Tilton Engineering 66-002UGG 7.25" OT-II 2-Plate Metallic Racing Clutch Kit Ultra-High Ratio Double Gray Step

The Tilton Engineering 66-002UGG is a 7.25" OT-II metallic racing clutch kit configured for 2-plate, Ultra-High Ratio (UHR) pressure plate, Double Gray spring, and step-type flywheel applications. Designed for road racing, circle track, open wheel, and formula applications, this clutch delivers the low moment-of-inertia, high torque capacity, and reliability required by the most demanding racing environments.

Key Features:

• Diameter: 7.25" (184mm) OT-II metallic clutch
• Plate Count: 2-plate configuration
• Flywheel Compatibility: Step-type flywheel (0.100" step for friction surface contact)
• Pressure Plate Ratio: Ultra-High Ratio — provides 20% more clamp load and increased diaphragm spring travel (modulation) compared to High Ratio
• Spring Color: Double Gray — rated at 455 lb-ft (619 Nm) of torque capacity per plate (910 lb-ft / 1,238 Nm total for 2-plate)
• Weight: 7.5 lbs (3.4 kg)
• Moment of Inertia (M.O.I.): 66.3 lb-in² (0.0195 kg-m²)
• Open one-piece clutch cover design provides lower operating temperatures, high structural rigidity, and minimal deflection for fast, precise shifting
• Each OT clutch is dynamically balanced and individually inspected for proper assembly
• Compatible Release Bearing: Requires hydraulic release bearing with 1.64" piston (Tilton Part #62-619)

Includes: Cover assembly, Ultra-High Ratio pressure plate, floater plate, and diaphragm spring. Clutch discs and mounting hardware are sold separately.

Note: Metallic racing clutches are intended for competition use only and are not recommended for street use. Requires a step-type flywheel with a 0.100" friction surface step.