Increasing Surface Area

Increasing Surface Area


Increasing the size or the surface area of a clutch increases the torque capacity of the system, however unlike brakes you’re generally not able to simply install a larger clutch. There are two methods that are used by performance clutch manufactures to increase the surface area;

Multiple Plates

Installing twin or triple plates in most cases can be done without modifying the bellhousing and can double or triple the torque capacity without having a detriment to the drivability. The Mantic Track series has a range of twin and triple plate kits which feature several different plate options to suit various applications from street to track.

ER² Groove

This groove is a patented system that 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 5/16 inches(7.9375mm) of the pressure plate has all butbeen 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.

The Mean Effective Radius of the clutch is directly proportional to the torque capacity of the system. Therefore as the Mean Effective
radius increases so does the Torque Capacity of the clutch. This system can be found in both the Mantic and 4Terrain performance clutch range.




Friction Material

Changing the friction material on a clutch disc can increase the torque capacity and can improve the thermal properties. Common clutch disc materials are;

Organic – Most commonly used on OE applications this material is great for drivability but is not suited for
high performance applications due to poor torque capacity when hot.

Aramid – Generally a mixture of organic and aramid this compound has the drivability of standard organic material with much higher torque capacity and better heat resistance. Found in 4Terrain Ultimate this material is perfectly suited to 4WD applications where higher performance is needed without any compromise to drivability.

Cerametallic/Ceramic – Suited to high performance or race applications this material can handle a high level of heat while also giving a massive increase in torque capacity (66% increase
over organic material). Unfortunately, the drivability is significantly decreased as the material gives a more aggressive engagement than organic material. This material can be found in the Mantic performance range.