An improved air-cooled aviation engine includes a compact combustion chamber having an intake valve opening, an exhaust valve opening, and a generally elliptical shape. The elliptical shape has a major axis and a minor axis, with the major axis intersecting both the intake valve opening and the exhaust valve opening. In some examples, the major axis is the same length or shorter than a diameter of a cylinder bore of the engine, and the minor axis is smaller than the major axis. Combustion is thus constrained to a smaller area than that of the cylinder bore.

A cylinder head assembly for an internal combustion engine includes a cast cylinder head and a turbocharger housing integrally cast with the cylinder head and having an integrally cast wastegate housing. The turbocharger housing is configured to receive a turbocharger cartridge rotatably supporting a shaft coupled between a compressor wheel and a turbine wheel. The integrally cast wastegate housing defines a wastegate chamber configured to receive a wastegate valve, a flow of exhaust gas from the turbine wheel, and a flow of wastegate exhaust gas.

A cylinder head that can efficiently cool air that flows in intake ports of respective cylinders without causing a difference among the cylinders. A cooling water channel is provided in peripheries of the intake ports in the cylinder head. The cooling water channel includes a plurality of water jackets that independently cover parts of respective wall surfaces of a plurality of intake ports. Further, the cooling water channel includes a main channel for cooling water supply that extends in a longitudinal direction of the cylinder head, on an upper part of a row of the intake ports, and the main channel and the respective water jackets are each connected via branch channels for cooling water supply.

A cylinder head that can efficiently cool air that flows in intake ports of respective cylinders without causing a difference among the cylinders. A cooling water channel is provided in peripheries of the intake ports in the cylinder head. The cooling water channel includes a plurality of water jackets that independently cover parts of respective wall surfaces of a plurality of intake ports. Further, the cooling water channel includes a main channel for cooling water supply that extends in a longitudinal direction of the cylinder head, on an upper part of a row of the intake ports, and the main channel and the respective water jackets are each connected via branch channels for cooling water supply.

A cylinder head assembly includes a cylinder head casting, and an injector sleeve within an injector bore in the cylinder head casting. The injector sleeve includes a first sleeve end, and an injector clamping surface formed by an inner sleeve surface adjacent to a cylindrical second sleeve end. The injector sleeve further includes a sleeve clamping surface in contact with an upward facing middle deck surface of the cylinder head casting, and a reaction wall extending between the injector clamping surface and the sleeve clamping surface to transfer an injector clamping load to the upward facing middle deck surface.

A cylinder head assembly includes a cylinder head casting, and an injector sleeve within an injector bore in the cylinder head casting. The injector sleeve includes a first sleeve end, and an injector clamping surface formed by an inner sleeve surface adjacent to a cylindrical second sleeve end. The injector sleeve further includes a sleeve clamping surface in contact with an upward facing middle deck surface of the cylinder head casting, and a reaction wall extending between the injector clamping surface and the sleeve clamping surface to transfer an injector clamping load to the upward facing middle deck surface.

There is provided a water cooled engine including a cylinder head with minimized thermal strain. A head water jacket includes an inter-exhaust-port-wall water channel between a first exhaust entrance port wall and a second exhaust entrance port wall. A cylinder head includes a cooling water injection passage provided at a bottom wall of the cylinder head. The cooling water injection passage is positioned on the exhaust end side, and includes a passage entrance provided on the exhaust end side, and a passage exit directed toward the inter-exhaust-port-wall water channel. An exhaust port wall includes a heat dissipation fin extending from a first exhaust entrance port wall toward an exhaust end. The space between the heat dissipation fin and a second exhaust entrance port wall forms a water channel entrance of the inter-exhaust-port-wall water channel.

There is provided a water cooled engine including a cylinder head with minimized thermal strain. A head water jacket includes an inter-exhaust-port-wall water channel between a first exhaust entrance port wall and a second exhaust entrance port wall. A cylinder head includes a cooling water injection passage provided at a bottom wall of the cylinder head. The cooling water injection passage is positioned on the exhaust end side, and includes a passage entrance provided on the exhaust end side, and a passage exit directed toward the inter-exhaust-port-wall water channel. An exhaust port wall includes a heat dissipation fin extending from a first exhaust entrance port wall toward an exhaust end. The space between the heat dissipation fin and a second exhaust entrance port wall forms a water channel entrance of the inter-exhaust-port-wall water channel.

A cylinder head assembly includes a cast cylinder head and a turbocharger housing integrally cast with the cylinder head. The integrated cylinder head and turbocharger housing includes: (i) a compact low wetted area to provide an uninterrupted flow path pointed directly at a catalyst face to facilitate achieving cold start emissions targets, (ii) a casting core assembly with specific core geometry and steps for assembly to enable core assembly while meeting all cylinder head and integrated turbine housing functional requirements, (iii) an oxygen sensor disposed pre-turbine in an integrated exhaust manifold, and (iv) a fully integrated PCV make-up air system.

A cylinder head for an internal combustion engine with at least one cylinder has a cooling duct system which has a coolant inlet side and a coolant outlet side, a combustion chamber section, two coolant-inlet-side gas ducts, two coolant-outlet-side gas ducts and two adjacent component openings, such as a spark plug opening and an injection nozzle opening. The cylinder head has an annular wall section provided between the component openings, on the one hand, and the gas ducts, on the other hand. The cooling duct system has a web cooling duct which runs into the annular wall section, extends between the coolant-inlet-side gas ducts and has an upper wall. The upper wall has a guiding surface which is directed obliquely downwards in the region of the annular wall section in order to deflect coolant in the direction of the combustion chamber section.