This is a bit technical, but I will try to explain. The tension of a
valve spring fluctuates at its natural frequency. This often called
"Spring Surge". Generally the two springs will have different natural
frequencies, which helps to smooth out the magnitude of these
fluctuations. If you use a single spring with the same overall tension
as the two springs there is probably not much of a weight difference.
The other advantage of two springs is that you can get a stronger spring
force in a smaller space.
On 10/19/2010 1:40 PM, George Harmuth wrote:
> I've been wondering what's the best approach. I've always run double
> springs as an insurance policy against a broken spring dropping a valve but
> I have to say I've never broken a spring. Are there any other advantages to
> doubles, enough to offset the mass penalty? Neither engine has a
> particularly radical cam, .450 and .470, zero lash, and I don't like to rev
> over 7200. I know springs are made of sterner stuff these days, should I
> use single springs and if so any suggestions?
>
> thanks
> mike
>
> 63 Spitfire
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