Dual Dominators
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Dual Dominators

  1. #1
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    Default Dual Dominators

    Need some help I 'am running dual dominators on a dart tunnel ram manifold and the carbs are mounted side ways. The motor has a surge and a miss on top end will putting in a wedge spacer between carbs and manifold help.

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    "Need For Speed" Gearhead's Avatar
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    There may be a little more to it than just spacers. If your pump is set at a standard installation location of 4 to 5 degrees and your engine is set at the same then the carbs will be leaning backwards. Leveling or angling the carbs forward will definately help fuel control.

    Have you checked float levels and fuel delivery? Has the engine and carbs been tuned or are they out of the box? Brand and model of the carbs?

    It does sound like you are experiencing a lean condition which can be caused by the above angle of the carbs, fuel level, fuel delivery or carbs just jetted too lean. Generally the load on a jetboat seems to respond well to larger jetting.

    You may considering using the wedged spacers and if the condition persist add some jetting and check your results.

    Hope this helps,
    Gear

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    LP-25.com Infomaniac's Avatar
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    Sounds like it is running out of fuel to me. For whatever reason. Many reasons listed above.
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    Never seen wedge spacers on a sideways mounted carbs before. Maybe i'm not looking hard enough.
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    mo balls than $cents$ IMPATIENT 1's Avatar
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    gota ask, are these perhaps 3 circuit dominators?

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  8. #6
    "Need For Speed" Gearhead's Avatar
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    Quote Originally Posted by Michigan Daaaaaa View Post
    Never seen wedge spacers on a sideways mounted carbs before. Maybe i'm not looking hard enough.
    We run them on several boats

  9. #7
    Boat Nut sleekcrafter's Avatar
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    You may find the fuel issue is float related. Under accell the fuel is pushed up the sides of the carb, closing the needle/seat. This allows the a Jet or PV to be exposed to air, resulting in a surge or lean-out condition. They make wedge shaped floats to allos the needle/seat to function normaly under accell.

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    Quote Originally Posted by sleekcrafter View Post
    You may find the fuel issue is float related. Under accell the fuel is pushed up the sides of the carb, closing the needle/seat. This allows the a Jet or PV to be exposed to air, resulting in a surge or lean-out condition. They make wedge shaped floats to allos the needle/seat to function normaly under accell.

    Another good point mentioned above. Braswell carburetion was one of the first ones to work with this a number of years ago.

    On extremely hard accelerating boats and cars.... we use both carb spacer wedges. Wedges to get the carbs back close to level versus a bad rearward slope that is worsened by bow rise or wheels up leave, along with wedged floats to help control the fuel level in the bowls as the fuel is sloshed rearward in a high G formce leave. Both good products. In single four or forward applications a rear float modified to accomodate jet extensions is used in addition to the possible needed wedges.

    There are several good products on the market to assist with these problems.

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    I do all my own stunts. white tortilla's Avatar
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    .
    Last edited by white tortilla; 10-30-2010 at 11:44 AM. Reason: stolen computer

  12. #10
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    Is the fuel sys before the Carbs ok?

    Which pump and what size lines and tank fittings?

  13. #11
    Senior Member Boost's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    You may find the fuel issue is float related. Under accell the fuel is pushed up the sides of the carb, closing the needle/seat. This allows the a Jet or PV to be exposed to air, resulting in a surge or lean-out condition. They make wedge shaped floats to allos the needle/seat to function normaly under accell.

    Here's how I cut my floats
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