Spec Clutch SF46A Aluminum Flywheel SFI-Certified CNC Billet

The Spec Clutch SF46A is a precision-engineered aircraft-quality billet aluminum flywheel designed for performance street and competition use. CNC machined to an exceptional .001-inch tolerance — ten times tighter than the industry standard of .010 — this flywheel delivers perfect rotational balance and a perfectly flat clutch disc bedding surface, critical for both performance and safety in demanding driving environments. The SF46A carries SFI certification, making it suitable for sanctioned motorsport competition.

Key Features:

• CNC machined from aircraft-grade billet aluminum for a lightweight, high-strength construction
• Manufactured to .001-inch tolerance — 10x tighter than the industry standard
• SFI certified for use in sanctioned racing events
• Rebuildable design with a replaceable steel friction plate for extended service life
• Replaceable friction plate is made from friction-enhancing steel specially formulated for optimum clutch bedding and holding power
• Precision balance eliminates dimensional runout, preventing engine-damaging vibrations and power loss
• Optimized Moment of Inertia (MOI) engineered by Spec for maximum power output and drivability

The flywheel is one of the most critical components in the drivetrain, performing three essential roles: providing a consistent friction surface for the clutch disc, contributing the correct rotational inertia to optimize power-to-acceleration ratios, and maintaining true rotational balance at all RPM levels. Spec's aluminum construction reduces rotating mass compared to steel flywheels, allowing the engine to rev more freely — ideal for high-revving performance and race applications.

Spec invests heavily in research and development to engineer optimal flywheel dimensions and weights across a broad range of driving and racing applications. The SF46A's lightweight aluminum construction and rebuildable friction plate make it a cost-effective, high-performance upgrade for serious enthusiasts and competitors alike.