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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

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, charge motion consistency is improved between engine cylinders and between the left bank and the right bank, thereby improving the consistency of combustion and power output, improving efficiency and reducing emissions (e.g., decreased particulate emissions (also described as smoke), hydrocarbon emissions, and NOx emissions), and further including an improved knock margin, improved fuel economy, wider rich and lean limits, etc.

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1. An internal combustion engine, comprising: an intake manifold; a plurality of jumper tubes coupled to the intake manifold and at least one cylinder head, the plurality of jumper tubes each having a passageway, and a central axis; wherein at least one of the plurality of jumper tubes further inclu

1. An internal combustion engine, comprising: an intake manifold; a plurality of jumper tubes coupled to the intake manifold and at least one cylinder head, the plurality of jumper tubes each having a passageway, and a central axis; wherein at least one of the plurality of jumper tubes further includes a fin portion and a rib portion, wherein the fin portion traverses a distance between two points along the interior surface of the jumper tube to define a first transverse airflow passage and a second transverse airflow passage, wherein the fin is positioned at or near an interface where the jumper tube and the intake manifold are coupled, and wherein the rib portion comprises a plurality of ribs extending radially inward from the interior surface of the jumper tube toward the central axis. 2. The internal combustion engine of claim 1, wherein at least one of the plurality of jumper tubes each further comprise a first portion and a second portion coupled to each other to define the passageway, wherein the first portion is coupled to the intake manifold and the second portion is coupled to the at least one cylinder head. 3. The internal combustion engine of claim 2, wherein the first portion and the second portion are coupled to each other by an O-ring to provide a seal between the first portion and the second portion. 4. The internal combustion engine of claim 2, wherein the fin portion is positioned in the first portion of the jumper tube. 5. The internal combustion engine of claim 1, wherein the fin portion is integrally formed with the jumper tube. 6. The internal combustion engine of claim 1, wherein the plurality of ribs are positioned in the first portion of the jumper tube. 7. The internal combustion engine of claim 1, wherein the fin portion is positioned in the first portion and the plurality of ribs is positioned in the second portion of the jumper tube, wherein the first portion of the jumper tube and the second portion of the jumper tube are coupled to each other. 8. An internal combustion engine, comprising: an intake manifold; a plurality of jumper tubes coupled to the intake manifold and at least one cylinder head, the plurality of jumper tubes each having a passageway, and a central axis; the plurality of jumper tubes including a first portion coupled to the intake manifold, a third portion coupled to the at least one cylinder head, and a second portion removably coupled to the first portion and the second portion such that the second portion of the jumper tube can be removed without removing the intake manifold or the least one cylinder head; wherein at least one of the plurality of jumper tubes further includes a fin portion and a rib portion, the fin portion and the rib portion positioned within the first portion, the fin portion and the rib portion extending inwardly from the interior surface of the jumper tube within the passageway; wherein the fin portion traverses a distance between two points along the interior surface of the jumper tube to define a first transverse airflow passage and a second transverse airflow passage. 9. The internal combustion engine of claim 8, wherein the at least one cylinder head includes a first cylinder head and a second cylinder head configured to form a V-configuration, and the intake manifold is positioned within the V-configuration. 10. The internal combustion engine of claim 8, wherein the rib portion includes a plurality of ribs extending radially inward from the interior surface of the jumper tube toward the central axis. 11. An internal combustion engine, comprising: an intake manifold; a plurality of jumper tubes coupled to the intake manifold and at least one cylinder head, the plurality of jumper tubes each having a passageway, and a central axis; wherein at least one of the plurality of jumper tubes further includes a fin portion and a rib portion, wherein the fin portion traverses a distance between two points along the interior surface of the jumper tube to define a first transverse airflow passage and a second transverse airflow passage, wherein the fin portion is configured to assist in straightening the flow of intake charge, and wherein the rib portion comprises a plurality of ribs extending radially inward from the interior surface of the jumper tube toward the central axis. 12. The internal combustion engine of claim 11, wherein at least one of the plurality of jumper tubes each further comprise a first portion and a second portion coupled to each other to define the passageway, wherein the first portion is coupled to the intake manifold and the second portion is coupled to the at least one cylinder head. 13. The internal combustion engine of claim 12, wherein the first portion and the second portion are coupled to each other by an O-ring to provide a seal between the first portion and the second portion. 14. The internal combustion engine of claim 12, wherein the fin portion is positioned in the first portion of the jumper tube. 15. The internal combustion engine of claim 11, wherein the fin portion is integrally formed with the jumper tube. 16. The internal combustion engine of claim 11, wherein the plurality of ribs are positioned in the first portion of the jumper tube. 17. The internal combustion engine of claim 12, wherein the fin portion is positioned in the first portion and the plurality of ribs is positioned in the second portion of the jumper tube, wherein the first portion of the jumper tube and the second portion of the jumper tube are coupled to each other.