Abstract: Methods and systems are provided for modified intake runners including ribs in the direction of airflow. In one example, a system may include an intake manifold adapted to couple to an intake port via an intake runner. Internal to the intake runner, a plurality of negative ribs may be arranged along a direction of air flow on a façade of an inner portion.

Abstract: An intake system of an engine is provided. The intake system may include an intake manifold coupled to a first throttle body and a second throttle body, where the intake manifold is formed from an upper shell and a lower shell. The intake system further includes a vacuum port located in the intake manifold and in an air-flow path downstream of the first throttle body and the second throttle body and upstream of a plurality of intake runners of the intake manifold, the vacuum port including a spigot extending through the upper shell of the intake manifold, and a vacuum passage coupling the vacuum port to a vehicle subsystem.

Abstract: An engine, such as a variable displacement engine, has a camshaft retainer. The camshaft retainer has a cap adapted to cooperate with a carrier to support first and second overhead camshafts for rotation. The retainer cap forms a housing for a camshaft journal bearing. The retainer cap also forms a retainer land defining an open channel adapted to provide a jet of lubricating fluid from the bearing housing to externally lubricate a cam. The retainer land is adapted to mate with a sealing land of the carrier to enclose the open channel.

Abstract: An engine, such as a variable displacement engine, has a camshaft retainer. The camshaft retainer has a cap adapted to cooperate with a carrier to support first and second overhead camshafts for rotation. The retainer cap forms a housing for a camshaft journal bearing. The retainer cap also forms a retainer land defining an open channel adapted to provide a jet of lubricating fluid from the bearing housing to externally lubricate a cam. The retainer land is adapted to mate with a sealing land of the carrier to enclose the open channel.