Internal combustion engine cylinder head with multi-runner, multi-port integrated exhaust manifold

A motor vehicle, comprising:

• a vehicle body with an engine compartment;
• an exhaust system with an exhaust discharge pipe attached to the vehicle body;
• and
• an internal combustion engine (ICE) assembly disposed within the engine compartment, the ICE assembly comprising:
• an engine block with a cylinder bank defining a plurality of cylinder bores;
• a plurality of pistons each reciprocally movable within a respective one of the cylinder bores;
• and
• an integrated exhaust manifold (IEM) cylinder head with a single-piece unitary cylinder head body attached to the engine block on top of the cylinder bank, the cylinder head body integrally defining:
• a plurality of chamber surfaces each aligned with a respective one of the cylinder bores and pistons to cooperatively define a combustion chamber;
• a plurality of exhaust ports each fluidly coupled to a respective one of the cylinder bores and configured to evacuate exhaust gas therefrom;
• a flange region projecting from an outer surface of the cylinder head body, the flange region including a plurality of runner exit ports fluidly coupled to the exhaust discharge pipe and configured to evacuate exhaust gas from the cylinder head body, the runner exit ports being segregated and fluidly isolated from each other to each evacuate to the exhaust system exhaust gas from a single one of the cylinder bores;
• and
• a plurality of exhaust runners each extending from a respective one of the exhaust ports to a respective one of the runner exit ports, the exhaust runners being segregated and fluidly isolated from each other to each evacuate through a single one of the runner exit ports exhaust gas from a single one of the cylinder bores.

A method of constructing an integrated exhaust manifold (IEM) cylinder head for a motor vehicle with an engine and an exhaust system, the engine including an engine block with a plurality of cylinder bores and a plurality of pistons each disposed in a respective one of the cylinder bores, the method comprising:

• forming a cylinder head body configured to attach to the engine block;
• forming on the cylinder head body a plurality of chamber surfaces each configured to align with a respective one of the cylinder bores and pistons to cooperatively define a combustion chamber;
• forming on the cylinder head body a plurality of exhaust ports each configured to communicate with a respective one of the cylinder bores and evacuate exhaust gas therefrom;
• forming on the cylinder head body a plurality of runner exit ports each configured to communicate with the exhaust system to evacuate exhaust gas from the cylinder head body;
• and
• forming in the cylinder head body a plurality of exhaust runners each extending from a respective one of the exhaust ports to a respective one of the runner exit ports,
• wherein the exhaust runners are segregated and fluidly isolated from each other to each transmit exhaust gases from a single one of the cylinder bores.