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Thread: 30 degrees of advance at idle?
          
   
   

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  1. #2
    Frisco is offline CHR Member Visit my Photo Gallery
    Join Date
    Sep 2006
    Location
    Canton
    Car Year, Make, Model: 1931 Ford Roadster
    Posts
    46

    Quote Originally Posted by pnut
    I was reading a very good article which made sense to me which I will use when tuning my SBC with Qjet (I think follows what Denny recommends, I'll let him comment on that):
    http://www.73-87.com/7387garage/drivetrain/hei.htm

    With the above setup, it will yield 30 degrees of advance at idle, that sounds very high. I have not tried it yet, just seems very high.

    I have bought the Crane kit and installed it, but have not run the engine yet.(I just discovered my NEW China-Ebay HEI's vacuum advance canister diaphram was broken).
    Your link does NOT work.

    Tried the link again and it worked this time. Good article! Read my first sentence below.

    30 degrees BTDC at idle is very excessive unless you are checking the timing with the vacuum advance connected to full manifold source at the time.

    Your timing (both initial and Total mechanical) is checked and set with the vacuum advance disconnected and plugged.

    The Total Mechanical (initial plus the built in mechanical advance) should not exceed 40 degrees. You will see figures above 40 degrees if you have the vacuum advance hooked up when checking.
    Last edited by Frisco; 04-12-2007 at 06:40 AM.

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