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#1
03-04-2018, 08:53 PM
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Right, when on heavy throttle PCV stops working and the negative pressure in the air cleaner will then draw from the breather side so there is always a vacuum in the crankcase.
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'68 GTO '69 Corvette '75 Cadillac Coupe Deville TOM |
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#2
03-05-2018, 04:46 AM
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There is NO vacuum in aircleaner or crankcase since they are vented to atmosphere at all times without restrictions. With engine running vacuum is present in intake only (unless throttles are wide open on heavy load).
What you see is atmospheric pressure rushing into the void under the partially closed throttle plates. This atmospheric pressure pushes fuel through the carburetor circuits and crankcase fumes from the CC vent tube for combustion. HTH |
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