Skunk2 Ultra Valve Springs & Base Kit for 16-21 Civic 1.5T

Skunk2 Ultra Valve Springs & Spring Base Kit - 2016-2021 Honda Civic 1.5T

If 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.

What Happens Without the Right Springs

The 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.

Built to Hold Their Pressure

These 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.

The Spring Bases Matter Too

This 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.

Match Them to Your Cam

Before 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.

Specifications

• Installed height: 1.450"
• Seat pressure: 83 lbs
• Open pressure: 215 lbs
• Coil bind: .926"
• Spring rate: 269 lbs/in
• Max lift: .500"

Installation

These 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.

Fitment

• 2016-2021 Honda Civic 1.5T (L15B7)