Quarter Master

Quarter Master: Race-Proven Driveline Performance

Since 1972, Quarter Master® has been one of motorsport's most trusted names in high-performance driveline engineering. What began as a focused pursuit of superior clutch technology has grown into a comprehensive lineup that covers virtually every link in the drivetrain — from the flywheel to the starter. Quarter Master clutch kits are the cornerstone of that legacy, engineered with premium internal friction material and optimized moment of inertia for quick, reliable power transfer under the most demanding race conditions.

Quarter Master's product development philosophy is rooted in close collaboration with professional racers across disciplines. The brand serves a broad spectrum of motorsport applications, including asphalt short track, dirt short track, open wheel, road racing, driving schools, and NASCAR. That real-world feedback loop — from the garage to the track and back again — informs every component Quarter Master produces, ensuring that engineering advancements translate directly into lap times.

Engineering Excellence at Every Stage of the Drivetrain

At the heart of any manual drivetrain is the flywheel, and Quarter Master clutch flywheels are designed to match perfectly with the brand's clutch systems. Precision-machined for balance and durability, these flywheels help reduce rotating mass while maintaining the strength needed to withstand repeated high-rpm engagements. Whether you're running a circle track late model or a performance street build, getting the flywheel right is foundational.

Smooth clutch engagement depends just as much on what surrounds the clutch as the clutch itself. Quarter Master clutch release bearings — including their hydraulic street release bearing line — are designed to interface seamlessly with the brand's clutch assemblies, delivering consistent, precise actuation lap after lap. Paired with properly matched hardware, these bearings help eliminate the guesswork that can plague mixed-brand drivetrain builds.

Quarter Master's commitment to full-system driveline solutions extends to supporting components like the manual transmission bearing retainer and starter drives. The brand's Ultra-Duty starters are engineered specifically to work with Quarter Master bellhousings and ring gears — a level of system-level integration that reduces compatibility issues and keeps racers focused on performance rather than fitment.

Built with State-of-the-Art Manufacturing

Every Quarter Master component is produced on sophisticated CNC equipment and developed using advanced engineering tools including SOLIDWORKS modeling and finite element analysis (FEA). This commitment to precision manufacturing means tighter tolerances, more consistent performance, and parts that hold up across a full season of racing. For racers who demand the best from their drivetrain, Quarter Master delivers a complete, cohesive system backed by decades of track-proven results.