Coil Clutch Springs
Coil clutch springs are compression springs which may be used in different types of clutches. Some are used in clutch dampers to control vibrations and sound. The compression springs are compressed by the radial vibrations of a drifting engine. They will be compressed to solid height when the main damper springs take over. Coil clutch springs are also used for vehicular clutches. They are installed in between the diaphragm springs and make the clutch engage and release in the course of changing gears.
To adjust the force of a coil clutch spring spring there are several options. For more force, you may increase the wire diameter, decrease the outer diameter, take some coils out, or add more free length to generate more force through more travel. On the other hand, for less force, you may decrease the wire diameter, increase the outer diameter, add coils, or shorten the free length although shortening the free length is not recommended in these cases since stock coil clutch springs should already be at a length where it is pre-loaded at a minimal distance traveled.