balancing act. If clamp load and torque capacity ratings are increased too much, component failure will likely occur in other areas such as the mechanical or hydraulic linkage. If these ratings are increased too little, the components will simply fail when subjected to the added operating demands.

Heavy-Duty Upgrades

Heavy-duty SR Kits are engineered for activities such as towing, hauling, snow removal, commercial use, and off-road use. They feature beefier diaphragm or coil springs for increased clamping power, heavier gauge components, and alternative friction material compounds.

High-Performance Upgrades

High-performance SR Upgrades are engineered primarily for modified street use. They feature ductile iron castings along with performance grade components like chrome vanadium springs and heat treated pins, levers, yokes, and eyebolts.  Spring pressure is also increased for added clamping power. The results are quick-clean engagement and longer life along with increased resistance to higher rpm’s and operating temperatures.

Heavy-duty and high-performance SR Kits are available in three different levels or  “series” called SR100, SR200, and SR300. Each series is engineered to meet distinctly different torque, horsepower, and usage requirements.

Series 100

SR100 Kits are designed for applications in which a mild improvement in clutch capacity is required. Organic friction material is utilized in order to provide drivability characteristics that are similar to the stock clutch. The organic material is usually bonded to a steel backing plate yielding higher burst capacity. SR100 Kits yield minimal mating surface wear and are therefore ideal for drivers with limited manual transmission experience.

Series 200

SR200 Kits are designed for applications in which a significant improvement in clutch capacity is required. Kevlarâ or High Density Aramid friction material is utilized in order to provide engagement characteristics that are similar to the stock clutch. Nevertheless, the coefficient of friction rating for Kevlar â is 30% higher than O.E. organic facing material. Kevlar â material offers less mating surface wear than sintered metallic material.

Series 300

SR300 Kits are also designed for applications in which an extreme improvement in clutch capacity is required. Miba sintered metallic friction material is utilized in order to provide the highest coefficient of friction, although mating surface wear is increased and drivability is more abrupt. As a result, SR300 Kits are not recommended for drivers with limited manual transmission experience.

Keep in mind that friction material is one of the primary factors in determining the longevity and drivability of any clutch system. Recommendations for friction material choice are largely determined by operating conditions and desired driving characteristics. Application specific information can be referenced in AMS cataloging.

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