4Terrain Ultimate (Mantic) ER2, 4WD Heavy Duty Clutches with ER2 Groove Design

2017 - Clutch Industries Pty have brought the Mantic ER2 clutch under the 4Terrain branding inline with similar products, the clutch is still the same product we knew as "Mantic" but it just has different branding.

The 4Terrain Ultimate ER2 4WD Clutch kit is capable of transmitting up to 60% more torque than a standard Clutch Kit, making it suitable for high performance vehicles. The Torque Capacity increase has been achieved by the following, these design innovations directly equate to higher torque capacity;

1. Patented “ER2 Groove Design” pressure plate
2. Higher Clamp Loads
3. Increased Mean Effective Radius of the disc friction area
4. Better cooling of the pressure plate
5. Higher coefficient of friction materials on the Clutch disc

4Terrain Ultimate ER2 4WD Heavy Duty Clutches are produced by Clutch Industries, Australia. The patented “Groove design” on the ER2 pressure plate makes 4Terrain Ultimate ER2 the most advanced 4WD clutch available.

The clutch kit comprises of an ER2 cover assembly, a clutch disc and a release bearing. These are supplied in a unique wooden Army style “ammo” box, that has many uses after you fit the clutch.

Cover Assembly

The cover assembly incorporates a premium corrosion resistant surface finish which exhibits excellent resistance to oxidation over a prolonged period of time.

Cover Assembly Pressure Plate

The cover assembly’s pressure plate is manufactured from Spheroidal Graphite casting material which has a yield strength 300% higher than standard castings. The materials microstructure also improves heat dispersion. The cover assembly also incorporates greater clamp load than a standard cover assembly. This translates to more torque transfer. This casting material has not been used in this application previously and is especially useful in 4WD applications where higher clutch operating temperatures and load transfer are experienced and required i.e. Purposeful clutch system slipping for off-road situations, towing and maneuvering external vehicle payloads like trailers and caravans.

The Patented pressure plate with ER² grooves are precision machined with CAD/CAM technology. The design enhances the performance in 2 ways. Firstly it increases the torque capacity of the cover assembly by up to 8% and secondly it assists with cooling which in-turn enables the friction material to operate at lower temperatures and therefore at a higher coefficient of friction. Again this enhances the torque capacity of the clutch.

By adding the groove to the pressure plate, the inside radius of the friction face has effectively been increased. The first 5/16 inches 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. This increases the torque capacity of the clutch. Torque capacity is directly related to Rm.

Clutch disc

The clutch kit’s clutch disc has a unique flywheel side friction material. The Aramide friction material exhibits 50% less wear than a conventional clutch disc’s friction material. This material also reduces the effects of fade. Fade is the decline in the clutch system’s ability to transmit torque as the operating temperature increases. This feature in combination with the previously mentioned microstructure of spheroidal graphite casting allows the clutch kit to dissipate heat far more effectively, allowing the clutch to run cooler for longer. The aramide friction material is arranged on the flywheel side of the clutch disc in a segmented fashion. The arrangement of the geometric form of each of the segments increases the Mean Effective Radius (Rm) of the clutch disc. By increasing the Rm the transmittable torque of the clutch increases.

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