81 mm pumps

Key Features:

• EN26 Billet Steel Gears: Far stronger than OEM sintered gears, offering exceptional resistance to shock load, fatigue, and high‑RPM harmonics.
• Splined Drive Adaptor: Replaces the weak OEM flats with a positive‑engagement splined interface, preventing drive failure at high engine speed.
• 77 mm Gear Set: Direct replacement for N1 and late‑revision OE pump gearsets.
• CNC Precision Machining: Ensures perfect meshing, consistent tolerances, and stable oil pressure throughout the rev range.
• High‑RPM Reliability: Designed to withstand the extreme demands of high‑boost, high‑rev RB engines.
• Motorsport‑Ready Construction: Ideal for drag, circuit, drift, and high‑performance street builds.

Why Choose This Kit?

• Prevents catastrophic oil pump failure — a common issue in RB engines with increased RPM limits.
• Improves long‑term pump stability and oil pressure consistency.
• Provides a robust, positive‑locking drive method superior to the OEM design.
• Essential for any RB engine revving beyond factory limits or producing significant power increases.

The High Speed Engineering EN26 Billet Gear Set & Splined Drive Adaptor is one of the most important upgrades you can make to ensure the reliability of any high‑performance RB26 or RB25 engine running the 77 mm oil pump configuration.

Notes

• It is the engine builders responsibility to ensure that all components are clean, undamaged and free running BEFORE and AFTER installation.
• Gears must be assembled initially with clean engine oil or assembly grease. Do NOT run dry!
• With the inner and outer gear sitting in front of you and the nose/seal diameter facing toward you, the outer gear should be laid over the inner gear with the “wave” profile in a clockwise orientation. The 2 wave “points” should be facing in the same direction (see assembly instructions).
• These gears are direct replacements for standard gears. If something doesn’t fit easily, then something isn’t right. You should not have to modify the housing and once installed, the gears should spin freely, with no restriction other than the oil seal.