valve springs

what is the spring that is inside the valve spring for?:finger:

:) hi debs im baker i dont know what the springs for but hi anyway!

Basically to control the valvetrain spring surge, the springs need to deliver enough force to resist the inertia of all the valvetrain parts right? If the springs cannot control there own mass, then they certainly can't control the rest of the parts. Spring surge is when the spring vibrates at it's resonate frequency and looses all control. Running more than one spring can resist spring surge. On a dual spring set up there will be a smaller spring inside a larger one, each spring having a different resonate frequency. If designed correctly they can be wound in opposite directions and fit snugly enough have some of the dampening qualities of a flat wound damper. Or a flat wound damper could be fitted between the two springs for even better dampening. Even better yet, you can use two variable rate springs with a damper and probably never have a surging problem! It all depends on how much you have to spend. Hope I helped you out deb.