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1957 - 1960 F100 & Larger F-Series Trucks Discuss the Box Style Ford Trucks

Y block pcv question

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Old Apr 11, 2020 | 01:35 PM
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That type of cap is meant for a closed system. A hose would run from that nipple to the air cleaner, not the carb, for crankcase intake air.
 
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Old Apr 11, 2020 | 03:28 PM
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I currently have the PCV going from my drivers valve cover to the carb. Would it be the same coming from the oil filler neck?

 
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Old Apr 11, 2020 | 03:36 PM
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I have 2 hose claps in the PCV hose to limit the amount of vacuum. i tested without hose clamps and there is a ton of vacuum. Seemed to be a massive vacuum leak to carb. I have the slightest amount now just enough to clear the crank case of fumes. With my isky cam i only get around 12" of vacuum at idle with all ports blocked.
 
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Old Apr 11, 2020 | 03:37 PM
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It really doesn't matter how you do it as long as there is a filtered intake source for crankcase air.
 
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Old Apr 11, 2020 | 03:39 PM
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If you need to restrict pcv valve flow, then you have chosen the wrong valve. However, I don't know of a very good way to pick a valve.

What made you decide to do that?
 
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Old Apr 11, 2020 | 04:12 PM
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It was leaning out my carb big time. I saw it on a y-block forum somewhere. Even though my valve cover is baffled i think without the restriction it was puling in some oil to carb.
 
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Old Apr 11, 2020 | 05:55 PM
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Originally Posted by Ianmattf100
I currently have the PCV going from my drivers valve cover to the carb. Would it be the same coming from the oil filler neck?
Don't think you have your carb hooked to a PCV valve but just a breather oil cap.
 
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Old Apr 11, 2020 | 06:26 PM
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No Matthew I ordered that breather on the cover and it attaches to a pcv valve thats in the cover.
 
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Old Apr 11, 2020 | 09:46 PM
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The below method can also be used to find the correct rate of flow valve -


 
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