Turbine housing

An internal combustion engine comprising:

• a first cylinder bank;
• a primary exhaust manifold for conveying exhaust gas produced in the first cylinder bank;
• and
• a primary turbine housing, the primary turbine housing comprising:
• an exhaust port flange configured for mechanically coupling the primary turbine housing to the primary exhaust manifold, the primary exhaust manifold being configured to provide exhaust gas produced in the first cylinder bank as a primary source of working fluid;
• a turbine discharge flange configured for mechanically coupling the primary turbine housing to an exhaust system;
• a crossover flange configured for mechanically coupling the primary turbine housing to a crossover duct;
• and
• a bearing support ring configured for mechanically supporting a bearing, on which a turbine output is supported for rotation about its longitudinal axis;
• a second cylinder bank;
• a second exhaust manifold for conveying exhaust gas produced in the second cylinder bank;
• a secondary turbine housing mechanically coupled to the second exhaust manifold;
• a first isolation valve disposed in the primary turbine housing to selectively regulate the amount of flow routed therethrough;
• and
• a second isolation valve disposed in the secondary turbine housing to selectively regulate the amount of flow routed therethrough;
• wherein the crossover duct provides fluid communication between the primary turbine housing and a secondary source of working fluid from the second exhaust manifold;
• wherein the primary turbine housing defines an inlet plenum, a turbine shroud, and a discharge vent;
• wherein the exhaust port flange defines a primary inlet port that is configured to provide fluid communication between the inlet plenum and the primary source of working fluid;
• wherein the primary inlet port is configured to convey a primary stream of the primary source of working fluid to the inlet plenum;
• and
• wherein the turbine shroud defines a fluid expansion flow path for expansion of the primary stream of working fluid between a turbine inlet and a turbine exit.