Abstract: A turbocharger turbine housing can include a base that defines a turbine wheel opening that includes an axis that defines an axial direction; an exhaust inlet flange that defines an exhaust inlet; an exhaust outlet flange that defines an exhaust outlet; a wastegate shaft bore, a wastegate passage, a wastegate opening for the wastegate passage and a wastegate seat disposed about the wastegate opening; bosses where each of the bosses defines a coolant opening; a spiral coolant passage in fluid communication with at least two of the coolant openings where the spiral coolant passage includes at least two windings with respect to an axial dimension of the turbocharger turbine housing; and at least one coolant passage that is in fluid communication with at least two of the at least two windings of the spiral coolant passage.

Abstract: A turbocharger turbine housing can include a base that defines a turbine wheel opening that includes an axis that defines an axial direction; an exhaust inlet flange that defines an exhaust inlet; an exhaust outlet flange that defines an exhaust outlet; a wastegate shaft bore, a wastegate passage, a wastegate opening for the wastegate passage and a wastegate seat disposed about the wastegate opening; bosses where each of the bosses defines a coolant opening; a spiral coolant passage in fluid communication with at least two of the coolant openings where the spiral coolant passage includes at least two windings with respect to an axial dimension of the turbocharger turbine housing; and at least one coolant passage that is in fluid communication with at least two of the at least two windings of the spiral coolant passage.

Abstract: An aluminum alloy turbine housing includes an inlet for exhaust, a turbine wheel space configured to receive exhaust via the inlet, a wastegate opening configured to receive exhaust via the inlet and to provide received exhaust to a wastegate chamber, and a locally hardened valve seat surrounding the wastegate opening. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

Abstract: A turbocharger assembly includes a center housing rotating assembly, which comprises a center housing, bearings housed in the center housing, a shaft rotatably supported in the bearings, and compressor and turbine wheels affixed to opposite ends of the shaft; an engine cylinder head and a housing member formed together as a one-piece integral structure, wherein the housing member defines a compressor volute that receives compressed air from the compressor wheel, a turbine volute for receiving exhaust gas from the engine, a turbine nozzle for directing exhaust gas from the turbine volute into the turbine wheel, and a turbine contour; a compressor contour plug that defines an axial inlet for the compressor and a compressor contour; and a wastegate unit operable for allowing exhaust gas to bypass the turbine wheel when the wastegate unit is open and preventing exhaust gas from bypassing the turbine wheel when the wastegate unit is closed.

Abstract: A turbocharger assembly includes a center housing rotating assembly, which comprises a center housing, bearings housed in the center housing, a shaft rotatably supported in the bearings, and compressor and turbine wheels affixed to opposite ends of the shaft; an engine cylinder head and a housing member formed together as a one-piece integral structure, wherein the housing member defines a compressor volute that receives compressed air from the compressor wheel, a turbine volute for receiving exhaust gas from the engine, a turbine nozzle for directing exhaust gas from the turbine volute into the turbine wheel, and a turbine contour; a compressor contour plug that defines an axial inlet for the compressor and a compressor contour; and a wastegate unit operable for allowing exhaust gas to bypass the turbine wheel when the wastegate unit is open and preventing exhaust gas from bypassing the turbine wheel when the wastegate unit is closed.

Abstract: A turbocharger includes a turbine wheel mounted within a turbine housing and connected to a compressor wheel by a shaft. The turbine housing defines an exhaust gas inlet connected to a divided volute that surrounds the turbine wheel, and an axial bore through which exhaust gas that has passed through the turbine wheel is discharged from the turbine housing. The turbine housing further defines a pair of concentric annular bypass passages surrounding the bore and arranged to allow exhaust gas to bypass the turbine wheel as two separate bypass streams. An annular bypass valve is disposed in the bypass passage. The bypass valve comprises a fixed annular valve seat and a rotary annular valve member arranged coaxially with the valve seat. The valve member is disposed against the valve seat and is rotatable about the axis for selectively varying a degree of alignment between respective orifices in the valve seat and valve member.

Abstract: An aluminum alloy turbine housing includes an inlet for exhaust, a turbine wheel space configured to receive exhaust via the inlet, a wastegate opening configured to receive exhaust via the inlet and to provide received exhaust to a wastegate chamber, and a locally hardened valve seat surrounding the wastegate opening. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

Abstract: A turbocharger includes a turbine wheel mounted within a turbine housing and connected to a compressor wheel by a shaft. The turbine housing defines an exhaust gas inlet connected to a divided volute that surrounds the turbine wheel, and an axial bore through which exhaust gas that has passed through the turbine wheel is discharged from the turbine housing. The turbine housing further defines a pair of concentric annular bypass passages surrounding the bore and arranged to allow exhaust gas to bypass the turbine wheel as two separate bypass streams. An annular bypass valve is disposed in the bypass passage. The bypass valve comprises a fixed annular valve seat and a rotary annular valve member arranged coaxially with the valve seat. The valve member is disposed against the valve seat and is rotatable about the axis for selectively varying a degree of alignment between respective orifices in the valve seat and valve member.