The High Speed Engineering RB25/RB26 Extended Crankshaft Drive Collar is an essential upgrade for early Nissan RB-series engines featuring the short-snout crankshaft design. The factory crank engagement is extremely shallow and relies on a narrow drive flat, making it prone to wear, stripping or complete failure when paired with upgraded oil pumps, increased RPM or high-performance applications.

This billet drive collar provides a full-length, precision-machined engagement surface that dramatically strengthens the connection between the crankshaft and oil pump gear. It is also the ideal solution for repairing crankshafts with a worn or damaged drive face, restoring proper engagement and preventing premature oil pump failure.

Compatibility:

• Suits Nissan RB25DET & RB26DETT engines using early “short snout” crankshafts
• Recommended for engines retaining the OEM flat-drive oil pump system
• Compatible with OEM pumps, N1 pumps and aftermarket billet gear sets
• Highly recommended when upgrading early 81 mm pump gears

Key Features:

• Billet Steel Construction: Manufactured from high-grade steel for superior durability and long-term reliability.
• Extended Engagement Surface: Provides a significantly larger and stronger drive area than the factory flat, reducing the risk of shearing or wear.
• Perfect for Repair: Ideal for engines with a damaged or partially worn crank drive face, restoring proper engagement without requiring crankshaft replacement.
• Precision CNC Machining: Ensures perfect fitment and alignment on the crank snout.
• High-RPM Safe: Designed to withstand elevated rev limits, limiter use and motorsport conditions where the OEM design commonly fails.
• Improved Oil Pump Reliability: A critical upgrade when fitting billet pump gears or higher-capacity oil pumps.

Why Install a Crankshaft Collar?

• Early RB25 and RB26 engines have a very shallow factory drive flat.
• Increased power and RPM place heavy stress on this small contact area.
• Failure of the engagement flat results in instant oil pressure loss.
• The extended collar provides a robust, extended engagement surface for long-term stability.
• It is the best method for repairing a damaged crankshaft drive flat without crank replacement.

The High Speed Engineering RB25/RB26 Crankshaft Drive Collar is a critical reliability upgrade for any serious high-performance RB engine build. Whether you’re building a forged street motor, a drift engine or a high-RPM circuit car, this collar ensures secure oil pump drive engagement and protects your engine from one of the RB platform’s most notorious failure points.

Notes

• It is the engine builders responsibility to ensure that all components are clean, undamaged and free running BEFORE and AFTER installation.