ENGINE HAVING INTEGRATED EXHAUST MANIFOLD WITH COMBINED DUCTS FOR INSIDE CYLINDERS AND OUTSIDE CYLINDERS

摘要

An internal combustion engine has a cooling jacket at least partially integrated in the cylinder head. The engine has two groups of cylinders: inside cylinders and outside cylinders. Each cylinder has at least one exhaust port, each leading to an individual duct. Individual ducts of outside cylinders converge to form an outside combined duct. In a four-cylinder engine or cylinder head, individual ducts of inside cylinders converge to form an inside combined duct with the inside combined duct remaining separated from the outside combined duct by the cooling jacket. The inside combined duct is farther away from the mounting surface of the cylinder head to the cylinder block than the outside combined duct. The cooling jacket includes upper, middle, and lower cooling jackets and connectors between the upper and lower cooling jackets.

主权项

1. An engine having a cylinder head with at least two exhaust ports per cylinder, comprising:
a pair of individual ducts associated with each cylinder and coupled to the at least two exhaust ports; a paired duct coupled to each pair of individual ducts; an outside combined duct coupled to paired ducts of a first group of cylinders; and an inside combined duct coupled to paired ducts of a second group of cylinders, wherein the outside combined duct is separated from the inside combined duct and cylinders of the first group are each separated in firing order by firing of a cylinder in the second group.