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valve spring question

Discussion in 'Turbo Tech Questions' started by 70wayfarer, Sep 23, 2015.

  1. 70wayfarer

    Joined:
    Apr 21, 2014
    hey guys...may seem a dumb question, but do i need to look at increased valve spring pressure for boost. i know i need to upgrade the springs that came on my new eddy heads. it's a 360/410 sbm s475 looking at 18 ish psi max boost.

    cheers
     
    70wayfarer, Sep 23, 2015
    #1

  2. turbomalibuwagon

    Joined:
    May 5, 2015
    Not really, spec the springs for the cam and go for the stiff side of the spec you will be fine.
     
    turbomalibuwagon, Sep 23, 2015
    #2

  3. Mnlx

    Joined:
    Sep 20, 2009
    This is how I have always looked at it.... 18 psi on the back of a 2" intake valve will be trying to open the valve with approx 55 lb's of force, so I look for a spring that adds somewhat close to that in pressure. I'm sure its more complicated than that, but has worked so far.
     
    Mnlx, Sep 23, 2015
    #3

  4. 70wayfarer

    Joined:
    Apr 21, 2014
    cool, thanks guys.....read somewhere that boost can push a closed intake valve open if it has not enough closed seat pressure.
    cheers
     
    70wayfarer, Sep 23, 2015
    #4
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