Methods and systems are provided for a 2-port integrated exhaust manifold for an inline-3, inline-6, V-6, and/or V-12 engine. In one example, a system may include an exhaust manifold integrated within a cylinder head of an engine block. The integrated exhaust manifold may include a first set of two runners from a first outer cylinder coupled to a first manifold exhaust port, a second set of two runners of a second outer cylinder coupled to a second manifold exhaust port, and one runner of an inner cylinder coupled to the first manifold exhaust port and another runner of the inner cylinder coupled to the second manifold exhaust port.

An engine is provided with a cylinder head having a bridge region surrounded by an exhaust face, an exhaust passage intersecting the exhaust face, and an exhaust gas recirculation (EGR) passage fluidly coupled to the exhaust passage and intersecting the exhaust face. The head defines an upper cooling jacket having a cavity or fluid passage extending from the jacket towards a head deck face and to a closed end wall within the bridge region. The cylinder head is cooled by directing coolant from a lower jacket to an upper jacket via a drill passage adjacent to an exhaust face of the head, diverting the coolant exiting the drill passage into the fluid passage or cavity along a rib. Coolant is then directed from the fluid passage into an EGR cooling passage formed by the upper jacket adjacent to the exhaust face and about the EGR passage.

An engine having a water jacket may include a cylinder block where cylinder liners in which pistons are disposed are arranged in a length direction, a first water jacket being provided to surround the cylinder liners, and a second water jacket provided in the length direction at an exhaust side, separately from the first water jacket, and a cylinder head disposed above the cylinder block, and including a head water jacket provided therein along a length direction thereof, wherein an exhaust side of the head water jacket receives coolant from the second water jacket through connection paths.

An engine having a water jacket may include a cylinder block where cylinder liners in which pistons are disposed are arranged in a length direction, a first water jacket being provided to surround the cylinder liners, and a second water jacket provided in the length direction at an exhaust side, separately from the first water jacket, and a cylinder head disposed above the cylinder block, and including a head water jacket provided therein along a length direction thereof, wherein an exhaust side of the head water jacket receives coolant from the second water jacket through connection paths.

A cylinder head assembly for an internal combustion engine is provided. In one example implementation, the cylinder head assembly includes a cylinder head, a bypass passage formed within the cylinder head and defining a catalyst cavity, and a bypass catalytic converter disposed within the catalyst cavity, where the bypass catalytic converter is configured to provide emissions reduction during cold start, long idle, and/or low main catalytic converter temperature conditions.

A cylinder head assembly for an internal combustion engine is provided. In one example implementation, the cylinder head assembly includes a cylinder head, a bypass passage formed within the cylinder head and defining a catalyst cavity, and a bypass catalytic converter disposed within the catalyst cavity, where the bypass catalytic converter is configured to provide emissions reduction during cold start, long idle, and/or low main catalytic converter temperature conditions.

A cylinder head assembly for an internal combustion engine includes a cast cylinder head defining a combustion chamber and fabricated from a first material, and an internal support structure at least partially encapsulated within the cast cylinder head. The internal support structure is fabricated from a thermal strain and fatigue resistant second material, different from the first material, such that during engine operation, thermal and mechanical loads are transferred to the internal support structure to reduce combustion chamber displacement. The internal support structure and the cylinder head are bonded via a hot isostatic pressing (HIP) process to eliminate internal porosity and gaps therebetween.

The cylinder head 3 includes: a lower deck; a wall portion including an upper deck and a lower deck; an upper deck that is provided above the lower deck so as to face the lower deck and that defines a cooling water flow space between the lower deck and the upper deck; and a wall portion that is formed between the lower deck and the upper deck and includes a valve-hole forming wall 40 forming an intake valve hole and an exhaust valve hole which are opened into a lower surface of the lower deck. The lower deck includes: a cooling water introduction hole that passes through the lower deck in a vertical direction so as to extend in a circumferential direction of a virtual circle VC surrounding a valve-hole forming wall in a plan view; and a rib that projects from an upper surface of the lower deck.

A cylinder head of a multi-cylinder engine is provided, the cylinder head including a plurality of ceiling parts for respective cylinders, and a water jacket. Each ceiling part is connected to an intake port including a primary port and a secondary port aligned in a cylinder-row direction, and is attached with an in-cylinder pressure sensor. A plug is attached to a hollow part of the cylinder head corresponding to a core print provided to a core of the water jacket, and is disposed at a position corresponding to a location between certain cylinders. The in-cylinder pressure sensor is attached at a position on an opposite side from the plug with respect to a cylinder center axis in the cylinder-row direction. Positions of the primary and secondary ports connected to each ceiling part are interchanged in the cylinder-row direction according to the position of the in-cylinder pressure sensor.

A cylinder head of a multi-cylinder engine is provided, the cylinder head including a plurality of ceiling parts for respective cylinders, and a water jacket. Each ceiling part is connected to an intake port including a primary port and a secondary port aligned in a cylinder-row direction, and is attached with an in-cylinder pressure sensor. A plug is attached to a hollow part of the cylinder head corresponding to a core print provided to a core of the water jacket, and is disposed at a position corresponding to a location between certain cylinders. The in-cylinder pressure sensor is attached at a position on an opposite side from the plug with respect to a cylinder center axis in the cylinder-row direction. Positions of the primary and secondary ports connected to each ceiling part are interchanged in the cylinder-row direction according to the position of the in-cylinder pressure sensor.