An exemplary intake manifold may include an upper manifold configured to receive fresh air, an EGR tube configured to introduce exhaust gas into the upper manifold to be mixed with the fresh air, and a lower manifold configured to distribute the mixture of the fresh air and the exhaust gas cylinders of the internal combustion engine. The upper manifold may include an upper shell and a lower shell that may cooperate to define at least one channel in which at least a portion of the EGR tube may be secured.

An air intake apparatus includes: an air intake apparatus body including first, second, third and fourth air intake passages respectively provided corresponding to first, second, third and fourth cylinders of a multi-cylinder engine which has one or a plurality of groups of four consecutive cylinders of the first, second, third and fourth cylinders, the multi-cylinder engine having an air intake sequence of the first cylinder, the third cylinder, the fourth cylinder, and the second cylinder; and a distribution passage through which external gas is distributed to the first, second, third and fourth air intake passages. The distribution passage includes an upstream distribution passage, first and second midstream distribution passages branched off from the upstream distribution passage, and first and second downstream distribution passages branched off from the first midstream distribution passage, and third and fourth downstream distribution passages branched off from the second midstream distribution passage.

A bolt-on replacement intake manifold has an asymmetrical plenum with a first end including an inlet, a closed terminal end, a concave top surface and a convex bottom surface; a flange; and a plurality of runners extending from the bottom surface of the plenum and terminating at the flange. The plenum defines an interior space in flow communication with the runners. The bottom surface of the plenum is wider than the top surface. The plenum initially widens from the inlet to the first runner and then begins to narrow from the first runner toward the last runner adjacent to the closed terminal end. The runners are tapered, curved, and vary in length. The intake manifold causes air to exit each of the plurality of runners at substantially the same angle. The manifold balances airflow across each runner and increases swirl inside the cylinders enhancing fuel economy, power output, and torque.

The invention relates to a distribution module (11) for distributing an inlet mixture to at least two cylinders of a heat engine, this inlet mixture selectively comprising:cooled inlet air, ornon-cooled inlet air, orrecirculation gas, ora combination of at least two of the above elements, the module (11) comprising:a first inlet (21) for conveying cooled inlet air into the module (11),a second inlet (22) for conveying non-cooled inlet air into the module (11),a third inlet (23) for conveying recirculation gas into the module (11), the module being arranged to distribute the inlet mixture substantially equally between said at least two cylinders.

An intake manifold is provided that controls swirl on entry to a combustion chamber. Each intake manifold includes a fin or rib portion positioned to reduce or eliminate swirl induced by the configuration of the intake manifold, particularly when used in a large engine having a left bank and a right bank of combustion chambers. By controlling swirl induced by the intake manifold, swirl consistency is improved between engine cylinders and between the left bank and the right bank, improving the consistency of power output and reducing emissions, particularly particulate emissions, also called smoke.

An intake system piping structure of an internal combustion engine includes an intake manifold connected to an end-side first cylinder and an end-side second cylinder which are provided farthest from each other in a cylinder bank in which a plurality of cylinders is placed in line, and an intercooler connected to the intake manifold. The intercooler is arranged in such a manner that a widthwise center of the intercooler on the side of an intake inlet and a widthwise center of the intercooler on the side of the manifold are offset to the side of the end-side second cylinder from a cylinder bank direction center line in center between an axial center line of the end-side first cylinder and an axial center line of the end-side second cylinder. Furthermore, the intercooler is also arranged in such a manner that an offset amount of the widthwise center of the intercooler on the side of the intake inlet from the cylinder bank direction center line is greater than an offset amount of the widthwise center of the intercooler on the side of the manifold from the cylinder bank direction center line.

Methods and systems are provided for introducing a charge motion to a cylinder via a bladder in an intake manifold runner. In one example, a system may include positioning a bladder in an intake port proximate to a cylinder.

Methods and systems are provided for introducing a charge motion to a cylinder via a bladder in an intake manifold runner. In one example, a system may include positioning a bladder in an intake port proximate to a cylinder.

An intake apparatus for an internal combustion engine includes an intake apparatus body including a plurality of intake pipes which are connected to respective cylinders of the internal combustion engine, the internal combustion engine including the cylinders of which the number is multiples of three, and an outside gas distribution portion distributing outside gas to each of the plurality of intake pipes, the outside gas distribution portion including a single first outside gas distribution pipe connected to an outside gas supply source, a plurality of second outside gas distribution pipes branched from the first outside gas distribution portion, an outside gas collective passage gathering outside gas from the plurality of second outside gas distribution pipes, and three third outside gas distribution pipes branched from the outside gas collective passage and connected to the plurality of intake pipes respectively.

An engine includes a cylinder block defining a bank of cylinders having physically adjacent first and second cylinders. The engine also has a gas compressor configured to pressurize an ambient airflow for delivery to the first cylinder and the second cylinder. The engine additionally has intake valves configured to control delivery of the pressurized airflow as a first airstream to the first cylinder and a second airstream to the second cylinder for combustion therein. A firing interval for the two adjacent cylinders results in the first airstream temporally overlapping the second airstream. A charge-air cooler is configured to cool the pressurized airflow prior to delivery thereof to the first and second cylinders and includes a cold-side plenum for discharging the pressurized airflow toward the first and second cylinders. A partition in the cold-side plenum is configured to separate the first airstream from the second airstream and thereby minimize interference therebetween.