Jetboat timing/advance setups and Vacuum info
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Jetboat timing/advance setups and Vacuum info

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    Senior Member Chop Shop's Avatar
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    Default Jetboat timing/advance setups and Vacuum info

    I have been a 4 tires kinda guy for along time, but boats are educating me quickly.

    I have seen several threads where it has been mentioned to "lock out" the vacuum advance on your distributor.

    I will only apply this to SBC and BBC engines as thats the only ones I will work on.


    Why lock out the vacuum advance? Mine is hooked up just like I would in a car. Will I notice a difference of its locked out? Also what about weights and springs inside the dist? Do you want them light to advance quickly or strong to advance more slowly?


    What about the affect jet boat pumps/engines have on manifold vacuum? It seems we have been having a hard time getting power valves and vacuum secondaries dialed in also. Im going to assume its related to the engines vacuum parameters being different than a car?


    Please help. Running at 80-90% is not cutting anymore.

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    gn7
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