Clutch

A clutch is a mechanical device that is use to limit the amount of torque being sent from driving to driven,  that is why it is so important to upgrade the clutch to prevent slipping when the engine is upgrade to more power.
In cars clutched are used to free up the transmission from the motor so that the motor keep revving when the gear is being changed.


How it works

http://autorepair.about.com/library/a/1i/bl201i.htm
The flywheel is bolt on to the crank, clutch disk is bolt on to the flywheel and the pressure plate is bolt on to the flywheel aswell. Through it all is the drive shaft (from the crank out put) which is where the clutch paddle thrust bearing is ( infront of the the pressure plate). When the clutch paddle is press the clutch thrust bearing depresses the inner pressure plate which in turn leavers up the outer pressure plate lifting it off the clutch disk.