Vacuum advance dizzy
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Vacuum advance dizzy

  1. #1
    Senior Member 2savage4you's Avatar
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    Default Vacuum advance dizzy

    Who has them on there boats? and do they work well... I figured they are more for a car than a boat right??
    Looking for a dizzy and all i can find are the vacuum advance style
    2sav

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  3. #2
    Sit N' Spin Jetaholic's Avatar
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    Quote Originally Posted by 2savage4you View Post
    Who has them on there boats? and do they work well... I figured they are more for a car than a boat right??
    Looking for a dizzy and all i can find are the vacuum advance style
    2sav
    You can use a dizzy with the vac advance dashpot...just dont hook it up to anything or remove it as it serves no real purpose in a jet boat. You figure a jet boat engine is at full advance by 3,000 RPMs and most jets don't ever run below 3,000 anyway.

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    Senior Member H20MOFO's Avatar
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    I was told to lock it out, if not it will move around on you. The lock out kit from petronics was b/o so I just tacked mine in place with a wire feed welder.
    Another Hot Boat refugee

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    Highaboosta Unchained's Avatar
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    The vacuum advance is to add additional advance past the centrifugal weights under high manifold vacuum and light load cruising speeds.

    There's nothing wrong with a V/A dist but you need to know what manifold vacuum you are pulling at a cruise speed. If you have high manifold vacuum / light load you can get a benefit from the additional advance which may increase fuel economy.
    If you have low vacuum / high load the V/A dist is not going to do anything for you.
    Under low vacuum / high load it will have no effect and you will just be running off the centrifugal weights. For WOT operation you need to check timing with the V/A disconnected.

    Twin Turbo 1800 HP V-Drive lake boat

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    The small gain in fuel mileage you may get with a vac. advance will be all but unmeasurable and the problems they can create (big increase in spark scatter) can get expensive depending on your combo. If you have to run a dist. set-up for it you definatly need to lock the advance plate with either the above mentioned kit or tack weld it.
    No reason for one in a boat IMHO.

  8. #6
    Senior Member moneysucker's Avatar
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    There are quite a few mech advance Distributors available through summit or jegs. I use MSD in all my boats.

    Cy

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    Senior Member Delemorte's Avatar
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    Quote Originally Posted by moneysucker View Post
    There are quite a few mech advance Distributors available through summit or jegs. I use MSD in all my boats.

    Cy

    Yup i just bought one and am loving it.... Runs SOOO MUCH BETTER!!!
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    How are the advance plates locked out ? Do i need to do this with a HEI dizzy in my jet ? The V A is plugged also. Do i need to readjust the timing after locking out the plates ? Sorry for all the questions. The motor runs great the way it is but like everybody else, i'm looking for more in little places.
    No more Mr. Nice Guy !

  11. #9
    Senior Member gregb's Avatar
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    If your going to run an HEI and want to lock it out here's a trick mechanism that allows you to adjust the timing, it just replaces the vacuum can.

    http://www.speedwaymotors.com/GmSear...itleDescr=True

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    Thanks Greg, man thats the cats ass rite there !!! Will order me one in the morning. Thanks again.
    No more Mr. Nice Guy !

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