Crankcase breather question

AJ/FormS said

The hole you see at the bottom is not the orifice, but rather the back-fire valve to prevent a cc explosion.
The actual orifice is at the other end. The valve is a tapered pintle affair, so depending on where it is at any one time, the tapered section controls the flow between minimum and maximum.


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thank you! That makes so much more sense, so when you use your mouth to try and apply a suction through one your not moving the orfice but rather the backfire valve. I was having a hard time understanding how it would flow with less vacuum when i was assuming the backfire valve was what is controlling the flow