oil breather pipe

oil breather pipe
A crankcase breather pipe used prior to engine emission control systems to remove fumes and pressure from the engine crankcase. Also called road-draft tube. The tube, which was connected to the crankcase and suspended slightly above the ground, depended on venturi action to create a partial vacuum as the vehicle moved. The method was ineffective below about 20 mph

Dictionary of automotive terms. 2015.

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