{"product_id":"supertech-nissan-skyline-rb25-dohc-24v-w-hydraulic-lifters-single-valve-spring-kit-for-nissan-skyline-rb25-sptsprk-2081-rb25","title":"Supertech Performance Single Valve Spring Kit With Titanium Retainers For A Nissan RB25 DOHC Hydraulic Lifter (85Lbs Seat Pressure) SPRK-2081-RB25","description":"\u003cp dir=\"auto\"\u003eHigher 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.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThese 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.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eWith 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.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eAt 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.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSupertech Single Valve Spring Kit with Titanium Retainers\u003c\/li\u003e\n\u003cli\u003ePart Number: SPRK-2081-RB25\u003c\/li\u003e\n\u003cli\u003eApplication: Nissan RB25 DOHC with hydraulic lifters\u003c\/li\u003e\n\u003cli\u003eCompatible with RB25DE and RB25DET engines\u003c\/li\u003e\n\u003cli\u003eSeat pressure: 85 lbs @ 30.60 mm\u003c\/li\u003e\n\u003cli\u003eMax lift: approximately 9.60 mm\u003c\/li\u003e\n\u003cli\u003eCoil bind: 20.70 mm\u003c\/li\u003e\n\u003cli\u003eSpring rate: 9.60 lbs\/mm\u003c\/li\u003e\n\u003cli\u003ePremium Chrome Silicon Vanadium steel alloy\u003c\/li\u003e\n\u003cli\u003eComputer-designed for controlled stress and harmonics\u003c\/li\u003e\n\u003cli\u003eIncludes lightweight titanium retainers\u003c\/li\u003e\n\u003cli\u003eReduces risk of valve float at higher rpm\u003c\/li\u003e\n\u003cli\u003eSuitable for mild to moderate performance cam upgrades\u003c\/li\u003e\n\u003cli\u003eMaintains compatibility with hydraulic lifters\u003c\/li\u003e\n\u003cli\u003eAvailable from Terra Firma Automotive\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Supertech","offers":[{"title":"Default Title","offer_id":31311469379646,"sku":"sptSPRK-2081-RB25","price":777.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1992\/7247\/products\/SPRK-1012S-RB25_93591dd7-b043-4c7e-989c-c701f17b41d1.png?v=1574888751","url":"https:\/\/tfaspeed.com\/products\/supertech-nissan-skyline-rb25-dohc-24v-w-hydraulic-lifters-single-valve-spring-kit-for-nissan-skyline-rb25-sptsprk-2081-rb25","provider":"Terra Firma Automotive","version":"1.0","type":"link"}