7.25″ OT-II Cerametallic Racing Clutches

$510$610

SKU: Select Cerametallic Clutch options below Category:
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Tilton’s 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 Tilton’s 7.25″ OT-II cerametallic racing clutches popular in the following applications:

  • Rally
  • Hill climb
  • Road racing
  • Club racing
  • Off-road
  • Extreme street/strip

Features

  • 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.
  • .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.
  • Individually inspected for proper assembly and balance.

1-Plate 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

"

240/326

"

Ultra-High

Buff

240/326

480/211

High

"

285/388

"

Ultra-High

Orange

280/381

560/247

High

"

335/456

"

Ultra-High

Gray

340/462

680/299

High

"

410/558

"

Ultra-High

Double Gray

380/517

760/334

High

"

455/619

"

Ultra-High

Triple Gray

415/564

800/352

High


2-Plate specifications:
Weight**: 8.2lbs/3.7kg
M.O.I.**: 76.3lb-in2/.0225kg-m2

Spring Color

Torque Capacity
(lb-ft/Nm)

Release Load*
(lbs/daN)

Pressure Plate
(Ratio)

White

400/544

400/180

High

"

480/652

"

Ultra-High

Buff

480/652

480/211

High

"

570/775

"

Ultra-High

Orange

560/762

560/247

High

"

670/911

"

Ultra-High

Gray

680/925

680/299

High

"

820/1115

"

Ultra-High

Double Gray

760/1034

760/334

High

"

910/1238

"

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 offers 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.

Step-Type vs Pot-Type - Clutch Flywheel

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.

Pressure Plate Clamp Load Curve

High Ratio Pressure Plate Header

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

Ultra-High Ratio Pressure Plate Header

  • 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

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 Specs tab to find exact measurements.




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