Quote:
Originally Posted by maverickmk
The hose shouldn't collapse as there is positive pressure from the crank case to the carb/air cleaner. PCV: Positive Crankcase Ventilation
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Help me understand.
Isn't the flow of air to the air cleaner via the breather hose and from the PCV valve to the carburetor the result of the high volume of air drawn into the engine via the carb creating a vacuum as defined by Bernoulli's principle which says the higher the velocity of a gas or liquid, the lower the pressure? If so, and if the flame arrestor were to get plugged the resultant vacuum could possibly cause a collapse of an overly flexible breather hose. Granted, it would have to be a pretty weak walled hose.