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A clutch is a mechanism for transmitting rotation, which can be engaged and disengaged.
In everyday use, the term clutch refers to a subcomponent of motor vehicle engine's transmission designed to allow engagement or disengagement of the engine to the gearbox or whatever apparatus is being driven. Invention of the clutch is attributed to Karl Benz.
There are many different vehicle clutch designs, but most are based on one or more friction discs, pressed tightly together or against a flywheel using springs. The friction material is very similar to the material used in brake shoes and pads and used to contain asbestos. Also, clutches found in heavy duty applications such as trucks and competition cars use ceramic clutches that have a greatly increased friction coefficient, however these have a "grabby" action and are unsuitable for road cars. The spring pressure is released when the clutch pedal is depressed thus either pushing or pulling the diaphragm of the pressure plate, depending on type, and the friction plate is released and allowed to rotate freely. A wet clutch is immersed in a cooling lubricating fluid, which also keeps the surfaces clean and gives improved performance and longer life. A dry clutch, as the name implies, uses no fluid. Since the surfaces of a wet clutch can be slippery (as with a motorcycle clutch bathed in engine oil), stacking multiple clutch disks can compensate for slippage. Most Moto Guzzi and BMW motorcycles use a single plate clutch like a car.
In a car it is operated by the left-most pedal using hydraulics or a cable connection from the pedal to the clutch mechanism. No pressure on the pedal means that the clutch plates are engaged (driving), while depressing the pedal will disengage the clutch plates, allowing the driver to shift gears.

Audi Clutch
CenterforceŽ is proud to announce the addition of a clutch upgrade for the Audi TT 1.8T, VW Beetle 1.8T, Golf 1.8T and Jetta 1.8T. This new clutch assembly is engineered to use the 1989 TO 91 225mm CORRADO G60 FLYWHEEL. Centerforce strives to provide the best products on the market at any performance level by constantly testing different materials and designs to find the best combination. This new application is now available as a Dual FrictionŽ clutch assembly to be used from normal street driving to high torque applications. The Dual Friction part number DF038047 (Pressure Plate & Disc included) is now available.
Sports Clutch
Sports Clutch Turboclutch Sport Series clutches offer unmatched value. These clutches are packed with features found in other higher priced units, yet sell for much less. Sport pressure plates have 150 to 200 pounds of extra clamping force to hold the power of your mild upgrades. These upgrades include better exhaust, better intake, cams, chips, and boost controllers.
Sport Series clutch kits are available with both street discs and RPS’s unique sprung hub 6-puck disc. These discs use progressive springs for smoother engagement and inflect much less stress on the transmission than solid hub discs.
“European” style puck material is used exclusively for better drivability and longer life. RPS also has created a special rivet and assembly procedure designed to extend the clutch’s life even more. If you are looking for a great value, this is your clutch!
Carbon Clutch
Carbon Clutch This is the last clutch you will even need for your 2JZ Supra, 300ZX Twin Turbo, and 3000GT VR4. Carbon-carbon is the amazing material used by Top Fuel, Funny Car, Pro Stock and Formula One cars for brakes and clutches. CC will never over heat or glaze over. CC holds more power the hotter it gets and wears at a much lower rate than other materials which makes it ideal not only for drag racing, but also for road racing and hard street use as well.
These are Twin Disc clutches with awesome holding power and ultra smooth engagement. All parts are CNC’ed from aerospace materials and the final assembly is dynamically balanced. These three units utilize highly modified factory pressure plates which helps keep the cost as low as possible. And RPS guarantees that all of the segmented wear surfaces are fully replaceable for the life of your car!

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