Patent ID: 8051648

Claim:
An exhaust manifold being integrally formed with a cylinder head, comprising: single exhaust outlet joining passages of at least two cylinders and exhausting exhaust gas that is exhausted from the at least two cylinders that are not adjacent to each other, wherein open periods during which exhaust valves of the at least two cylinders are open are not overlapped with each other wherein the passages include: a first exhaust passage connected to a first cylinder, the first exhaust passage through which exhaust gas exhausted from the first cylinder passes; a fourth exhaust passage connected to a fourth cylinder that is not adjacent to the first cylinder, the fourth exhaust passage through which exhaust gas exhausted from the fourth cylinder passes, wherein the first exhaust passage and the fourth exhaust passage are joined together to form a single exhaust outlet, and open periods of exhaust valves of the first cylinder and the fourth cylinder are not overlapped with each other; a second exhaust passage connected to a second cylinder, the second exhaust passage through which exhaust gas exhausted from the second cylinder passes; and a third exhaust passage connected to a third cylinder, the third exhaust passage through which exhaust gas exhausted from the third cylinder passes, wherein open periods of exhaust valves of the second cylinder and the third cylinder are not overlapped with each other; wherein the first cylinder, the second cylinder, the third cylinder, and the fourth cylinder are sequentially disposed; wherein the second exhaust passage has a second exhaust outlet and the third exhaust passage has a third exhaust outlet; wherein the single exhaust outlet and the second and third exhaust outlets form an exhaust assemblage portion; wherein a water jacket is formed in the exhaust manifold, and is disposed to be adjacent to the first, second, third, and fourth exhaust passages; and wherein the water jacket extends to a spare space formed between the first exhaust passage and the fourth exhaust passage and the water jacket is adjacent to the second and third exhaust passages, the spare space displaced before the single exhaust outlet.