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 Post subject: Carb mixture and vacuum
PostPosted: Fri Sep 23, 2016 3:56 pm 
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TBI Slant 6

Joined: Mon Jun 15, 2015 1:58 pm
Posts: 137
Location: So Cal
Car Model*:
Well on my carter bbd, 225ci, I hooked up a vacuum gauge directly to a port that sticks up off the intake manifold. It is giving me a solid 23 in. I am trying to set idle mixture, watching gauge but the only time I see and hear something happen is if I turn the screws bascially all the way in, if I start backing them off I never see or hear a change, so much so that the screws are about to fall out. All the info I read says that when you back them out , at some point the engine starts to bog down again.???

Maybe I have too much vacuum??

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66 dodge dart 270, 225ci, 3.7l, L6


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PostPosted: Fri Sep 23, 2016 3:59 pm 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7126
Location: SW Washington
Car Model*:
Many emissions carburetors have a very small idle mixture change with the adjustment needles. If you tried what you have with an aftermarket Holley non-emission carb you could easily flow enough fuel to bog the engine as the needle adjustment makes a large difference and the idle circuit will flow plenty of fuel.

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Joshua Skinner, formerly SrA US Air Force


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