vaccum secodaries
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vaccum secodaries

  1. #1
    Cheers for beers! DELTA~HOLIC's Avatar
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    Default vaccum secodaries

    I have a Holley Carb and the vaccum secondaries aren't opening. I had one of my buddies check them as i was WOT and they didnt open. Once he stuck his hand down there and opened them manually I gained an additional 500 RPM's. I took apart the diaphram and everything looked legit. He was saying I possibly need a lighter spring, but I would like your guys input. Thanks!




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    About 500' AGL MudPumper's Avatar
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    Mechanical Secondaries and call it a day....JMO

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    yup...Holley sells a complete spring kit...it includes colored springs in different strengths ...you might be able to find it at Checkers, Auto Zone, Napa etc or else Summit, Jegs carry it...just sayin'

    FastRat

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    Resident Ford Nut Sleeper CP's Avatar
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    Start with the mid-strength spring. Other than that a DP. I hate vac sec carbs on jet boats.

    S CP

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    There is a hole in the primary side of the main body down in the venturi. The air passing by this opens the secondaries. Make sure the hole is not plugged up. I have blown down the venturi with an compressed air and made them open.

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    Purple headed member Quickjet's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    Start with the mid-strength spring. Other than that a DP. I hate vac sec carbs on jet boats.

    S CP
    Are you crazy!!!??? Vacum sec carbs work great on Jet boats. I used one for my Bahner. Everytime I unhooked it from the truck I would throw an old 3310 under the trailer tire to keep the thing from rolling out of my garage.
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    Screamin SeaMonkees Schi-502's Avatar
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    Senior Member moneysucker's Avatar
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    Stick a small bolt through where the arm connects to the primaries so when you floor it the arm will open them manually.
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    Senior Member G-Body's Avatar
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    I have a 650 vacuum on my 305. I put the lightest spring in and it would not open all the way. I was swapping springs out and noticed the little ball bearing that slows the secondary opening so you dont get a bog.....you know the one that holley says never to take out. Well in my application taking it out worked out very well. Secondaries open every time now and I don`t even have a bog.
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    Senior Member jet460's Avatar
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    Quote Originally Posted by Burnt Sticks View Post
    There is a hole in the primary side of the main body down in the venturi. The air passing by this opens the secondaries. Make sure the hole is not plugged up. I have blown down the venturi with an compressed air and made them open.
    Mine did the same thing.
    Plus, I switched to the lightest spring in the kit when I rebuilt my 4160's.

  12. #11
    Cheers for beers! DELTA~HOLIC's Avatar
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    Quote Originally Posted by Schi-502 View Post
    Lend me your boat. I'll fix it!

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    Anytime Mark. I went out last Sat, how bout you?



  13. #12
    Cheers for beers! DELTA~HOLIC's Avatar
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    Thanks guys! I will fool around with it a little more to see if I can get them to open, if not I will just go mechanical. Seems thats the way to go!



  14. #13
    Super Moderator HammerDown's Avatar
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    Heck, you would have to pry my Holley VS carb from my dead cold hands before I would give it up.
    Offers good cruising economy and it still hits hard when the go-pedal is punched down.
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    Senior Member splatter's Avatar
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    I had a stock 460 in a cruiser with a 850 dp on it. Performance wasn't an issue with an old heavy tub with a stock motor so I put a 750 vc on it for kicks. It didn't lose any top rpm and it cut fuel consumption by a bunch.

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