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  • bravenrace

    Dec. 3, 2010 8:30 a.m. bravenrace SuperDork

    Anybody know a good manual formula for calculating primary tube and collector diameter?

  • oldeskewltoy

    Dec. 3, 2010 12:01 p.m. oldeskewltoy Reader

    http://www.google.com/search?q=header+calculators&sourceid=ie7&rls=com.mic...

  • TJ

    Dec. 3, 2010 12:02 p.m. TJ SuperDork

    pasted from here

    "You can roughly calculate primary internal diameter with this formula: ID = (The square root of cc/(P+3) x 25) x 2.1 Where: ID = Inside Diameter cc = Cylinder Volume in cc P = Primary Length

    Having a tube with a slightly larger cross sectional area than the exhaust port is a decent starting point as well."

  • TJ

    Dec. 3, 2010 12:20 p.m. TJ SuperDork

    another link

  • Paul_VR6

    Dec. 3, 2010 12:50 p.m. Paul_VR6 Reader

    Fill out the Burns header sheet and have them give it to you.

 
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