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  1. #1
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    Achievements Checkered FlagWide Open ThrottleBurning TiresStepping on the GasBuckling Up

    Default What happens with no vacuum advance?

    A person here in Mountain Home Id suggested if the vacuum was over 40* at 2500 RPM, to disconnect the vacuum advance from the dizzy. What's your opinion?

  2. #2
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    Achievements Checkered FlagWide Open ThrottleBurning TiresStepping on the GasBuckling Up

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    The reason I asked this question is at 17.4* initial timing and when I go up to 2500 rpm the total advance is 54.4*. That's a 37* increase.
    Last edited by 78 elk; 06-11-2017 at 01:31 PM.

  3. #3
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    Achievements At the Starting LineChecking the GaugesKicking the Tires

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    you might be able to use stiffer centrifugal weights in the distributor to keep total advance in check

  4. #4
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    Achievements Checkered FlagWide Open ThrottleBurning TiresStepping on the GasBuckling Up

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    Thank you. I'll see what I can find.

  5. #5
    Known Member Francis Steele's Avatar
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    Achievements Checkered FlagWide Open ThrottleBurning TiresStepping on the GasAt the Starting Line

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    Some cars do not have vacuum advance the have electronic built in to the distributor if you are getting 40* at 2500 is it pinging bad that sound way to much. We had a race car some years ago that only had 32 to 34 total advance at 5500 RPM . And it was 11 to 1 pistons with a 355 cubic inch chevy we had a 525 lift on intake and ex valves.

  6. #6
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    Thanks Francis. No, it's not pining. This cam requires lots of advance for it to rin properly. It idles st initial timing of 17.5 to 20.5 which makes total advance too high.

  7. #7
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    I forgot to mention that I have had it around 50* and it wasn't pining.

  8. #8
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    Achievements Checkered FlagWide Open ThrottleBurning TiresStepping on the GasBuckling Up

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    Right now, I'm running it without any vacuum advance, for a trial period.


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