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Ported vs manifold vacuum advance

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  • #16

    Re: Ported vs manifold vacuum advance

    I just found this topic and wanted to throw in my two cents.
    On another forum their resident genius recommends manifold vacuum also.
    I set my idle timing at 15 BTDC and then plugged in the manifold vacuum and got 36 degrees at 2800rpms for a total of 53 degrees.
    My car idles better, instant throttle response and the temp dropped 20 degrees!
    My cam is a Comp Cams 475 lift, 276/284 duration cam,.
    So then I used no vacuum and uped the idle and what I used to think was right was nothing more than a rough running surging at all speeds dog.
    Last edited by skullbucket; May 12th, 2012, 06:58 AM.