Patent ID: 8839759

Claim:
A cylinder head of an engine with an integrated exhaust manifold comprising: a first inner exhaust runner including first and second conduits each having a valve guide entry point and a second inner exhaust runner including first and second conduits each having a valve guide entry point, a cross-sectional area of the first inner exhaust runner having a first area, the cross-sectional area of the first inner exhaust runner located downstream of the valve guide entry points of the first inner exhaust runner's first and second conduits and upstream of a first confluence area, a cross-sectional area of the second inner exhaust runner located downstream of the valve guide entry points of the second inner exhaust runner's first and second conduits and upstream of a second confluence area, the first and second confluence areas upstream of a third confluence area; and a first outer exhaust runner including first and second conduits each having a valve guide entry point and a second outer exhaust runner including first and second conduits each having a valve guide entry point, a cross-sectional area of the first outer exhaust runner greater than the first area, the cross-sectional area of the first outer exhaust runner located downstream of the valve guide entry points of the first outer exhaust runner's first and second conduits and upstream of a fourth confluence area, a cross-sectional area of the second outer exhaust runner located downstream of the valve guide entry points of the second outer exhaust runner's first and second conduits and upstream of the fourth confluence area, the fourth confluence area downstream of the third confluence area, and where the first, second, third, and fourth confluence areas are located within the cylinder head.