Breather Tube

Some articles on breather, breather tube:

Crankcase Ventilation System - Components and Details
... The PCV system just diverts a small percentage of this air via the breather to the crankcase before allowing it to be drawn back in to the intake tract again ... intake manifold draws air towards it, pulling air from the breather through the crankcase (where it dilutes and mixes with combustion gases), through the PCV valve, and into the intake manifold ... The PCV system usually consists of the breather tube and the PCV valve ...

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