Abstract: The present invention relates to a drive system for outboard motors. The drive system comprises a combustion engine having a crankshaft adapted to rotate about a substantially vertical axis. The combustion engine further comprises a camshaft extending parallel to the vertical crankshaft. A high pressure fuel pump is provided for supplying high pressure fuels to the combustion cylinders. The high pressure fuel pump is directly driven by the camshaft.

Abstract: Methods and systems are provided for varying the volume of an engine intake system to increase the volumetric efficiency of the engine. In one example, a resonance system may be coupled to the engine intake system and a position of a movable element in the resonance system may be varied to vary the volume of the chamber in accordance with engine speed. The intake system provides improved volumetric efficiency for the engine.

Abstract: The air intake system includes a first piece, an intermediate piece constituting a surge tank and joined to the first piece, and a second piece including an air intake passage upstream portion in communication with the surge tank, the second piece being joined to the intermediate piece. The first piece and the intermediate piece constitute an air intake passage downstream portion in communication with the air intake passage upstream portion. The second piece further includes a flange portion that connects the air intake passage downstream portion and an air intake port of an internal combustion engine.

Abstract: An engine assembly generally includes an engine and an intake manifold. The engine includes a plurality of cylinders. The plurality of cylinders includes a pair of cylinders. The engine is configured to sequentially fire the pair of cylinders. The intake manifold defines a plurality of ports. Each port is in fluid communication with one of the plurality of cylinders. The plurality of ports includes a pair of ports. Each of the pair of ports is disposed in fluid communication with one of the pair of cylinders. The intake manifold further includes a baffle disposed between the pair of ports to restrict fluid flow within the intake manifold between the pair of ports.

Abstract: An intake manifold is provided with a chamber member provided with an exhaust port and a chamber formed therein, a port member provided with an intake groove forming a ventilation passage bent so as to be communicated with the exhaust port and the chamber of the chamber member when the chamber member and the port member are welded together, and a cover member that covers the port member from a side opposite to the welded side between the chamber member and the port member. The intake groove has an outer wall surface opposing to the chamber member is formed with a reinforcing member so as to protrude from at least one of the port member side or chamber member side toward another one thereof, and the reinforcing member extends along an extending direction of the intake groove, the reinforcing member is welded to another reinforcing member protruding from another outer wall surface of the port member and chamber member, or from the port member and the chamber member.

Abstract: Various systems for reducing noise, vibration, and harshness in an intake manifold are provided. In one example, an intake manifold includes one or more runners, a plenum fluidically coupled to the one or more runners, an inlet having a wall thickness, and a first and a second indentation, where the first indentation protrudes radially inward at a first inflection point in a first direction, the second indentation protrudes radially inward at a second inflection point in a second direction substantially anti-parallel to the first direction, and the wall thickness is maintained at the first and second inflection points. In this way, noise, vibration, and harshness associated with the intake manifold and its inlet may be reduced without additional weight, cost, or complexity.

Abstract: An air intake device includes a cooler and a surge tank accommodating the cooler. The air intake device is to be connected to a cylinder head of an engine. The cylinder head includes an intake port that accommodates an intake valve. The cooler has a refrigerant passage through which refrigerant flows and an air passage through which intake air flows. The surge tank has a connector connected to the cylinder head. The cooler has a protrusion protruding from the connector toward the intake valve.

Abstract: The intake system includes an integrated airflow cooler module comprising a lower manifold assembly and a throttle body fluidly connected to, and disposed within the lower manifold assembly to meter combustion air into a lower manifold volume of the lower manifold assembly. An upper manifold assembly is configured for assembly to the lower manifold assembly to define a manifold volume therebetween and a heat exchanger is disposed in the manifold volume, between the upper manifold assembly and the lower manifold assembly and between a combustion air inlet in the integrated airflow cooler module and the throttle body.

Abstract: An intake manifold assembly for mounting to a cylinder head and configured to deliver combustion air thereto comprises a centrally positioned zip tube having an opening for receipt of combustion air from a throttle body. First and second flow runners extend from the centrally positioned zip tube to terminate at a common intake manifold plenum for delivery of combustion air thereto. A centrally located access opening is defined between the first and second flow runners.

Abstract: A mounting device can mount an intake manifold to an engine and includes a bending moment applying device applying a bending moment to the intake manifold as the intake manifold is mounted to the engine.

Abstract: An intake system of an engine is provided. The intake system including an intake manifold, a vacuum port located in said intake manifold and in an air-flow path downstream of a throttle body and upstream of a plurality of intake runners, the vacuum port including a molded flow disruptor including a cross-beam traversing an outlet of the vacuum port, the cross-beam oriented at an angle between 0 and 90 degrees with respect to an axis of a throat in the intake manifold, and a vacuum passage coupling the vacuum port to a vehicle subsystem.

Abstract: An air-intake duct, which is disposed between an air outlet of an air cleaner box constituting an air cleaner and an air inlet of a throttle body constituting a throttle device, is configured to guide air cleaned by the air cleaner to the throttle device. The air-intake duct includes a tubular coupling member including an upstream coupling portion coupled in an air tight manner to the air outlet of the air cleaner box and a downstream coupling portion air-tightly coupled to the air inlet of the throttle body, the coupling member being entirely formed of an elastic rubber material. The air-intake duct also includes an air guide member including a first air inlet configured to take in air therethrough from inside the air cleaner box, a first air outlet configured to discharge the air therethrough toward the throttle body, and a fitting portion fitted to the coupling member.

Abstract: An intake manifold M for an internal combustion engine has two or more structural members P1 to P3 including a first structural member P1 integrally provided with an inlet flange 22 to which a throttle device 4 is connected, and an outlet flange 40 to be joined to a cylinder head 2 provided with intake ports 5. The first structural member P1 is provided integrally with an inlet part 21 forming at least part of an inlet passage 11 and including the inlet flange 22. The outlet flange 40 is formed integrally with the inlet part 21 so as to extend across a direction in which the inlet passage 11 extends, two bolts 451 and 452 for fastening the outlet flange 40 to the cylinder head are disposed respectively on the opposite sides of the inlet passage 11. The rigidity of the inlet flange and fastening of the outlet flange to the cylinder head by fastening means improves a vibration reducing effect on a throttle device joined to the inlet flange.

Abstract: A connection between an expansion chamber outlet and a rubber cuff that accommodates an inlet portion of a throttle body exhibits an overmolded, hot plate or spin weld type of connection between an expansion chamber wall outlet portion and the rubber cuff. The rubber cuff may have a bellow in it to absorb shock and force from the throttle body. The rubber cuff may be insert molded around the expansion chamber outlet such that the joined interface between the rubber cuff and the expansion chamber is from the molding. The molded interface prevents separation due to air forces through the chamber and cuff. A cuff recession on a cuff inside diameter receives a protuberance of the throttle body inlet portion. A band clamp fits around the outside diameter of the cuff, adjacent the throttle body inlet protuberance, to prevent movement relative to the throttle body.

Abstract: An intake system for a V-type multiple cylinder internal combustion engine includes a plurality of parallel first intake pipes 15L connected to the plurality of cylinders of a first cylinder row, a plurality of parallel second intake pipes 15R connected to the plurality of cylinders of a second cylinder row. The first intake pipes 15L and the second intake pipes 15R extend into an air distribution case 10 so as to extend across each other. A first inlet pipe 13R is provided at a part of a first side wall 11R of the air distribution case 10 corresponding to a substantially middle point of the row of the first intake pipes 15L, and a second inlet pipe 13L is provided at a part of a second side wall 11L of the air distribution case 10 corresponding to a substantially middle point of the row of the second intake pipes 15R. Air flows through the first inlet pipe 13R into the first intake pipes 15L and air flows through the second inlet pipe 13L into the second intake pipes 15R.

Abstract: A method of modifying an air intake manifold to control air intake runners. The method includes the steps of providing a cartridge including a plurality of compartments, each spaced apart to define a groove therebetween, snap-fitting a bushing carrier having a rotatable bushing into each of the grooves, positioning a flap having a slot over each of the compartments, inserting a shaft through each slot and each bushing thereby rotatably retaining each of the flaps within one of the plurality of compartments, positioning the cartridge over the air intake manifold so that each of the plurality of compartments is substantially axially aligned with one of the air intake runners, and removably connecting the cartridge with the air intake manifold.

Abstract: A resin molded body constituting a resin intake apparatus includes a surge tank and a plurality of branch passages each branching off from the surge tank. A communication passage is formed in a wall forming the surge tank to communicate a bottom of the surge tank with one of the branch passages. The resin molded body is formed by two split molded parts integrally welded to each other at welded portions so that the communication passage is formed between the welded portions.

Abstract: An intake manifold for an engine includes a plurality of intake distribution pipes arranged in a side-by-side relation to one another; an intake inlet pipe provided in an end wall and arranged in a direction of the intake distribution pipes; a surge chamber provided inside the intake manifold, and providing communication between the intake inlet pipe and the intake distribution pipes; and an intake guide wall provided integrally with the intake manifold. The intake guide wall extending in the direction in which the intake distribution pipes are arranged. One surface of the intake guide wall is smooth-and-flat and the other side surface of the intake guide wall includes a plurality of thinned concave parts separated by a plurality of ribs provided between the concave parts.

Abstract: An intake manifold for a multicylinder internal combustion engine includes a number of inlet runners operatively connected with a mounting flange. A sealing region circumscribes only an outer periphery of the mounting flange and does not extend between adjacent ones of the intake runners. The sealing region includes a continuous groove formed in the mounting flange and a sealing composition applied to the groove.

Abstract: An internal combustion engine comprises a cylinder block, a cylinder head mounted on the cylinder block, and an intake manifold assembly. The intake manifold assembly comprises an inboard disposed inboard disposed zip tube, an outboard disposed intake manifold plenum fluidly connected to and configured to receive combustion air from the zip tube and a plurality of intake runners fluidly connected to and configured to transport combustion air from the intake manifold plenum to the cylinder head.

Abstract: A throttle control valve is provided. It includes a valve housing having an inlet end, an outlet end. A valve body located within the housing has a sealing end and a spindle. The sealing end has a teardrop shaped cross-section for cooperating with the valve housing.

Abstract: An integrated positive crankcase ventilation (PCV) channel is formed along a structural weld line between two shell components that are welded together to form an air intake manifold. The integrated PCV channel can be used to uniformly distribute blow-by gases from the crankcase of an internal combustion engine to a plurality of combustion chambers via the air intake manifold.

Abstract: A mixture distribution device (1) for a combustion engine comprises a first mixture inlet (3), multiple first mixture outlets (4) and a first branch guiding structure (6). The mixture distribution device further comprises a second mixture distribution device (21) comprising a second mixture inlet (23), as well as multiple second mixture outlets (24) and a second branch guiding structure (26). An air/fuel mixture supplied to the first mixture inlet (3) is divided into a first fraction (7) and a second fraction (27) which is not collected and is collected, respectively, by the second mixture distribution device.

Abstract: An intake manifold for an internal combustion engine including a manifold base portion and a manifold cover portion. The manifold cover portion and base portion are each formed from a thermoplastic composite material. The base portion includes several runners which may be coupled to respective intake ports of an internal combustion head. The manifold base portion and the manifold cover portion may be selected from a group of differing parts to provide a manifold having desired application or performance characteristics.

Abstract: An intake system of an internal combustion engine includes a surge tank communicating with cylinders of the engine via individual intake paths, a vacuum tank connected to the surge tank, a valve that permits or inhibits communication between the surge tank and the vacuum tank, and a control unit that controls opening and closing of the valve. The control unit executes the steps of: (a) opening the valve to communicate the surge tank with the vacuum tank when the surge tank is held in a negative-pressure condition during operation of the engine, and closing the valve upon a lapse of a predetermined period of time so as to hold the vacuum tank in a negative-pressure condition, (b) opening the valve for a predetermined period of time when a condition for starting the engine is satisfied, so as to reduce the pressure in the surge tank, and (c) closing the valve when the engine is started.

Abstract: An internal combustion engine intake device is configured to suppress the occurrence of freezing in a portion thereof where blow-by gas or another gas is introduced into an intake passage. The intake device basically has a throttle chamber, an intake air collector, an air induction pipe, a partitioning part, a gas introducing pipe and a volume chamber. The air induction pipe is provided between the throttle valve and the intake air collector. The partitioning part divides the space inside the air induction pipe into first and second air induction spaces. The gas introducing pipe introduces the blow-by gas into the first and second air induction spaces directly. The blow-by gas contains moisture and has a higher temperature than the fresh air in the first and second air induction spaces. The volume chamber is arranged between the gas introducing pipe and the first and second air induction spaces.

Abstract: In an intake manifold in which air introduced from an introduction port is fed to each cylinder of an engine by use of multiple ducts which are disposed parallel, a communication space section which provides communication between the introduction port which introduces air and inlets of the ducts is provided, this communication space section is formed so as to extend in a direction in which the inlets of the ducts are arrayed, a funnel section which causes the inlets of the ducts to be arrayed on a same surface is formed in this communication space section, and this funnel section is formed from a single member only in the main body section by providing mating surfaces of the main body section and the duct component member off the funnel section.

Abstract: An intake system for a combustion engine includes an intake passage (12), a suction duct (22) protruding into the intake passage (12) to communicate therewith and having front and rear wall areas (22a and 22b), and a fuel injector (21) positioned upstream of the intake duct (22) for injecting fuel (F) into the suction duct (22). The rear wall area (22b) has a height greater than that of the front wall area (22a).

Abstract: An air inlet module incorporating, in one structural unit, on the one hand, a supply manifold, on the other hand, an exhaust gas reinjection circuit and, finally, a gas/liquid heat exchanger designed to cool the exhaust gases, the module consisting of a sealed assembly of at most four parts, namely, a first part comprising the inlet manifold, the outlet manifolds, a portion of the supply conduit, and a hollow body forming the tank of the exchanger, a second part comprising the many circulation manifolds and a support body for assembling said manifolds in the tank, and a third part of which one portion forms a cover for the hollow open container and comprising several conduit portions forming at least partially the exhaust gas circulation circuit and conveying these gases to the inlet manifold, also incorporated in said third part.

Abstract: An intake manifold is assembled from a near manifold component which is positioned near an engine, a far manifold component which is positioned far from the engine and a middle manifold component which is positioned between the near and far manifold components. The near manifold component includes first path-forming parts forming the lower parts of the intake paths. The middle manifold component includes second path-forming parts which are joined on and vibration-welded to the first path-forming parts. The middle manifold component further includes third path-forming parts which extend in the vertical direction in a curve. Further, the far manifold component includes fourth path-forming parts which are vibration-welded to the third path-forming parts.

Abstract: An intake manifold (1) of a multi-cylinder internal combustion engine comprises a single pipe portion (4), a collector (5) connected to the pipe portion (4), and a plurality of branch pipes (6) branching from the collector (5) to each cylinder. The pipe portion (4) and the collector (5) divided into a plurality of spaces (1a, 1b) by a partitioning member (12). Blow-by gas is equally distributed to each cylinder using a simple structure comprising a discharge vent (3) for blow-by gas in the pipe portion (4) extending over the partitioning member (12) and being equal to the two spaces (1a, 1b). It is preferred that a notch (8) is formed facing the discharge vent (3) on the partitioning member (12).

Abstract: An air intake duct for a vehicle having a cuttable groove at an external wall of an air exhaust port can be applied to any vehicle regardless of whether an air filter is adopted, thus providing cost-effectiveness, preventing air leakage when the air filter is not used, and increasing the air-conditioner/heater function of the vehicle.

Abstract: The present invention relates to a fresh gas supply system for an internal combustion engine, in particular of a motor vehicle. A fresh gas distributor can be connected on the inlet side with a fresh gas feed line, and on the outlet side to an internal combustion engine by means of several connection pipes. The connection pipes are allocated in each case to a combustion chamber of the internal combustion engine. An improvement in the fresh gas supply system can be achieved in that a bypass resonator or Helmholtz resonator is connected to the fresh gas distributor, which, at a predetermined revolution speed of the internal combustion engine, improves the fresh gas filling of the combustion chambers by resonance charging.

Abstract: The present invention relates to an intake manifold or distributor for a thermal engine constituted by at least two parts (1, 1?) assembled together, in particular two parts made from thermoplastic material assembled by vibration welding and comprising an intake or plenum chamber connected, for fluidic communication, to intake pipes opening into the chamber. Intake manifold or distributor for a thermal engine characterized in that it comprises an additional attached piece (4) comprised, on the one hand, of a main body forming a support and fitting plate and, on the other hand, of pipe portions (6, 6?) produced in one piece with said body (5) and defining at least the inlet orifices (6, 6?) of said pipes (3), said attached piece (4) being positioned and, if applicable, fixed, prior to assembly of said at least two parts (1, 1?) forming said manifold or distributor on or in one of these parts.

Abstract: An air intake system for an internal combustion engine includes a manifold defining a chamber. The chamber is divided into a first chamber portion and a second chamber portion by a permeable member for fluid communication between the first chamber portion and the second chamber portion. The permeable member facilitates mixing of air and exhaust gas for more consistent EGR distribution among a plurality of cylinders.

Abstract: An intake arrangement for an internal combustion engine, including an intake manifold including an intake collector disposed above the engine body, a plurality of branch pipes extending from the intake collector to an intake side of the engine body over above the engine body in a curved state, and a connecting wall disposed between the branch pipes. The branch pipes extend in a direction substantially perpendicular to a longitudinal direction of the intake collector and are arranged with space between adjacent ones of the branch pipes. The connecting wall covers the space between the adjacent ones of the branch pipes and coextends with the branch pipes. The connecting wall has an outside air introducing opening opposed to the intake side of the engine body.

Abstract: Because the PCV channel for guiding blow-by gas to a plenum is formed in an intake manifold, the blow-by gas can be equally supplied to respective combustion chambers. In addition, since a PCV nipple is mounted on the outermost intake runner that has a relatively high temperature, freezing of water vapor in the blow-by gas can be prevented in the PCV nipple.

Abstract: The invention relates to an air intake for an engine (19) of a motor vehicle. In particular, the present invention concerns a detachable connection between an air collector module (10) and an intake duct module (11) of the air intake. The invention also concerns a method for installing the air intake to the engine (19) of the motor vehicle. A preferred embodiment of the air intake comprises a detachable connection comprising at least one releasable connection arrangement (17) and at least one interlock arrangement (18). The at least one releasable connection arrangement (17) comprises a releasable connector (25) inserted through the air collector module (10) and arranged to secure the air collector module (10) to the intake duct module (11). The at least one interlock arrangement (18) comprises a bracket (31) mounted on one of the air collector module (10) and the intake duct module (11), and an opposing piece (32) mounted on the other of the air collector module (10) and the intake duct module (11).

Abstract: A shield cover for an engine is provided to shield electric parts, in an engine wherein an engine body includes a crankcase having a plurality of cylinder bores. An intake chamber common to all of the cylinder bores is spaced away from the crankcase. The shield cover is made in one piece, making it possible to reduce the number of parts and also of the cost, and to achieve a generally compact configuration of the engine. A plurality of electric parts 47L, 47R, 62L, 62R, 64 are disposed around an intake plenum 49, and the plural electric parts 47L, 47R, 62L, 62R, 64 are covered with a shield cover 67 attached to the engine body 12 in such a manner as to cover at least part of the intake plenum 49.

Abstract: An intake pipe (10) for an internal combustion engine composed of shells (11a, 11b) in which the geometry of the joining surfaces (19) adopts an approximately stepped course in areas with a slight incline relative to to joining force (F). This produces areas with a greater or lesser inclination relative to a joint line (16) indicating the average inclination of the joining surfaces. This results in areas which can be welded with a high degree of stability because of their considerable incline towards the joining force. These areas can then support areas which are less inclined towards the joining force. This allows the shells (11a, 11b) to have strongly curved joining surfaces, which increases the geometric design freedom of the intake pipe and, in particular, makes it possible to manufacture intake pipes with strongly curved intake channels constructed from just two shells.

Abstract: An air induction system is arranged to introduce air into a plurality of combustion chambers. The air induction system includes intake passages through which the air flows to the combustion chambers. Throttle valves are arranged to regulate an amount of the air flowing through the intake passages. Auxiliary runners communicate with the intake passages at a location positioned downstream of the throttle valves. The respective runners are unified with each other to form a common chamber. A single conduit has an end communicating with the common chamber and another end communicating with a location that generally is at atmospheric pressure. The air flowing through the conduit, the common chamber and the auxiliary runners also is supplied to the combustion chambers. The common chamber can be positioned next to the intake passages. A control valve can be provided at a location along the single conduit.

Abstract: Methods, constructions, and systems for treating engine emissions. An engine having a crankcase includes air intake, blow-by vent, and exhaust port; the crankcase emits blow-by gases through the blow-by vent and produces an exhaust stream through the exhaust port. The blow-by gases are directed through a blow-by filter to produce filtered gases. The filtered gases are directed back into the air intake of the crankcase; and the exhaust stream is treated with a catalyst arrangement. Total emissions of a turbo-charged diesel engine having an engine crankcase and an exhaust tailpipe are reducible. The total emissions includes particulate matter matter emissions from the engine crankcase added to the particulate matter emissions from the exhaust tailpipe.

Abstract: A constrained layer damping system for use in an integrated air fuel module having a control module mounted thereon is provided. A control module and a wiring harness extending from the control module are coated with an encapsulant. A first layer of formed material is placed on a first side of the wiring harness and a first side of the control module, and a second layer of formed material is placed on a second side of both the wiring harness and the control module.

Abstract: An intake device for an internal combustion engine, comprising welded shells joined along a partition line, in which the partition line is provided with a region for producing inclined additional surfaces, which generate a transverse force Q2 due to their inclination relative to a pressure force D applied for welding the shells. This transverse force Q2 offsets a transverse force Q1 which is generated as a result of the inclination of partial regions of the partition line relative to the applied pressure force D. In this way, the transverse forces which arise during production of the intake device may be at least partially offset in the component, so that little or no forces are exerted on the molding tools, and the welding results for the intake pipe may thus be improved.

Abstract: A multi-cylinder internal combustion engine includes an intake manifold having branch pipes connected to one side of a cylinder head and curved to allow the intake manifold to extend to directly above a cylinder-head cover, and intake-side spark plugs and fuel injectors which are incorporated in the cylinder head. The spark plugs are disposed outside a valve train chamber on a side of the valve train chamber where curved portions of the branch pipes are disposed, and the fuel injectors and ignition coils provided above the spark plugs are disposed between the valve train chamber and the curved portions in a direction normal to axes of the cylinders as viewed from a direction in which cylinders are arranged. The ignition coils are disposed so as not to overlap the branch pipes as viewed from a direction in which the ignition coils are attached to the cylinder head.

Abstract: An air routing system, especially an air intake system of an internal combustion engine, which makes optimal use of available installation space by integrating a bypass channel (25) into an air intake module (10). The volume of the bypass channel also provides an acoustic shield for the collector chamber or plenum (22). The free area (13) behind the mounting flange (11) that is required for screwing in mounting bolts in order to mount the air intake module (10) is used by an air intake hood (14) which can be installed on the filter housing (15) after the air intake module has been mounted. This assures that there is a greater volume available in the filter housing (15), thereby reducing the noise at the inlet opening of the air intake module.

Abstract: Branching pipes connect a surge tank to an intake manifold of an internal combustion engine. The branching pipes are made such that each gas column of the internal combustion receives a uniform intake volume. This is achieved by either making each branching pipe of the same length, or by adjusting the inside diameters of the branching pipes, thereby creating a flow delay of the intake into the gas columns, resulting in uniform intake volume. The inside diameters of the branching pipes are either made uniformly of a different diameter, or, alternatively, the inside diameters of the branching pipes include throttles for reducing the diameter of the branching pipe at a localized portion. In both cases, a flow delay of the intake into the gas columns is compensated, resulting in a uniform intake volume.

Abstract: An air intake duct for an internal combustion engine, which has a plurality of intake tubes 13. In one of the intervening spaces 15 between the intake tubes a working element, especially a filter housing 16, is contained. The latter communicates directly with the crankcase of the internal combustion engine, which is not shown in the drawings. The intake duct 10 is affixed over this connection, while the outlets 24 are joined to the internal combustion engine through resilient or elastic isolating elements. The advantage of the intake duct according to the invention lies in improved accessibility of the filter housing, since by unscrewing the cover 17 the filter insert can easily be replaced. Due to the upright position of the filter housing a positively controlled drainage is furthermore assured.

Abstract: A field replaceable unitary manifold housing for providing combustion air and combustion fuel to an internal combustion engine is disclosed. The housing includes an air purification cavity having a spaced apart air intake and air discharge. The housing also includes a filter for purifying air disposed in the air purification cavity intermediate the air intake and the air discharge. The housing also includes a hollow elongate member having a first end coupled to the filter and a second end coupled to a plenum chamber for directing the air, the plenum chamber being integral with the air purification cavity. The housing also includes a plurality of channels, each channel integral with the housing and having a first end integral with the plenum chamber and a second end coupled to a cylinder head of the engine.

Abstract: This invention relates to an exhaust recirculation system for a multi-cylinder internal combustion engine (1), wherein intake air aspirated to a collector (4) from an intake passage (6) of circular cross-section is provided to cylinders (#1-#4) via branch pipes (5A-5D) connected the collector (4). The exhaust gas recirculation system is provided with an exhaust gas recirculation pipe (7) which branches off from an exhaust passage (3) and connected to the intake passage (6), and an exhaust gas inlet (8, 9) which leads a recirculated exhaust gas of the exhaust recirculation pipe (7) into the intake passage (6) along a tangent line of the circular cross-section of the intake passage (6).