Intake manifold for internal combustion engine, positive crankcase ventilation system including same, and internal combustion engine

An intake manifold for an internal combustion engine, comprising:

• a plenum including an inlet opening;
• a plurality of runners, each of the runners extends from the plenum and includes a first end opened to the plenum and a second end configured to be connected to the internal combustion engine, each of the runners incudes an outer surface;
• and
• a ventilation chamber, the ventilation chamber protrudes from and extends along each of the runners, the ventilation chamber includes,
• a bottom surface that includes a plurality of valleys and a plurality of peaks, each of the valleys is located between a respective pair of the peaks,
• a plurality of ports, each of the ports is located on a respective one of the peaks and opens into a respective one of the runners, and
• a labyrinth extending across the ventilation chamber, the peaks and the valleys forming a portion of the labyrinth, the labyrinth configured to cause fluid entering the ventilation chamber from the inlet to move in a non-linear path within the ventilation chamber.

An intake manifold for an internal combustion engine, comprising:

• a plenum including an inlet opening;
• a plurality of runners, each of the runners extending from the plenum and including a first end opened to the plenum and a second end configured to be connected to the internal combustion engine, each of the runners including an outer surface;
• and
• a plurality of ports, each of the ports opening into a respective one of the runners;
• a perimeter wall protruding from the outer surface of the runners and surrounding the ports;
• a bottom surface encircled by the perimeter wall and including,
• a plurality of peaks, each of the peaks is formed by a portion of the outer surface of a respective one of the runners, and
• a plurality of valleys, each of the valleys is located between a respective pair of the peaks;
• a cover adjacent the perimeter wall and opposing the bottom surface, the cover including an inner surface;
• and
• a plurality of projections protruding from one of the inner surface and the bottom surface, wherein
• the peaks, the valleys, and the projections form a labyrinth that extends across a ventilation space bound by the bottom surface, the perimeter wall and the cover.