Abstract: An engine includes a crankcase; an oil sump; at least one balancing shaft mounted in a balancing tunnel of the crankcase, which includes first and second end portions and a central portion extending between the end portions; and a blow-by gas recirculation system having an inlet channel communicating with the oil sump, an outlet channel communicating with an intake manifold, a centrifugal separator arranged between said inlet and outlet channels, and a drainage channel opening into the oil sump for discharging separated liquid. The inlet channel communicates with said first end portion, and said centrifugal separator is housed in said second end portion and is driven in rotation by said balancing shaft. The outlet channel communicates with a gas outlet of said centrifugal separator, whereby, during operation, blow-by gas flows successively through the central portion and the centrifugal separator in a path from the inlet to the outlet channel.

Abstract: An engine includes a crankcase; an oil sump; at least one balancing shaft mounted in a balancing tunnel of the crankcase, which includes first and second end portions and a central portion extending between the end portions; and a blow-by gas recirculation system having an inlet channel communicating with the oil sump, an outlet channel communicating with an intake manifold, a centrifugal separator arranged between said inlet and outlet channels, and a drainage channel opening into the oil sump for discharging separated liquid. The inlet channel communicates with said first end portion, and said centrifugal separator is housed in said second end portion and is driven in rotation by said balancing shaft. The outlet channel communicates with a gas outlet of said centrifugal separator, whereby, during operation, blow-by gas flows successively through the central portion and the centrifugal separator in a path from the inlet to the outlet channel.

Abstract: A cylinder head for an internal combustion engine has a body integrating, in a single cast piece, an exhaust manifold and including a lower cooling jacket and an upper cooling jacket, The lower cooling jacket is longitudinally divided into a plurality of separate transverse chambers associated to various engine cylinders, while the upper cooling jacket has a portion extending longitudinally over the entire development of the head and communicating with separate transverse chambers located on the intake side of the head. The exhaust conduits integrated in the head form separate subgroups of exhaust conduits merging into manifold portions superimposed and spaced apart from each other. The lower cooling jacket has a portion thereof which extends in the area of the body of the head which separates the superimposed portions of the abovementioned subgroups of exhaust conduits.

Abstract: A cylinder block for an internal-combustion engine includes a first cavity and a second cavity adapted to contain a cooling liquid extend around respective portions of the cylinder. The first cavity of each cylinder communicates hydraulically with the first cavity of at least one adjacent cylinder to define a first cooling jacket. The second cavity of each cylinder communicates hydraulically with the second cavity of at least one adjacent cylinder to define a second cooling jacket. The first and the second cooling jackets each are in fluid communication with a second supply channel. Each of the supply channels is in fluid communication with a supply source with a direction of flow such that the cooling liquid goes towards the first and second cooling jackets, coming out through the top face.

Abstract: A cylinder head for an internal combustion engine has a body integrating, in a single cast piece, or exhaust manifold and including a lower cooling jacket and an upper cooling jacket. The lower cooling jacket is longitudinally divided into a plurality of separate transverse chambers associated to various engine cylinders, while the upper cooling jacket has a portion extending longitudinally over the entire development of the head and communicating with separate transverse chambers located on the intake side of the head. The exhaust conduits integrated in the head form separate subgroups of exhaust conduits merging into manifold portions superimposed and spaced apart from each other. The lower cooling jacket has a portion thereof which extends in the area of the body of the head which separates the superimposed portions of the abovementioned subgroups of exhaust conduits.

Abstract: A cylinder head for an internal combustion engine incorporates—in a single cast piece—the engine exhaust manifold. A lower cooling jacket and an upper cooling jacket arranged below and above said integrated exhaust manifold are provided in the body of the head. At least one of such cooling jackets is divided into separate transverse chambers by partitions extending transverse with respect to the longitudinal direction of the head, so that the cooling fluid is forced to traverse such transverse chambers parallel according to the direction orthogonal to the longitudinal direction of the head.