Patent ID: 8915235

Claim:
An internal combustion engine comprising: a plurality of combustion cylinders; an exhaust gas system fluidly connected to the combustion cylinders; an intake air system defining an airflow path for supplying air to the combustion cylinders, the intake air system including: an upstream intake section having an upstream elbow and a downstream elbow, the upstream elbow having a first leg and a second leg connected by an upstream bend, the second leg being downstream of the first leg, the first leg, the second leg, and the upstream bend lying in a first plane, the downstream elbow having a third leg, and a fourth leg connected by an downstream bend, the fourth leg being downstream of the third leg, the third leg, the fourth leg, and the downstream bend lying in a second plane, the first plane and the second plane intersecting at an angle of between forty-five and one hundred and thirty-five degrees; a downstream intake manifold receiving air from the upstream intake section and supplying the air to the combustion cylinders; and an exhaust gas recirculation system for recirculating exhaust gas from the exhaust gas system to the intake air system, the exhaust gas recirculation system including a mixing tube extending into and substantially parallel with the airflow path of the intake air system at a location upstream of the-second leg and being configured to introduce exhaust gas into the upstream intake section at a location upstream of the second leg and within the airflow path.