{"product_id":"skunk2-ultra-valve-springs-and-spring-base-kit-for-2016-2021-honda-civic-15t","title":"Skunk2 Ultra Valve Springs \u0026 Base Kit for 16-21 Civic 1.5T","description":"\u003cul\u003e\n\u003cli\u003eCrafted from high tensile strength chrome-silicone wire \u003c\/li\u003e\n\u003cli\u003eEnables significant cam lift beyond OEM capabilities \u003c\/li\u003e\n\u003cli\u003eEssential for high-performance engine builds \u003c\/li\u003e\n\u003cli\u003eIncludes everything needed for installation \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- split --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#Description\"\u003eDescription\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"#VehicleFitment\"\u003eVehicle Fitment\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#TechnicalData\"\u003eTechnical Data\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#InstallGuide\"\u003eInstall Guide\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\n\n\u003cli class=\"active\" id=\"Description\"\u003e\n\u003ch3\u003eSkunk2 Ultra Valve Springs \u0026amp; Spring Base Kit - 2016-2021 Honda Civic 1.5T\u003c\/h3\u003e\n\n\u003cp\u003eIf you're putting a high-lift cam in your 1.5T, the valve springs aren't optional, and here's why. A valve spring's whole job is to slam the valve shut and keep the valvetrain pinned against the cam lobe the entire time the engine's running, and at high RPM that's a brutal ask. The factory springs were tuned around the factory cam and the factory rev limit, so the moment you ask them to control a more aggressive cam opening the valve further and faster, they can't keep up. This Skunk2 Ultra kit is what you put in instead, with stronger springs and the matching spring bases to set everything up right on the L15B7.\u003c\/p\u003e\n\n\u003ch4\u003eWhat Happens Without the Right Springs\u003c\/h4\u003e\n\n\u003cp\u003eThe failure you're trying to avoid is called valve float. When a spring isn't strong enough to snap the valve closed in time, the valvetrain loses contact with the cam lobe and the valve stops following the motion it's supposed to, which costs you power right at the top of the rev range where you actually wanted it. In the worst case the valve hangs open a hair too long and the piston catches it, and now you're looking at bent valves and a hurt engine. That's exactly why a high-lift cam calls for upgraded springs, and it's why these aren't a nice-to-have but a required part of the build. Get them in and the valves stay in control no matter how hard you're revving it.\u003c\/p\u003e\n\n\u003ch4\u003eBuilt to Hold Their Pressure\u003c\/h4\u003e\n\n\u003cp\u003eThese are wound from super-clean, high-tensile chrome-silicon wire, then shot-peened and heat-treated, and that combination is really about one thing: keeping the spring doing its job over the long haul. The shot peening relieves the surface stress that would otherwise start a crack, and the heat treatment keeps the spring rate consistent so the pressure you set on day one is still there after thousands of miles of hard use. A spring that goes soft or lets go is how valve float sneaks back in, so the quality of the material and the processing genuinely matters here.\u003c\/p\u003e\n\n\u003ch4\u003eThe Spring Bases Matter Too\u003c\/h4\u003e\n\n\u003cp\u003eThis is a full kit, not just springs, and the included spring bases are the reason that's worth noting. Running a different spring means you need to land on the correct installed height for everything to work the way it should, and the bases that come in the box are what let you set that up properly on the 1.5T head. You're getting a matched package rather than piecing it together and hoping the geometry works out.\u003c\/p\u003e\n\n\u003ch4\u003eMatch Them to Your Cam\u003c\/h4\u003e\n\n\u003cp\u003eBefore you buy, look at the numbers against your cam. These springs are rated for up to .500 inches of lift, and they reach coil bind, the point where the coils stack solid and can't compress any further, at .926 inches. You always need clearance between your cam's actual lift and that coil bind figure, so confirm your camshaft's lift falls within what these springs are built for. As long as your cam is in that range, you've got the right spring for the job.\u003c\/p\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\n\u003cul\u003e\n    \u003cli\u003eInstalled height: 1.450\"\u003c\/li\u003e\n    \u003cli\u003eSeat pressure: 83 lbs\u003c\/li\u003e\n    \u003cli\u003eOpen pressure: 215 lbs\u003c\/li\u003e\n    \u003cli\u003eCoil bind: .926\"\u003c\/li\u003e\n    \u003cli\u003eSpring rate: 269 lbs\/in\u003c\/li\u003e\n    \u003cli\u003eMax lift: .500\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation\u003c\/h4\u003e\n\n\u003cp\u003eThese go in as a direct replacement for the OEM springs with no head machining or modifications needed, but valve spring work is still valvetrain work, so it's a job for the right tools and a careful hand. However you do it, check your installed height and verify you've got clearance between your cam's max lift and coil bind before you button the head back up. The kit is backed by Skunk2 Racing's standard limited warranty.\u003c\/p\u003e\n\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\n\u003cul\u003e\n    \u003cli\u003e2016-2021 Honda Civic 1.5T (L15B7)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n    2016-2021 Honda Civic 1.5T \n\u003c\/li\u003e\n\n\n\n\n\u003cli id=\"TechnicalData\"\u003e\nMaterial: Chrome-Silicone Wire, Seat Pressure: 83 LBS, Open Pressure: 215 LBS, Coil Bind: .926”, Spring Rate: 269 LBS\/IN, Max Lift: .500”\n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\u003cli id=\"InstallGuide\"\u003e\nInstallation is straightforward but should be performed by a professional to ensure proper fitment and functionality. Compatible with high-lift performance camshafts.\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n","brand":"Skunk2 Racing","offers":[{"title":"Default Title","offer_id":69773232865314,"sku":"SK2-313-05-9400","price":332.45,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/313-05-9400_1.jpg?v=1794442288","url":"https:\/\/www.hybrid-racing.com\/products\/skunk2-ultra-valve-springs-and-spring-base-kit-for-2016-2021-honda-civic-15t","provider":"Hybrid Racing","version":"1.0","type":"link"}