Idle issue merc 454, new build with carb
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Idle issue merc 454, new build with carb

  1. #1
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    Default Idle issue merc 454, new build with carb

    Ok, here goes. I have my 466 that I rebuilt installed and it runs great, turns a 23 5100 rpm at 5000 feet altitude. I am running an isky cam on a 114 lobe center installed about 5 advanced, compression is 9.8 timing total is 32. I am having trouble finding a happy idle in neutral that will stay idling after shifting to foreward or reverse. It is in an 89 formula (for sale buy the way) with a bravo one. Carb is a holley 750 vacume. Any Ideas, it is a pain at the ramp or docking since the throttle and shifter are separate handles.

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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by jungledave View Post
    Ok, here goes. I have my 466 that I rebuilt installed and it runs great, turns a 23 5100 rpm at 5000 feet altitude. I am running an isky cam on a 114 lobe center installed about 5 advanced, compression is 9.8 timing total is 32. I am having trouble finding a happy idle in neutral that will stay idling after shifting to foreward or reverse. It is in an 89 formula (for sale buy the way) with a bravo one. Carb is a holley 750 vacume. Any Ideas, it is a pain at the ramp or docking since the throttle and shifter are separate handles.
    Put a couple of degree more timing and fatten up the idle screws ( more fuel at idle)

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    Ok I figured on the idle screws but didn't want to up the timing, but I will listen and try. thanks

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    What should my max idle be in neutral going into gear with a bone stock bravo 1???

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    Quote Originally Posted by jungledave View Post
    What should my max idle be in neutral going into gear with a bone stock bravo 1???
    I believe 800 RPM

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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    I believe 800 RPM
    1000
    , you might have to install smaller air bleeds on the idle circuit.
    Last edited by jimclauss; 05-10-2014 at 07:36 PM.

  9. #7
    New here Beer:30's Avatar
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    Quote Originally Posted by jungledave View Post
    What should my max idle be in neutral going into gear with a bone stock bravo 1???
    The lowest possible.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by Beer:30 View Post
    The lowest possible.
    X2

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    It's what we do BDMarine's Avatar
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    850 max
    http://www.performanceboats.com//signaturepics/sigpic837_1.gif
    B & D Marine Performance
    El Monte, Ca.

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