Vintage Mustang Forums - View Single Post - Autolite 2100 carburetor vacuum issue ('68 302)
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post #12 of (permalink) Old 06-17-2019, 03:58 PM
Grimbrand
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Join Date: Jan 2019
Location: Sedgwick, Kansas
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Wilson, that valve's on backwards. If your manifold can 'suck', unrestricted, then too much air will go shooting down your manifold without properly mixed fuel. That's a massive vacuum leak! Also, the compressed air is huge overkill. This thing should 'close' at maybe 10 lbs of pressure? You can easily do it with your breath, if you don't mind motor oil on your face. =)


The idea here is to stop the intake from sucking air at idle when vacuum is high (and there's not much blowby) - but at high speeds, when there is low manifold vacuum, the blowby can travel freely through the PCV into the manifold.

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Last edited by Grimbrand; 06-17-2019 at 04:02 PM.
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