1938 LaSalle Production - GM Heritage Center

portant Cadillac feature is not found in the crankcase
ventilation of any other car. .
At high speeds vapors are discharged through a pipe
located in the rear of the air cleaner where the velocity
of inrushing air to the carburetor provides suction.
Crankcase Ventilating System
At low speeds vapors are discharged through a pipe
in the intake manifold which has a high amount of
suction due to the strong vacuum at low engine speeds.
This vacuum also serves to minimize any danger of oil
leak in the crankcase.
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