Higher engine speeds and more aggressive cam profiles place greater demand on the valvetrain of the RB25. The Supertech Performance Single Valve Spring Kit with Titanium Retainers (part number SPRK-2081-RB25) is engineered for Nissan RB25 DOHC engines with hydraulic lifters, providing the additional control and durability needed for performance applications while maintaining compatibility with the factory hydraulic system.
These single springs are manufactured from premium Superclean Chrome Silicon Vanadium steel alloy, chosen for its strength, fatigue resistance, and ability to retain structural memory under repeated high-rpm cycling. Supertech uses computer-aided design to keep wire stress within safe limits and to control harmonics, reducing the risk of valve float and improving long-term reliability. The kit includes lightweight titanium retainers that lower valvetrain mass, allowing the springs to control the valves more effectively as rpm increases.
With a seat pressure of approximately 85 lbs at 30.60 mm, a spring rate of 9.60 lbs/mm, and a maximum lift capacity around 9.60 mm, this kit is well suited to mild-to-moderate performance upgrades on RB25DE and RB25DET engines. It helps maintain proper valve control under higher rpm and more aggressive camshaft profiles without the complexity of a dual-spring setup.
At Terra Firma Automotive, we supply this genuine Supertech valve spring and titanium retainer kit as a proven upgrade for RB25 owners seeking improved valvetrain stability and high-rpm confidence. Choose Terra Firma Automotive for performance components that support reliable, higher-revving RB25 builds.
- Supertech Single Valve Spring Kit with Titanium Retainers
- Part Number: SPRK-2081-RB25
- Application: Nissan RB25 DOHC with hydraulic lifters
- Compatible with RB25DE and RB25DET engines
- Seat pressure: 85 lbs @ 30.60 mm
- Max lift: approximately 9.60 mm
- Coil bind: 20.70 mm
- Spring rate: 9.60 lbs/mm
- Premium Chrome Silicon Vanadium steel alloy
- Computer-designed for controlled stress and harmonics
- Includes lightweight titanium retainers
- Reduces risk of valve float at higher rpm
- Suitable for mild to moderate performance cam upgrades
- Maintains compatibility with hydraulic lifters
- Available from Terra Firma Automotive
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