Quick question.

[Jahee]

What are the springs i see around the inner of the plate in this picture for? I'm guessing some kind of vibration dampers?
Also, same for the haxagonal teeth on the inner of the clutch cover?

 

[CRXican]

Sprung vs. Unsprung

Which is better, depends on usage. For any performance application I always recommend un-sprung. Would you want a one piece hammer or a three piece hammer connected by springs? If you want something fail safe then unsprung is the way to go. The reason why there are springs in the hub is not to prevent chatter. Chatter is a engagement property and is mostly dictated by the friction material used. The springs in the clutch disc prevent crank vibrations (piston engines have jerky rotational motion due to combustion) from entering the transmission. This is the principal behind sprung hubs. In practice I have yet to see any ill effects of running un-sprung hubs. I've taken apart a few transmissions and have not noticed anything unusual. It's not like I've opened up a tranny and say look Bob, this is what happens when you run a unsprung disc. I just haven't found any signs of bad effects. Now if you want your tranny to last 200-300k miles then I would choose to run a sprung disc. If not the lighter un-sprung disc is my choice.

www.m24x.com/clutch101.htm

See also:

http://forums.evolutionm.net/e...k-sprung-unsprung.html

 

[Jahee]

Ok, thanks for clearing that up.. What about the teeth on the clutch cover?

 

[Howard]

That's the diaphragm spring which provides the clamping force on the friction surfaces.