![]() Whenever a clutch is engaged (slipped) it generates heat. Heat capacity refers to the amount of heat the clutch can withstand before damage or failure occurs. One can usually use the torque ratings to compare clutches from the same manufacturer, but not from different manufacturers. On the other hand, another clutch manufacturer may rate a clutch at the torque level it starts to slip in an effort to provide a more impressive rating. ![]() Generally, a Tilton OT-Series clutch does not slip until the torque is 50% above the rated torque capacity, making the rating rather conservative. Racing clutch manufacturers do not have an industry standard with which they set clutch torque ratings. Torque capacity ratings among clutch manufacturers cannot be directly compared. Torque capacity refers to the engine torque that the clutch will hold before slippage occurs. Understanding what limits clutch performance: Torque capacity and heat capacity are the two main factors that limit clutch performance.Racing clutch friction materials, as far as the rules are concerned, are divided into two categories: metallic and carbon/carbon. ![]() In addition, rules typically specify acceptable clutch friction materials. The minimum clutch diameter rule is based on the diameter of the friction/driven discs, not the diameter of the entire clutch. Most sanctioning bodies rules specify a minimum clutch diameter. Choosing a clutch that fits your sanctioning body rules: It all starts with what clutches are legal for use in your racing series.In short, there is a trade-off to be made between weight and maintenance intervals. Removing one plate from the clutch will increase engine performance, but long-term clutch life may be reduced. Another option to adding a plate is to select a larger diameter clutch. Adding an additional plate to the clutch may increase initial cost by 30% while doubling the life of the clutch. How clutch selection effects durability: How often do you want to look at the clutch? Do you not want to look at it for another two seasons of racing? Or, are you going for the championships and are willing to perform the extra maintenance required on the lightest assembly available? These are two different clutches.Below is a list of factors to consider when choosing the right clutch. After you find your selected clutch diameter you should determine how many discs it takes to meet your engine's torque capacity then add one extra disc for heat capacity and durability. ![]() The general rule for selecting a racing clutch is to choose the smallest clutch diameter allowed by sanctioning body rules. The selection of clutches on the market is quite large, with a wide range of diameters, friction materials and disc counts. There are many considerations when choosing a clutch that best meets your needs. ![]()
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