10-01-2021, 01:33 AM
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#22
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,126
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Re: Flame arrestor at passenger side valve cover
Quote:
Originally Posted by dmjlambert
I was looking for the post and thought I had it bookmarked but I guess I can't find it now. Somebody here made an explanation that: normally the vent side with the flame arrestor is where fresh air goes into the engine, and the PCV valve side is where the blow by and other unburned fuel/oil saturated dirty air comes out of the engine. That dirty air is then sucked into the intake and burned as fuel. There are conditions of load especially as the engine gets more wear, there is more blow by and air will actually come out of both the fresh air inlet and the PCV valve. That is when it is useful to have the flame arrester and hose to the air cleaner, so that dirty air is also sucked into the carburetor and burned. If you use a breather, which is a minimal filter, that dirty air will come out and dirty the valve cover and engine compartment and stink up the cab.
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Interesting. Helps explain why my C20 leaks so much oil. "Chrome don't get you home".
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Tony
71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s details such as OEM identifications& part numbers, written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025
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