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Tilton 7.25" OT-II Cerametallic Racing Clutch Covers

Tilton 7.25'' OT-II  Cerametallic Racing Clutch Covers
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 Plate Count: Single PlatePlate Count: Twin Plate 
Price:  $471.75(Exc. 7% Sales Tax - GA only)
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Part Number:  66-301HW

Tilton

Installation Instructions (PDF)
Installation Drawing (PDF)

Tiltonís 7.25″ OT-II cerametallic racing clutches are primarily designed for racing applications where some clutch modulation is desired. They feature 4-paddle discs that incorporate a unique blend of ceramic and metallic materials. Cerametallic discs are thicker than sintered metallic discs, and they provide higher heat capacity through their increased mass. In addition, the engagement characteristics of cerametallic clutches are smoother than sintered metallic clutches. These features make Tiltonís 7.25″ OT-II cerametallic racing clutches popular in the applications below:

  • Rally
  • Hill Climb
  • Road Racing
  • Club Racing
  • Off-Road
  • Extreme Street/Strip
  • Open, one-piece clutch cover design. Provides lower operating temperature, higher strength and minimized deflection for quick shifting
  • Five diaphragm spring rate options. Provides a wide range of torque capacities and release loads to tune the clutch for the application
  • Chrome vanadium diaphragm springs and an engineered pressure plate geometry. Provides a high clamp load-to-wear ratio, low release load and quick shifting
  • High-strength steel pressure and floater plates. 0.283″ thick friction disc. Provides excellent wear resistance and withstands elevated temperatures
  • Hardened steel thrust buttons provide a smooth and durable surface for pressure and floater plates
  • Dynamic spin balanced and individually inspected for proper assembly and balance
  • Tilton uses a color system for indicating the angle and weight of the clutch spring, which has an effect on release load and torque capacity for the clutch. The exact values for each color vary depending on the type of clutch, so be sure to check the charts below to find exact measurements.

    Single Plate Clutch Specifications:
    Weight**:  5.6 lbs / 2.5 kg
    M.O.I.**:  52.4 lb-in2 / .0154 kg-m2

    SPRING COLOR TORQUE CAPACITY (LB-FT/NM) RELEASE LOAD* (LBS/DAN) PRESSURE PLATE (RATIO)
    WHITE 200/272 400/180 HIGH
    WHITE 240/326 400/180 ULTRA-HIGH
    BUFF 240/326 480/211 HIGH
    BUFF 285/388 480/211 ULTRA-HIGH
    ORANGE 280/381 560/247 HIGH
    ORANGE 335/456 560/427 ULTRA-HIGH
    GRAY 340/462 680/299 HIGH
    GRAY 410/558 680/299 ULTRA-HIGH
    DOUBLE GRAY 380/517 760/334 HIGH
    DOUBLE GRAY 455/619 760/334 ULTRA-HIGH
    TRIPLE GRAY 415/564 800/352 HIGH


























    Twin Plate Clutch Specifications:

    Weight**:  8.2 lbs / 3.7 kg
    M.O.I.**:  76.3 lb-in2 / .0255 kg-m2

    SPRING COLOR TORQUE CAPACITY (LB-FT/NM) RELEASE LOAD* (LBS/DAN) PRESSURE PLATE (RATIO)
    WHITE 400/544 400/180 HIGH
    WHITE 480/652 400/180 ULTRA-HIGH
    BUFF 480/562 480/211 HIGH
    BUFF 570/775 480/211 ULTRA-HIGH
    ORANGE 560/762 560/247 HIGH
    ORANGE 670/911 560/427 ULTRA-HIGH
    GRAY 680/925 680/299 HIGH
    GRAY 820/1115 680/299 ULTRA-HIGH
    DOUBLE GRAY 760/1034 760/334 HIGH
    DOUBLE GRAY 910/1238 760/334 ULTRA-HIGH
    TRIPLE GRAY 830/1129 800/352 HIGH

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    * Values listed are typical for release bearings with the recommended 44mm contact diameter. Larger contact diameters will increase release load.

    ** Weight and M.O.I. include pressure plate, carbon floater plates, carbon discs and steel hub, and may vary based on your particular spline.

    Tilton offer two different styles of every clutch configuration: one designed to be compatible with a step-type flywheel and another for pot-type (“no-step”) flywheels. Step flywheels have a .100″ step for contact with the friction material of the clutch, so clutches made for this application will have a .100″ height difference between the bottom friction disc and the end of the clutch cover legs (the mounting points). Pot flywheels don’t have this step, so the friction disc and clutch cover legs will be flush on clutches designed for them.

    Tilton’s cerametallic clutches are available with either a High Ratio or Ultra-High Ratio pressure plate. High Ratio pressure plates offer high clamp load over a wide wear range, while Ultra-High Ratio pressure plates provide 20% more clamp load and diaphragm spring travel (modulation). As seen on the graph below, the clamp load (or torque capacity) of the High Ratio pressure plate is relatively flat until .030″ (0.76mm) of wear; Ultra-High Ratio pressure plates offer a higher initial clamp load at a faster wear rate.



    • Standard pressure plate ratio for Tilton cerametallic clutches
    • Short release travel for quick engagement and faster shifting
    • Flat clamp load curve for longest wear range

    • 20% more release travel than High Ratio for improved modulation
    • 20% more clamp load than High Ratio for higher peak torque capacity
    • Clamp load drops more quickly with wear than High Ratio