Cliff's Quadrajet Parts and Rebuild Kits
Quadrajet Problem Solving => Diagnose a Quadrajet carburetor problem => Topic started by: 59bluesilver on September 21, 2016, 05:50:52 PM
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Something doesn't quite make sense to me. The air mixture screws in this quadrajet shown below are both 1 3/4 turns from the seated position. However, the right one extends much further into the venturi than the left one. Is that the way it supposed to be?
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could be two things. You may have mismatched idle mixture screws. I've seen different tapers thu the years. And/or, the idle discharge hole may not be the same size on both sides. I've seen it on virgin carbs. Have you measured both sides idle discharge holes ?
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The screws are the same length as is the springs.
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I don't think it matters. When you are making your adjustments, turn each one in, one at a time until the engine starts to run rough and Revs drop, then back it out 1/2 to full turn. You can use a vacuum gauge to assist, make adjustments that will give you the most vacuum possible.
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I guess I don't understand what the taper does or its function. There must be some reason why it extends into the Venturi, or not. Can someone explain it to me?
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That additional air bypass hole may have something to do with it?
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I guess, it's the only thing that makes sense.