ACT race discs can be ordered in 4- or 6-pad configurations, either with spring-centered or rigid-hub designs. For larger clutch sizes, ACT recommends 6-pad race discs for more heat capacity and smoother engagement. Race discs with 4 pads engage harsher, yet shift faster, and are better suited for smaller disc sizes.
All Race discs are certified as meeting SFI® Specification 1.1 and are legal in all racing organizations that require SFI® Certification.
Precision-broached splines ensure an exact fit onto the transmission input shaft for long spline life and better clutch release.
Premium ceramic friction materials provide high heat tolerance, high coefficient of friction (µ) and low wear rates.
Thicker retainer stampings for improved strength and reliability.
All drive plates are made from high-carbon spring steel, then heat-treated and zinc-plated to resist bending, cracking, fatigue and corrosion under the most severe racing conditions.
Disc components are manufactured using precision stampings from dedicated tooling, allowing the highest quality and consistency.
ACT spring retainers are designed with wrap-around spring windows to provide additional support and reduce stress concentrations, which eliminate common causes of failure. These improved retainers are found on most ACT Modified and Performance street discs.
Most ACT spring-centered assemblies use bushings and cone or wave springs, similar to factory clutch discs. This creates frictional damping to improve clutch life and reduce noise.
Heavy duty torsional damper springs are typically stronger than standard springs and are engineered to suit each application.
Top grade rivets, carefully selected for maximum strength and toughness, are used to securely fasten the disc assembly.