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The idea is to put a one-way check valve on the PCV line to the airbox.
As the piston moves up and down, it creates alternating positive and negative pressure in the crankcase. When the piston comes down, positive pressure helps push fuel and water vapor out of the crankcase. When it goes back up, negative pressure sucks some of that vapor back in.
This may explain the condensation we see in the OCS. On the low pressure cycle, the vapors cool off, condensing before it reaches the airbox and dripping into the catch tube.
A PCV check valve would only allow vapor to escape, hopefully preventing the low pressure and condensation. I need to find time to get to the auto parts store and look for a check valve that fits the line to the airbox.
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