I noticed that a lot of performance valve springs are dual - one inside the other. I am clueless of the advantages of this setup. I am curious about the theory behind and the advantages of going this route.

Thanks in advance.

Charles

 

Cars with high redlines use dual valve springs. That's basically what it's for: preventing valve float. If you plan on doing a serious all-motor buildup, go for it. If not, you don't need to bother.

 

no way man! i wouold go with duals either way just safer for high reving hondas just get inners for thr intake and move them to the exhaust side and your set.

 

That still doesn't explain to me why a dual spring setup is superior to a stiffer single spring. I know I may be missing something here, perhaps someone here with some engineering background can help me understand.

Thanks in advance,

Charles

 

in order to make a single spring stiffer, the spring ends up thicker. this limits the amount it can be compressed. And with high lift cams that can be a problem.

By going to 2 stiffer springs you get the same effect, and it can be compressed enough not to limit the travel of the valves.

The above was just a completely educated guess. There may be a better reason.