With ER² Clutch Cover Assemblies

Every now and then a genuine innovation comes along for a product that has basically remained unchanged for many years.
Clutch Industries says such an innovation can be found in its performance clutches with its ER2 Groove pressure plate.
4Terrain and Mantic Stage Cover Assemblies include this Patented ER2 Groove Design which is a unique groove pattern that is CNC machined on the friction face of the pressure plate.
This groove has been specifically designed to increase the Mean Effective Radius of the pressure plate and assist in heat removal. The increase in the Mean Effective Radius of the cover assembly gives a significant increase in torque capacity.
By adding the groove to the pressure plate, the inside radius of the friction face has effectively been increased. The first 8mm of the pressure plate has all but been removed and added to this, there is progressively less material removed as the radius increases.

The net effect of this is to move the effective inside radius further out. When comparing the Mean Effective Radius (Rm) of the ER2 version to the non ER2 version, you can see the ER2 version is further out (left above).
Clutch Industries explains that moving the Rm out has the effect of increasing the surface area of the clutch which increases the torque capacity. Torque capacity is directly related to Rm, so the greater Mean Effective Radius the higher the toque capacity.
Clutch Industries states that this Australian engineered innovation gives 4Terrain and Mantic clutches an advantage over other performance clutch systems while not compromising on drivability or durability.

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