Abstract: An exhaust structure for use in an outboard engine of a vertical-type four-cycle V-type having cylinder heads, a crankcase, cylinder blocks constituting left and right sides of an integral body disposed in a V shape as seen in a plan view and forming a V-bank therebetween, an intake system disposed in the V bank, exhaust systems disposed on the left and right sides outside the V-bank, and a crankshaft disposed substantially vertically to the surface formed where the crankcase and cylinder blocks join one another, wherein the engine is disposed above an engine support attached to the hull and an oil pan is disposed beneath the engine support. The exhaust systems join and become integral inside the engine support and then pass through the interior of the oil pan to discharge exhaust gases. The invention provides an outboard engine exhaust structure having a non-complex oil pan of sufficient capacity.

Abstract: An air gap insulated exhaust manifold for an internal combustion engine of a motor vehicle that has a catalytic converter. The exhaust manifold includes an inner pipe and an outer pipe with a connecting flange on the cylinder head side of the outer pipe. The outer pipe encloses the inner pipe and is spaced therefrom at a distance. A pipe end of the inner pipe protrudes in a guided manner into the cylinder head and only the outer pipe is fastenable to the cylinder head by way of the connecting flange.

Abstract: An exhaust system for an outboard motor includes an improved construction that can be compact enough for the limited space afforded within a powerhead of an outboard motor. The outboard motor includes an engine and a support member arranged to support the engine. The engine includes a cylinder block that defines a plurality of cylinder bores. The cylinder bores extend generally horizontally and spaced apart vertically from each other to form a cylinder bank extending generally vertically. At least two exhaust manifolds extend generally vertically aside and along the cylinder bank. Pistons reciprocate within the cylinder bores. A cylinder head closes ends of the cylinder bores to define combustion chambers together with the cylinder bores and the pistons. The cylinder head further defines at least one exhaust port per each one of the combustion chambers. Exhaust passages communicate with the exhaust ports.

Abstract: An exhaust manifold for a vehicle engine and a manufacturing process to prevent corrosion of the manifold during shipping and storage. The manifold includes a manifold body having a plurality of arms corresponding to the exhaust ports of the engine and a collector chamber for directing the exhaust gasses to the vehicle exhaust system. Attached to the ports of the body are flanges to facilitate connection of the manifold to the engine. The flanges are manufactured of carbon steel and includes apertures to receive mounting flanges. To prevent corrosion of the flanges, the flanges are subject to a process of ferritic nitro carburization which inhibits the formation of iron-oxide.

Abstract: Disclosed is a personal watercraft capable of appropriately detecting temperatures of an engine and an exhaust manifold by using one temperature sensor and in particular capable of finding that cooling water flow is stagnant in cooling systems of them based on the detection of the temperatures. The personal watercraft comprises a water-cooled multi-cylinder engine placed in an engine room of a body, an exhaust manifold for gathering an exhaust gas from the engine, the exhaust manifold being cooled by cooling water, and a temperature sensor provided so as to be located downstream of the vicinity of an end of the exhaust manifold that is located downstream in an exhaust gas flow path.

Abstract: A heat shield provides thermal insulation and reduced noise transmission for under-the-hood vehicular engine components, such as exhaust manifolds. The structure is formed in three layers: an outer metal layer to provide structural integrity, a center insulation layer to isolate heat and dampen noise, and an inner metal layer directly adjacent the shielded component for reflecting heat back to the shielded component. As disclosed, the insulation layer is sandwiched between the two metal layers. The heat shield is formed in two integral mating halves to define a unitary structure containing grommets. The grommets incorporate capscrews rotatably secured in respective halves of the structure for attachment to mounting bosses on the component. Finally, the edges of the two metal layers of the heat shield are folded over to prevent injury to installers, and to reinforce the heat shield structure for enhancing its useful life under severe conditions of vibration and heat.

Abstract: In an exhaust system for an internal combustion engine, having an exhaust manifold including an inner shell and an outer shell partially surrounding the inner shell, so that the space between the shells forms an insulating volume, an exhaust gas recirculation line is connected to the outer shell of the exhaust manifold for removal of exhaust gas for its recirculating from the space between the inner and outer shells. The invention is also directed to a method for recirculating exhaust gas.

Abstract: An exhaust gas system includes a collector for joining exhaust gas flows from two or more cylinders of a combustion engine. The collector has an outlet cross-section behind which a tubular jacket is disposed. A honeycomb body is disposed in the tubular jacket. A space through which a flow is to take place is defined between the outlet cross-section and the honeycomb body. At least one guide surface is disposed in the space for diverting at least a part of the exhaust gas flows. A method is provided for applying exhaust gas flows to a honeycomb body. The flows arrive at the honeycomb body at least partly from different directions. The exhaust gas flows are diverted by at least a first guide surface, before they impinge upon the honeycomb body, in such a way that they flow in a direction at least partly opposite to that of the exhaust gas flows, and their incidence upon the honeycomb body is thus delayed.

Abstract: In an exhaust manifold to be mounted on a cylinder head of an internal combustion engine which cylinder head includes a plurality of exhaust passages, the exhaust manifold includes a gas collector housing with a mounting flange, a gas conducting duct arranged in spaced relationship within the gas collector housing and having a mounting collar, and a hold-down element mounted together with the flange onto the cylinder head and including a recess receiving the collar of the gas conducting duct for retaining the gas conducting duct in engagement with the cylinder head but permitting relative movement thereto.

Abstract: A Y-pipe and flattened boom tube exhaust pipe for use on race cars, such as stock cars which race on oval tracks, which mount to the lower frame or chassis of the car, and which route exhaust gasses to the side of the car while providing improved ground clearance. The Y-pipe comprises first and second longitudinally flattened or tapered secondary exhaust pipes having respective generally circular cross-section inlet portions connectable to a header assembly and respective laterally bevelled, flattened circular cross-section outlet portions which are affixed together so as to merge together to a single outlet opening which is connectable to the inlet of the boom tube exhaust pipe. The boom tube exhaust pipe comprises a tubular inlet and attached tubular body.

Abstract: An exhaust elbow (1) is provided with a single exhaust outlet (2) with an outlet mounting flange (3) and at least two exhaust inlets (4, 5, 6) with an inlet mounting flange (7) for fastening on the engine block of a motor vehicle. The exhaust guiding of the exhaust elbow (1) between the inlet mounting flange (7) and the outlet mounting flange (3) is formed by a single-walled sheet metal hood (8) forming a collection line. The sheet metal hood (8) surrounds all exhaust inlets (4, 5, 6) together, without individual pipes being formed. Such a simple sheet metal elbow can be manufactured at a low cost and with low weight and nevertheless has sufficient ability to function, is dimensionally stable and can be used in a versatile manner.

Abstract: A connection of the exhaust emission control device, to which a collecting portion of an exhaust manifold extending rearwards and downwards from a rear face of a cylinder block is connected, is eccentric toward an engine block by a distance with respect to an axis of a cylindrical main casing. Therefore, the exhaust manifold can be located as close as possible to a rear face of the engine block to ensure that travel wind is difficult to collide with the exhaust manifold, thereby preventing a drop in temperature of an exhaust gas to early raise the temperature of the exhaust emission control device. Moreover, since the exhaust manifold is disposed closer to the rear face of the engine block, a collision stroke permitting the retraction of the engine upon frontal collision can be expanded.

Abstract: A double exhaust pipe for an engine includes an inner pipe shell, and an outer pipe shell in which the inner pipe shell is accommodated. The inner pipe shell is secured at one end thereof to the outer pipe shell and slidably fitted at the other end thereof to an inner peripheral surface of the outer pipe shell. A heat-insulating space is provided between the inner and outer pipe shells to extend from the one end to the other end of the inner pipe shell. In this double exhaust pipe, the inner pipe shell has a bulged portion formed at the other end thereof. The bulged portion has a spherical outer surface slidably and oscillatably fitted to an inner peripheral surface of the outer pipe shell. Thus, even if the free end of the inner pipe shell is inclined upon thermal elongation of the inner pipe shell, the bulged portion at the free end can always be smoothly slipped on the inner peripheral surface of the outer pipe shell.

Abstract: An exhaust header system for an internal combustion engine having improved exhaust gas flow characteristics. Primary pipes extend from openings in a flange bolted to the engines exhaust ports. The primary pipes come together at a collector pipe into which the primary pipes extend slightly. The ends of the primary pipes are substantially parallel, uniformly spaced around the collector pipe axis and have end surfaces lying substantially in a single plane. A generally pyramidal transition piece has a base corresponding to, and secured to, the primary pile end surfaces so as to cover the area between the pipe ends. The pyramid apex extends along the collector pipe centerline toward the exit end. The length and cross section of the transition piece is selected to provide a smooth transition from the greater combined internal cross section of the primary pipe ends to the lesser cross section of the collector pipe exit end.

Abstract: Disclosed is branch pipes for an exhaust manifold in which a fitting part to be fit into a manifold container comprises a group of pipe members, wherein a cross section of the fitting part of each branch pipe is shaped into a fan-like shape, and the cross sectional area of the branch pipe is substantially equal to that of the branch pipe before the branch pipe is worked.

Abstract: Disclosed is a double pipe exhaust manifold having an inner pipe, a mesh spacer member applied to the outer periphery of the inner pipe, and an outer pipe being disposed around the outer periphery of the mesh spacer member in a state that the outer pipe is axially slidable at least to the inner pipe, wherein the outer pipe is divided into two pipe members, and one side end of one of the divided pipe members is put on the corresponding one of the other of the divided pipe members as radially viewed, and the other side end of the divided pipe member is put on the corresponding one of the latter divided pipe member, and the overlapping portions are welded together.

Abstract: An internal combustion engine, which can be disposed in a water vehicle, includes an exhaust system having features improving the performance, ease of manufacturing, and/or the water preclusive effects thereof. The exhaust system can include an exhaust manifold defining a plurality of exhaust runners and being made from at least two parts. The exhaust system can also include a plurality of individual exhaust passages extending from exhaust ports of the engine to a forward end of the engine. The exhaust system can also include an exhaust passage which extends from the exhaust ports to varying elevations relative to the exhaust ports, as well as other features.

Abstract: Heat shielding panels are attached to exhaust pipes and a silencer by using small set springs and large set springs. Distortion on a heat shielded panel, which would be caused when attaching a heat shielding panel through welding, is not caused. A process for positioning a bracket, which would be required when welding a bracket to an exhaust pipe, can be omitted. Moreover, as no bolt and nut is used, the number of parts can be reduced. As a result, productivity can be improved and an increase in the cost can be suppressed.

Abstract: A built-up airgap-insulated exhaust manifold of an exhaust system of a motor vehicle includes at least two exhaust pipes with an inlet flange attached in each case to one end and to be fastened to the cylinder head of an internal combustion engine of a motor vehicle. The exhaust pipes include a pipe bend and at least one branched pipe piece connected to the latter. If a plurality of branched pipe pieces are arranged they are connected to one another in a row and the last pipe piece in the row forms a header connected at one end to the exhaust tract leading further on in the exhaust system. The exhaust manifold has at least one exhaust pipe, which is designed as a double pipe with airgap insulation between an outer and an inner pipe, and possessing at least one exhaust pipe without an air insulation gap. The outer pipe and the inner pipe of the airgap-insulated exhaust pipe bear against one another at the end which is plugged together with and welded to an associated inlet flange.

Abstract: An exhaust manifold 10 having a body 12 and a plurality of flanges 14-24. The body 12 is separately fabricated apart from flanges 14-24. The flanges 14-24 are later joined to the body and cooperatively form an exhaust manifold 10.

Abstract: An outboard motor has an exhaust pipe assembly extending through a driveshaft housing. The exhaust pipe is separated into an upstream exhaust pipe and a downstream exhaust pipe which are formed separately from each other. The upstream exhaust pipe depends into the driveshaft housing and has a lower end connected to a pipe support member. An upper end of the downstream exhaust pipe connects to the pipe support member in a manner to communicate with the upstream exhaust pipe. The downstream pipe depends through an opening in a bottom wall of the driveshaft housing, and a mount at the lower end of the pipe is connected to the driveshaft housing in order to secure the pipe in place. The upper end of the downstream exhaust pipe is fit into the pipe support member without the use of fasteners. In this configuration, the downstream exhaust pipe can be removed independently of the upstream exhaust pipe, and can be drawn downwardly through the opening during removal.

Abstract: A connector assembly for connecting a catalytic converter assembly to a muffler and tailpipe assembly includes first and second flexible portions, and a middle portion disposed between the flexible portions. The middle portion includes a catalyst element for modifying exhaust gases passing from the catalyst assembly to the muffler and tailpipe assembly.

Abstract: A manifold arrangement for exhaust systems of internal combustion engines, especially multi-cylinder motorcycle engines, for installation between the exhaust gas outlet pipes from the or each cylinder and at least one muffler is configured such that the exhaust gas outlet pipes of the cylinders are combined stepwise, if applicable, so as to finally form one joint pipe where behind the joint pipe a branch is provided that divides the exhaust gas flow into at least two pipes which are separated from each other, are parallel in a flow-wise manner and together having a larger cross-sectional surface than the joint pipe and behind the pipes, parallel a joining element is provided again so as to form one single collector pipe.

Abstract: An exhaust manifold provides improved output by suppressing exhaust interference between cylinders at the exhaust manifold. An air-fuel ratio sensor is installed in position where it can uniformly detect the exhaust gas of each cylinder. The exhaust manifold has a plurality of exhaust tubes, one per cylinder, that connect with a collector case. Each of exhaust tubes has a linear portion located directly above the section where it merges with the collector case. The exhaust tubes are connected to the collector case such that the center axes of the linear portions intersect at intersection point inside the collector case or downstream thereof. The air-fuel ratio sensor is arranged such that its detecting part is positioned in the vicinity of the intersection point. Depending upon whether the exhaust tubes of cylinders have firing orders that are successive or not determines whether the exhaust tubes are slanted or parallel with respect to each other.

Abstract: Manifold pipe assemblies and exhaust manifold assemblies, optionally in combination with internal combustion engines, for receiving hot gases from such heat source, and conveying such hot gases from the heat source toward a lower temperature environment. Such manifold pipe assembly comprises a manifold pipe defining a gas path for conveying hot gases from an inlet end to an outlet end, a jacket pipe encompassing the manifold pipe along a portion of the length of the manifold pipe. The jacket pipe has a second inlet end disposed toward the inlet end of the manifold pipe, and a second outlet end disposed toward the outlet end of the manifold pipe. The jacket pipe is closed about the manifold pipe at the second inlet end, to form a closed cooling chamber between the manifold pipe and the jacket pipe. An inlet pipe conveys cooling liquid into the cooling chamber.

Abstract: An exhaust device for internal combustion engines, having a main catalyst, an auxiliary catalyst, and an exhaust manifold connecting the input of the main catalyst to the exhaust outlets of the internal combustion engine, so as to feed the exhaust gases from the exhaust outlets to the main catalyst; the exhaust manifold assuming a first operating configuration connecting the input of the main catalyst to the output of the auxiliary catalyst, and the input of the auxiliary catalyst to the internal combustion engine, and a second operating configuration connecting the input of the main catalyst directly to the internal combustion engine and excluding the auxiliary catalyst.

Abstract: The invention relates to an exhaust-gas muffler on an internal combustion engine in a motor chain saw. The exhaust-gas muffler includes a housing (1) which is assembled of two housing shells (2, 3). The one housing shell (2) has an exhaust-gas inlet (4) and the other housing shell (3) has an exhaust-gas outlet (5). An inner wall (8) as well as a catalytic converting element (7) are provided in the inner space (6) of the muffler housing (1). The catalytic converting element (7) is mounted between the exhaust-gas inlet (4) and the exhaust-gas outlet (5). In order to ensure an adequate catalytic converting treatment of the exhaust gas at low gas counterpressure, it is provided to divide the entering exhaust-gas flow (10) and to conduct at least one of these component flows (23) in contact with the catalytic converting element (7). The component flows (22, 23) are brought together and mixed with other before exiting from the muffler housing (1).

Abstract: An air gap insulated exhaust manifold for an internal combustion engine of a motor vehicle that has a catalytic converter. The exhaust manifold includes an inner pipe and an outer pipe with a connecting flange on the cylinder head side of the outer pipe. The outer pipe encloses the inner pipe and is spaced therefrom at a distance. A pipe end of the inner pipe protrudes in a guided manner into the cylinder head and only the outer pipe is fastenable to the cylinder head by way of the connecting flange.

Abstract: Various installation arrangements for internal combustion engines, for example, may require a variety of different connection arrangements for fluid flow apparatus such as intake/exhaust manifolds, coolant flow apparatus, and the like. Consequently, a range of fluid flow bodies and connectors may be required for each engine model, leading to high unit costs and large inventories. An adaptable fluid flow apparatus according to this invention includes a fluid flow body and an elbow connector. The elbow connector can be mounted to the body in at least three positions so that the flow axis of the elbow connector lies along one of three substantially orthogonal axes. Moreover, the elbow connector can be positioned so that its flow axis lies either substantially parallel to or transverse to the longitudinal axis of the fluid flow body.

Abstract: In a vehicle exhaust system, downstream end portions of front and rear exhaust pipes Ef, Er which respectively connect to front and rear cylinder banks are arranged side by side with each other in the same direction so as to be connected to a common collecting exhaust pipe 22, so that exhaust gases flowing through the front and rear exhaust pipes Ef, Er are allowed to flow into the common collecting exhaust pipe 22 in the same direction. Mating faces 15f, 20f are respectively formed on the end portions of the front and rear exhaust pipes Ef, Er which are located closer to the collecting portion, and the mating faces 15f, 20f are confronted from each other. The mating faces are inclined relative to a plane (P-P) passing through centers Ca, Cb of the front and rear exhaust pipes Ef, Er.

Abstract: An exhaust manifold for conducting heated exhaust gas from an internal combustion engine to an exhaust system. The exhaust manifold includes a preform and a metal layer enclosing the preform. The preform has an inner layer of silicon carbide, a middle layer of insulating material, and an outer layer to seal the middle layer from molten metal used to form the metal layer.

Abstract: A method for manufacturing an air-gap-insulated exhaust pipe having a branch stub, as well as an exhaust pipe produced according to such a method and a tool for forming such an exhaust pipe. Two tubes are inserted into one another to form a double tube. The double tube is placed in a first internal high-pressure shaping tool, and exposed to internal high pressure fluid such that it expands to match the contours of the engraving of the first shaping tool, and a double-walled branch stub is blown out of the double tube. The partially formed double tube is then placed in a second internal high-pressure shaping tool, with the double tube being surrounded, between the two ends including the branch stub, circumferentially and throughout by a corresponding design of the engraving, by an expansion chamber.

Abstract: An exhaust gas system includes a collector for joining exhaust gas flows from two or more cylinders of a combustion engine. The collector has an outlet cross-section behind which a tubular jacket is disposed. A honeycomb body is disposed in the tubular jacket. A space through which a flow is to take place is defined between the outlet cross-section and the honeycomb body. At least one guide surface is disposed in the space for diverting at least a part of the exhaust gas flows. A method is provided for applying exhaust gas flows to a honeycomb body. The flows arrive at the honeycomb body at least partly from different directions. The exhaust gas flows are diverted by at least a first guide surface, before they impinge upon the honeycomb body, in such a way that they flow in a direction at least partly opposite to that of the exhaust gas flows, and their incidence upon the honeycomb body is thus delayed.

Abstract: In a catalyzer arrangement in an exhaust system of a multi-cylinder internal combustion engine, each of exhaust pipes connected with exhaust ports of the engine has a first exhaust pipe section extending away from a main body of the engine, a second exhaust pipe section contiguous to the first exhaust pipe section having a first curved portion for turning the second exhaust pipe section toward the main body of the engine, and a third exhaust pipe section contiguous to the second exhaust pipe section having a second curved portion for turning the third exhaust pipe portion away from the main body of the engine. A catalyzer is connected to a downstream side of the third exhaust pipe section and disposed within a space surrounded by the first, second and third exhaust pipe sections. The exhaust pipes are divided into one group positioned near one end of a row of cylinder of the engine and another group positioned near another end of the row of cylinder.

Abstract: A stratified exhaust gas re-circulation (EGR) engine uses an exhaust port per cylinder for exhausting exhaust gases and to re-circulate exhaust gas. The EGR valve may be phased from the exhaust stroke to the intake stroke. The EGR valves that control the exhaust gas re-circulation ports may be on a separate camshaft from the other valves. The EGR ports and an intake port for each of the cylinders may be helical or tangential ports that stratified the exhaust gas and the air in the cylinder. The engine may be a direct injection or a port fuel injection engine with one or more exhaust manifolds. The exhaust gas re-circulation ports may be controlled by a single flow valve or each port may have a separate flow valve. The intake ports may be controlled by a single flow valve or each intake port may have a separate flow valve.

Abstract: An apparatus and method of attaching an exhaust manifold to an engine's cylinder head utilizing an oversized hole in the manifold, a stud fastener extending through the oversized hole, a spacer element around the stud fastener, and a nut adapted to be tightened to engage the spacer element and the flange wherein a flat gasket is compressed to a desired extent which is not so excessive that it inhibits sliding movement caused by thermal growth of the manifold.

Abstract: An uncoupling element is proposed for uncoupling vibrations in an exhaust gas conduit of an internal combustion engine, having a screw thread-shaped or annular waved, metal corrugated hose, which is inserted between a first conduit element arranged upstream and a second conduit element arranged downstream.

Abstract: An exhaust manifold for a combustion engine which includes a flow deflector member to redirect the flow of exhaust through the catalytic converter in the exhaust system. The deflector member is in the shape of a ring conforming to the inner diameter of the manifold for secure mounting therein. The deflector ring has a center opening and an inwardly angled deflector wall which directs flow through the opening. Exhaust flow along the walls of the manifold is redirected inwardly by the deflector ring to optimize flow distribution through the exhaust system.

Abstract: An exhaust manifold which includes a flange to be fixed on an engine cylinder head. A wide exhaust gas collecting cavity is connected to the flange to receive exhaust gases discharged by exhaust pipes of the cylinder head. The wide collecting cavity has a recessed wall element subdividing the cavity into two mutually communicating sub-cavities. An end portion is connected to the collecting cavity outlet and has a discharge outlet for the exhaust gases.

Abstract: An exhaust system which unexpectedly increases engine performance significantly contains multiple tracts for exhaust gases to travel within upon exiting an internal combustion engine. The multiple tracts can be made of individual tubes or contained in a single manifold device. The multiple tracts are comprised of a plurality of primary tracts which are connected in flow communication to the internal combustion engine. As exhaust gases are expelled from the engine, the gases travel down the primary tracts into several secondary exhaust tracts which branch from each of the primary tracts downstream of the engine. Both the primary and secondary tracts can be of generally any tubular cross-section. Additionally, the secondary exhaust tracts can range in virtually any number of tracts and geometric configuration and is limited only by space considerations.

Abstract: An exhaust header system for an internal combustion engine having improved exhaust gas flow characteristics. Primary pipes extend from openings in a flange bolted to the engines exhaust ports. The primary pipes come together at a collector pipe into which the primary pipes extend slightly. The ends of the primary pipes are substantially parallel, uniformly spaced around the collector pipe axis and have end surfaces lying substantially in a single plane. A generally pyramidal transition piece has a base corresponding to, and secured to, the primary pile end surfaces so as to cover the area between the pipe ends. The pyramid apex extends along the collector pipe centerline toward the exit end. The length and cross section of the transition piece is selected to provide a smooth transition from the greater combined internal cross section of the primary pipe ends to the lesser cross section of the collector pipe exit end.

Abstract: A double exhaust pipe for an engine includes an inner pipe shell, and an outer pipe shell in which the inner pipe shell is accommodated. The inner pipe shell is secured at one end thereof to the outer pipe shell and slidably fitted at the other end thereof to an inner peripheral surface of the outer pipe shell. A heat-insulating space is provided between the inner and outer pipe shells to extend from the one end to the other end of the inner pipe shell. In this double exhaust pipe, the inner pipe shell has a bulged portion formed at the other end thereof. The bulged portion has a spherical outer surface slidably and oscillatably fitted to an inner peripheral surface of the outer pipe shell. Thus, even if the free end of the inner pipe shell is inclined upon thermal elongation of the inner pipe shell, the bulged portion at the free end can always be smoothly slipped on the inner peripheral surface of the outer pipe shell.

Abstract: An outboard motor features a v-type internal combustion engine having a generally vertically extending crankshaft. Exhaust gases from combustion chambers are routed through a set of exhaust manifolds positioned within the valley defined by the two banks of cylinders. The exhaust flow is merged within a passage formed in the cylinder block prior to passing the exhaust flow into a passage formed within an exhaust guide plate to which the engine is mounted. The merged flow passage is positioned to allow a compact outboard motor construction. The motor also features a cooling pattern by which the exhaust manifold runners, the exhaust manifold, the cylinder head, the valley and the cylinders are cooled in that order.

Abstract: A non-metallic vehicle gas-directing component includes a plurality of ceramic members embedded within an inner surface. The ceramic members extend into a passageway to form a boundary layer between the flow of exhaust gas and exposed portions of the inner surface to provide a highly heat resistant and lightweight passageway for directing a high temperature gas. A method for producing the vehicle gas-directing component includes temporarily attaching a plurality of ceramic members to an inner mold core during a lost core molding process. In one disclosed embodiment, the ceramic members are temporarily attached directly to the inner mold core by an adhesive. In another disclosed embodiment, the plurality of ceramic members are attached to an inner contour of a core casting cavity by an adhesive.

Abstract: A joint assembly for a pressurized, multi-sectional exhaust manifold comprising a joint member, tubular in cross section having a first end and a second end and a throughbore extending therethrough, the outer circumference of the joint member being less than the inner circumference of adjoining exhaust manifold sections, there being formed on the joint member proximate the first end and the second end a plurality of circumferential grooves for receipt of a plurality of sealing rings, the joint member and sealing rings being frictionally secured within adjacent ends of exhaust manifold sections.

Abstract: An exhaust manifold of an internal combustion gasoline engine includes first, second, third and fourth runners and mixing pipe, one end of each runner being connected to a cylinder head and another end of each runner being connected to the mixing pipe wherein the runners are connected to the mixing pipe in a longitudinal direction such that exhaust gases are introduced into the mixing pipe without colliding into an inner wall of the mixing pipe.

Abstract: An exhaust manifold integrally cast with a turbine housing for a turbocharger has pipe portions having exhaust gas flow paths and a plurality of ports adapted to receive an exhaust gas; flanges respectively extending from the ports; a converged portion connected to the pipe portions and adapted to converge the exhaust gas flow paths in the pipe portions; and a turbine housing integrally connected to the converged portion and having a circular exhaust gas flow path therein. The exhaust gas flow path in the converged portion is in a tangent direction relative to the circular exhaust gas flow path in the turbine housing. A neck portion that connects an outer surface of the turbine housing to an outer surface of the converged portion at a particular angle has a radius of curvature that is relative to the distance in a tangent direction of the exhaust gas flow path from the center of the turbine housing to the converged portion.

Abstract: An exhaust manifold flange for an internal combustion engine, for sealably connecting at least one stub pipe of an exhaust manifold to a wall of the engine, the flange has a basic part made of sheet steel provided with a bead which extends substantially around the entire outer contour of the basic part, at least one receiving hole with another bead therearound for securely receiving the at least one stub pipe in the manifold which has holes which are arranged for attaching the exhaust manifold flange to the wall of the internal combustion engine.

Abstract: An air gap-insulated exhaust manifold with a double-walled design provided only in the area of the collection pipe, while only a single-walled design is provided in the area of the individual pipes. The outer pipe includes two half shells, while the gas-carrying inner pipe is manufactured especially from one or more partial sections according to the inner high-pressure process.

Abstract: An exhaust manifold is constructed of material varying in thickness. Auxiliary cooling, such as from an air flow, to a portion of the exhaust manifold, permits making this portion thinner than a portion shielded from the auxiliary cooling. This lowers the heat capacity of the thinner material, allowing the exhaust manifold to heat rapidly to the activation temperature of a catalyst. Thus, the catalyst is capable of removing harmful elements from the exhaust gases of an internal combustion engine more quickly, thereby reducing pollution to the atmosphere. Furthermore, an exhaust manifold having this structure is lighter and requires less material than conventional exhaust manifolds, thereby making production easier and less costly.