I believe Honda intent is to push air into the valve cover in order to force the oily air out the factory pcv box/valve due to the side in which the factory slash cut is done. The system relies upon the engine vacuum at idle pulling on the pcv valve and then at higher rpms full throttle (no vacuum) to use the velocity of the incoming air on the slash cut tube in the intake pipe to force the breathing. So basically at idle using manifold vacuum and at wide open when there is little manifold vauum using intake velocity.
Honda wasn't really designing around 12:1 compression na motors going to 9k+ or cars running 30 lbs of boost. In those cases the crankcase builds up too much pressure that this system no longer works and that is why on those apps a crankcase breather system either veting to atmosphere or being mechanically ventilated by other means.
plus one
the valvecover is connected to the intake hose to pull the air Out of the valvecover to releve pressure faster at higher Rpms i try to always keep mine connected thats why when you put your finger over the hole thats on your intake tub its like a Vac.
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175+served in engines built from minime to gsr/lsvtec,b16 b20vtec,d15 k24 powerhouses or just rebuilds.life is good
i like when people don't take my advice.cause then i make more money when u need it rebuild the right way!
how many speed holes do i need in my bumper,b4 i can run 15's?