Blower surge
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Blower surge

  1. #1

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    Default Blower surge

    How do you get blower surge with carburetors. I've tried what people told me, richen up the fuel mixture and set the idle screw lower and it doesn't sound very good.

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Why?????????????????????????????????

    Besides, a properly set up blower system won't "surge".
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    Because I like it.

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    TJS
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    It is a rich lean rich lean rich lean condition. I have EFI and at first I had blower surge and then hooked up a wide band and got the idle to 12.7:1 and it idles 1000 RPMs rock solid without the surge.
    T.J.

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    Senior Member TwinTurbo540's Avatar
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    Hell, half the reason to have a blown set up is for the cool factor of a big surge..... How hard are you spinning the blower? Has a lot to do with cam profile as well.

    Travis

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    I don't know the percentage of overdrive, but I have a 53 tooth on top and 50 on the bottom. For the cam, its a comp cams, gross valve lift is 737 intake, exhaust .741, duration @ .050 intake 270, exhaust 276, and lobe separation of 114.
    Thanks

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    Not overdrive its underdrive.

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    Senior Member earlbrown's Avatar
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    You're underdriven with a bigger pulley on top.

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    ... Some Kind Of Monster's Avatar
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    Rock your foot on the gas pedal like someone I know

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    Senior Member Camoman's Avatar
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    Quote Originally Posted by Some Kind Of Monster View Post
    Rock your foot on the gas pedal like someone I know
    LOL that video cracks me up
    There's doing it easy,or there's doing it better

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    Senior Member Boat 405's Avatar
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    Quote Originally Posted by SmokinLowriderSS View Post
    Why?????????????????????????????????

    Besides, a properly set up blower system won't "surge".
    X2. blower surge is lame.
    Boat 405.

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    Senior Member Factory1's Avatar
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    Quote Originally Posted by widowmaker View Post
    X2. blower surge is lame.
    Well thats where opinions come in, some people dig it. A good friend of mine ran a blown injected alcohol hydro, he liked the surging, and said it was a tuning thing, you could tune it in our out. But that was an injected alcohol motor, don't know how do'able it is with carbs. Good luck!

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    Senior Member matt1840's Avatar
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    Quote Originally Posted by Camoman View Post
    LOL that video cracks me up
    is this video on youtube??? im curious lol

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    Gone
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    Quote Originally Posted by Factory1 View Post
    Well thats where opinions come in, some people dig it. A good friend of mine ran a blown injected alcohol hydro, he liked the surging, and said it was a tuning thing, you could tune it in our out. But that was an injected alcohol motor, don't know how do'able it is with carbs. Good luck!
    Injected you can tune it out but it is very tricky. You can set the barrel just so and idle speed just so.....and the surge is gone. But a slight change in load or RPM and it is back. Temp of the motor is another huge factor. Timing and advance weights is another.
    Generally when you get it smooth and no surge you risk a "flat spot" as you crack the butterflys a little too quick.
    Most boat guys set the barrel rich....to hell with surge. They don't want the flat spot and possible bang the blower. Drag car a different story. Drag cars have to stage into the lights carefully and accurately.

    On Carbs.....you want surge....richen the idle mixture. But there is no reason for it.....just if you want it. Also instead of mag locked out...put advance weights in it. Those weights playing with the timing will make it surge too.

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