4TERRAIN ULTIMATE

More than a Heavy Duty Clutch

Category Manager for Clutch for Repco and GPC Asia Pacific, Josh Strang, said the 4T Ultimate with patented ER² Groove Design has a number of features which make the product distinctly new.
It is comprised of a cover assembly, clutch disc and release bearing while some kits also include a solid replacement flywheel (or DMR).
The cover assembly incorporates a premium corrosion resistant surface finish, which exhibits excellent resistance to oxidation over a prolonged period of time. In addition the clutch pressure plate incorporates 4T Ultimate’s exclusive ER2 design technology.
The cover assembly’s pressure plate is manufactured from Spheroidal Graphite casting material and has a yield strength some 300 percent higher than standard castings, says Josh. The materials’ microstructure also improves heat dispersion. The cover assembly incorporates greater clamp load than a standard cover assembly, and this translates to more torque capacity.
Further, the kit’s clutch disc has a unique flywheel side friction material. The Aramid friction material exhibits 50 percent less wear than a conventional clutch disc’s friction material. This material also reduces the effects of clutch fade – the decline in the clutch system’s ability to transmit torque as operating temperatures increase.
These features in combination with the previously mentioned microstructure of spheroidal graphite casting and ER² Technology allows the clutch kit to dissipate heat far more effectively, allowing the clutch to run cooler for longer.
It also means that the clutch system is capable of transmitting greater than 60 percent more torque than a standard Clutch Kit making it suitable for demanding conditions. This overall Torque Capacity increase has been achieved by higher Clamp Loads, increased Mean Effective Radius of the pressure plate, better cooling and higher coefficient of friction materials on the Clutch disc.
The patented pressure plate with ER² grooves are precision machined with CAD/CAM technology. The design enhances the performance in two ways, says Josh. Firstly it increases the torque capacity of the cover assembly 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 which again enhances the torque capacity of the clutch.

For more information, visit www.repco.com.au