EGR and intake air mixing manifold with pancake plenum

An air intake arrangement for an engine system, the air intake arrangement comprising:

• an intake pipe configured to deliver a flow of intake air;
• an exhaust gas recirculation (EGR) pipe configured to deliver a flow of EGR air;
• and a mixing manifold for mixing intake air and exhaust gas recirculation (EGR) air in an engine system, the mixing manifold comprising:
• a manifold chamber into which the intake air from the intake pipe and the EGR air from the EGR pipe are received, the manifold chamber being an open, no mix-type chamber devoid of turbulence-inducing passages or devices promoting mixing of the EGR air with the intake air;
• a throat section having an upper end at the manifold chamber and extending to a lower end about a longitudinal axis of the mixing manifold, the lower end having a cross-section that is less than a cross-section of the upper end;
• and a plenum having a pancake body with an upper wall at the lower end of the throat section and a lower wall spaced from the upper wall by side walls defining an interior volume leading from the throat section to a front outlet opening, wherein the upper wall is spaced from the lower wall by a longitudinal dimension along the longitudinal axis that is less than a lateral dimension of the pancake body between the side walls, and wherein the front outlet opening is positioned a distance lateral from the longitudinal axis and the lower wall has a rounded protrusion that extends toward the upper wall and along length of the lower wall.