Abstract: An exhaust double pipe used for interconnecting an exhaust manifold with a catalytic converter of an internal combustion engine, comprising an inner pipe and an outer pipe. The outer pipe comprises a first pipe and a second pipe. The outer end of the first pipe is welded to a flange together with one end of the inner pipe. The outer end of the second pipe is welded to another flange together with the other end of the inner pipe. The inner end of the first pipe is directly fitted into the inner end of the second pipe, or is indirectly connected to the inner end of the second pipe via a spacer so as to be able to slide relative to the second pipe.

Abstract: The disclosure is relative to an improved fitting structure of an exhaust manifold to a cylinder head of an integral combustion engine for an automobile, in which enough clearance is provided between each of fitting holes, formed in the exhaust manifold and a gasket allowing a bolt to pass therethrough, and the bolt to prevent the exhaust manifold from contacting the bolt even when the exhaust manifold is thermally expanded and a low frictional thermostable member is inserted into at least one of two places, between the exhaust manifold and the gasket and between the exhaust manifold and the bolt head or a nut. The expansion of the exhaust manifold is not restricted by bolts when it is thermally expanded but is slidably displaceable freely along the surface of the cylinder head, therefore, no crevices are formed between the exhaust manifold and the cylinder head.

Abstract: A method and apparatus for insulating the exhaust passage of an internal combustion engine is disclosed. A three-zone liner assembly is provided with an outer zone comprised of a room temperature vulcanizing silicone sleeve, an inner zone comprised of a stamped and seam welded high strength Al-Cr-steel alloy, and an intermediate zone consisting of a ceramic wool mat. The liner assembly is supported or enclosed within a mild carbon sheet metal sleeve metal which in turn may be bonded to the engine passage wall by use of a room-temperature-vulcanized silicone if of the insert type, or by fusion bonding during casting if of the cast-in-place type.

Abstract: An exhaust manifold for a supercharged internal combustion engine which includes inner pipes carrying the exhaust gases from the engine and a water-cooled housing surrounding the inner pipes at a predetermined spacing. The housing is mounted to exhaust gas flanges of the internal combustion engine by way of water-cooled intermediate flanges. The housing includes an opening on a side thereof facing away from the engine with the opening extending approximately over the entire length of the housing and being closable in a gas-tight fashion by a cover. The housing is bolted to the exhaust gas flanges from the inside thereof and the inner pipes are formed of individual pipe segments assembled with plug connections with the length of the various pipe segments corresponding approximately to the cylinder spacing of the internal combustion engine.

Abstract: A connector for interengaging the exhaust header components of an internal combustion engine that are subjected to movement and vibration to a turbine compressor and/or tail pipe components that are constrained and relatively unmoving wherein inner and outer sleeves of generally telescoping type are separately joined to said moving and constrained components by angular misalignment compensating ball socket joints held in assembled relation with said components by mating flanges. Said inner and outer sleeves further cooperatively provide a close interfitting engagement between a smooth cylindrical surface on one sleeve and a plurality of spaced circumferential ribs on the other sleeve to provide spaced apart pressure sealing zones whereby the pressure of any escaping exhaust gases are reduced by stepped gradients.

Abstract: An exhaust manifold assembly for an internal combustion piston engine employs one exhaust tube for each cylinder and a collection chamber for each pair or larger group of exhaust tubes. Each collection chamber is connected to a plurality of exhaust tubes so that the exhaust timing spacing is the same in each collection chamber. A single exhaust reaction chamber is fed from pipes carrying the discharge from each collection chamber. The effect is to reduce backpressure and to improve scavenging efficiency while maintaining relatively high exhaust gas temperature for purification efficiency. The upstream end of each exhaust tube is supported and sealed within an engine exhaust port and the discharge end of each exhaust tube is slidably received within its collection chamber.

Abstract: An exhaust pipe having an axial compensator is provided with means for preventing bending of the axial compensator. This means includes at least one sleeve which is secured to one of the parts of the pipe and a mandrel slidably received by the sleeve and secured to the other part of the pipe, so as to allow axial movement of the parts. Both sleeve and mandrel may be pivotally secured to the parts to allow adjustment in the angle of inclination relative to the axial compensator.

Abstract: The exhaust pipe has an axial compensator to compensate for changes in length in the elongated part as well as a pair of props which compensate for changes in length in the bent parts. The props are each articulated to a fixed support point and to the axially elongated part of the pipe. In addition, the props are disposed in different planes relative to each other.

Abstract: The exhaust gas purification device includes an exhaust manifold, a purification cylinder connected with the exhaust manifold through a first honey-comb shaped catalyst, and a second honey-comb shaped catalyst positioned at the rear portion of the purification cylinder. Each catalyst is supported by steel wool rings including coarse and dense portions of steel wool. The purification device further includes a secondary air supplying arrangement.

Abstract: A catalytic muffler is formed by winding together a pair of relatively thin catalytically active foils one of which is corrugated. The wound-together foils are secured together by nondeposit welding to form a rigid insert having longitudinally throughgoing gas passages. This insert is then fitted into a cylindrical housing and welded to the housing once again using a beam-type welder.

Abstract: An exhaust double pipe used for interconnecting an exhaust manifold with a catalytic converter of an internal combustion engine, comprising an inner pipe and an outer pipe. The outer pipe comprises a first pipe and a second pipe. The outer end of the first pipe is welded to a flange together with one end of the inner pipe. The outer end of the second pipe is welded to another flange together with the other end of the inner pipe. The inner end of the first pipe is directly fitted into the inner end of the second pipe, or is indirectly connected to the inner end of the second pipe via a spacer so as to be able to slide relative to the second pipe.

Abstract: In a multi-cylinder, in-line, internal combustion engine, the cylinder head has a plurality of exhaust ports, and these ports are connectable to the inlet pipe sockets of an exhaust manifold; the exhaust manifold has a respective attaching flange at each exhaust port for attaching the exhaust manifold to the cylinder head; compression straps stretch over the flanges; securement screws pass through the compression straps and through the flanges into the cylinder head; each flange having a pair of spaced apart fork lugs, between which its screw passes; these give lateral play to the respective flange which absorbs the thermal expansion and contraction of the manifold with respect to the cylinder head.The present invention relates to a device for connecting an exhaust manifold with the cylinder head of a multi-cylinder, usually in-line, internal combustion engine.

Abstract: An exhaust manifold for an internal combustion engine is provided with internal insulation so as to maintain the outside skin temperature preferably below 450.degree. F. The manifold is provided with an exhaust conduit or lining that is comprised of interfitting relatively axially movable sections in contact with the exhaust gases. A low specific gravity or porous sleeve of insulating material is fitted in slightly spaced relationship around the exhaust conduit. The sleeve of insulating material may be wrapped to prevent the metal of the outer cast manifold housing from penetrating the insulation. Each section of the exhaust conduit has a branch for connection to a flanged nipple which is permitted some limited movement relative to the manifold housing when connected to the exhaust ports of the engine.

Abstract: The exhaust manifold for a transversely mounted automobile engine terminates adjacent to the engine in an outlet having an articulated connection with the inlet of an exhaust header that terminates in an exhaust pipe discharging to the atmosphere.The articulated connection comprises an annular coupling portion having a spherical surface at the header inlet seated in sealing engagement with a downstream enlarging conical sealing surface defining the manifold outlet. An annular flange adjacent to the inlet of the header may be seated in sealing engagement against a second sealing surface of the annular coupling portion. The sealing engagements may be maintained by a collar yieldingly urged against the annular flange by spring means that engage the collar at spaced locations on a line parallel to the roll axis of the engine and passing through the center of the first named spherical surface.

Abstract: A water-cooled engine exhaust manifold has an internal exhaust conduit or heat sheild comprised of a plurality of axially shiftable sections through which the hot exhaust gases pass from the engine to a hot gas turbocharger. A casing encircles the exhaust conduit and is held in spaced relationship to the exhaust conduit so as to provide dead air space or other insulating material space for insulating the hot exhaust gases from the casing. An outer shell encircles the casing and is sealed to exhaust inlet elbows and to fluid inlet flanges to provide a water jacket to cool the surface of the casing. The exhaust inlet elbows communicate with each different section of the exhaust conduit. Clearance is provided between the ends of each section of the exhaust conduit to permit expansion and axial shifting of the sections of the exhaust conduit without, in any way, interfering with the function and operation of the fluid-cooled jacket of the manifold.

Abstract: A manifold for internal combustion engines is provided which has a unique insulation system for maintaining a skin temperature of the manifold below 400.degree. F. The manifold includes an exhaust conduit made up of axially spaced and aligned segments with provision for preventing excessive leakage of exhaust gases between the spaced segments. Each segment has an exhaust port extending at an angle thereto. Two or more members of corrugated or crumpled thin foil are concentrically arranged about the ports and about the conduit with air gaps between the conduit and the innermost member, between the port and the innermost member, and between each member. An outer casing is cast about the members and embeds the ends of the members therein. The foil from which the members are made is polished on the surfaces to be highly reflective thereby reducing the transfer of heat through the successive concentric members. A method of manufacturing the improved insulated manifold is provided.

Abstract: A method and apparatus for insulating the exhaust passage of an internal combustion engine is disclosed. A three-zone liner assembly is provided with an outer zone comprised of a room temperature vulcanizing silicone sleeve, an inner zone comprised of a stamped and seam welded high strength Al-Cr-steel alloy, and an intermediate zone consisting of a ceramic wool mat. The liner assembly is supported or enclosed within a mild carbon sheet metal sleeve which in turn may be bonded to the engine passage wall by use of a room-temperature-vulcanized silicone if of the insert type, or by fusion bonding during casting if of the cast-in-place type.

Abstract: A structure for mounting an exhaust manifold of the type having a plurality of branch tubular portions and a continuous strip-like flange portion which joins the free end portions of the branch tubular portions to the body of an internal combustion engine, wherein only opposite end portions of the strip-like flange portion are positively fastened to the body of the engine.

Abstract: A catalytic converter unit of the type used in internal combustion engine exhaust systems has a monolithic refractory catalyst element which is axially retained by means of annular spring washers.

Abstract: An exhaust pipe for connecting an exhaust gas outlet of each of a plurality of in-line cylinders of a turbo-supercharged internal combustion engine to a turbine of an exhaust gas turbo-supercharger. The exhaust pipe comprises four separate pipe strings having parallel axes located at the corners of a substantially equal-sided quadrilateral, a branch pipe for connecting the exhaust-gas outlet of each cylinder to the pipe strings, each branch pipe leading to one of the two corners of one side of the quadrilateral, and a connecting part provided in the pipe strings, said connecting part being arranged to twist the pipe strings whereby the parallel portions of an upstream part of the pipe strings and associated with that side of the quadrilateral remote from said one side communicate with the parallel portions of a downstream part of the pipe strings and associated with said one side of the quadrilateral.

Abstract: A support for a heat insulator material being disposed between an outer core of a re-combustion chamber and a manifold reactor housing thereof being formed by a grommet capping the edge of the heat insulator around the inlet ports of the housing, wherein the grommet is provided with an opening for loosely holding a port liner and is disposed between the housing and the outer core and has a deformable peripheral portion which substantially encloses and engages the heat insulator in a gap created by said deformable edge portion.

Abstract: An exhaust double pipe used for interconnecting an exhaust manifold with a catalytic converter of an internal combustion engine, comprising an inner pipe and an outer pipe. The outer pipe comprises a first pipe and a second pipe. The outer end of the first pipe is welded to a flange together with one end of the inner pipe. The outer end of the second pipe is welded to another flange together with the other end of the inner pipe. The inner end of the first pipe is directly fitted into the inner end of the second pipe, or is indirectly connected to the inner end of the second pipe via a spacer so as to be able to slide relative to the second pipe.

Abstract: An exhaust port liner system for an engine having an exhaust port with a common outlet and a dual inlet for the exhaust of two adjacent cylinders wherein an exhaust port liner is positioned within the exhaust port with a clearance about its periphery between the exhaust port and the exhaust port liner. A portion of the exhaust port liner has two legs with a space between them. The exhaust port liner is secured to the exhaust port at the common exhaust port outlet, and each leg is fitted and supported at the outer sides of the two exhaust port inlet sidewalls.

Abstract: A connection system for a connection between an exhaust port of an internal combustion engine and an intake port of a thermal reactor for substantially purifying exhaust gases emitted from the engine. An engine casing has an exhaust passage accommodating therein a tubular insert while the thermal reactor has an intake pipe leading into a reaction chamber. The tubular insert has a radially outwardly extending flange on one end and the intake pipe has a radially outwardly extending flange on one end. When the thermal reactor is operatively coupled to the engine, the flange on the tubular insert and the flange on the intake pipe are coupled to each other with a heat transmitting connecting member therebetween. An annular portion of the flange on the intake pipe is, when the reactor is thus coupled to the engine, allowed to elastically deform to generate a force with which the intake pipe and the tubular insert are relatively fixedly restrained in position.

Abstract: Pipes undergoing torsion stresses at one fixed extremity, the other extremity being flexibly supported, and in particular, exhaust pipes for motor vehicles. The concentration of stresses at the fixed end are eliminated and distributed in the center of the pipe by reinforcing its moment of inertia and its rigidity at the fixed extremity, and by creating a series of localized zones with a reduced moment of inertia in the center area, where the stresses undergone by the pipe at its fixed end are distributed in limited fashion. The invention is especially applicable to the exhaust pipes of internal combustion engines.

Abstract: Disclosed herein is a liner for an exhaust port system of an internal combustion engine for reducing heat loss from the exhaust gas to facilitate combustion of unburned hydrocarbons (HC) and oxidation of unburned carbon monoxide (CO). The exhaust port liner is rigidly secured at one end thereof to the exhaust port and is supported at its other end by means of a peripheral sealing ring to provide an airtight liner which is free sliding at said other end to accommodate expansion and contraction of the exhaust port liner by the exhaust gas passing therethrough.

Abstract: A manifold reactor used for the purpose of cleaning the exhaust gas emitted from an automobile or any other internal combustion engine-driven vehicle, which is constituted of three shells, i.e, an inner shell or baffle, an intermediate shell and an outer shell. The construction of said manifold reactor allows the inner shell and the intermediate shell to freely expand or contract in any direction in relation to the outer shell by virtue of a suspension structure with a suspension bolt that fixes the inner shell and the intermediate shell in a central place within the outer shell thus avoiding thermal stress due to heat of the exhaust gas.

Abstract: A bracket member is provided on a portion of a cylinder block of an engine for tightly supporting both an outlet duct of a thermal reactor and an end portion of an exhaust tube.

Abstract: A manifold type thermal reactor, for use in an internal combustion engine mounted on cars or other vehicles to collect exhaust gas from a plurality of engine cylinders into a reaction chamber is described. The chamber includes an external shell and an internal shell. The thermal reactor includes an external tubular pipe connecting at least one of the cylinders with the reactor and an inlet pipe connecting the tubular pipe with one of the openings formed in the internal shell. The angle between the axis of the inlet pipe and the axis of the internal shell is more than 0.degree. and less than 90.degree.. A gas-tight clearance is provided to allow sliding of the inlet pipe relative to a circular opening in the internal shell in the direction of the axis of the inlet pipe.

Abstract: An exhaust manifold for a multi-cylinder engine employs three concentric exhaust reaction chambers. Exhaust inlet pipes convey hot exhaust gases from the exhaust ports of the engine directly into the innermost reaction chamber. The concentric reaction chambers extend substantially at right angles to the exhaust inlet pipes which are parallel. Concentric tubes encircle the exhaust inlet pipes and each is connected to one of the concentric exhaust chambers. The flared portions of the exhaust inlet pipes engage in surface contact with the correspondingly flared portions of the tubes. End members having concentric shoulders engage cylindrical shells which define the exhaust reaction chambers. Bolted spacers are positioned substantially midway of the length of the shells and space them in concentric fashion.

Abstract: A manifold reactor having inner and outer cores, the latter enclosing the former, the outer core having an inlet tube while the inner core having a tubular inlet portion, the inlet tube and the inlet portion being telescoped with each other, wherein an annular seal element made of a metal sheet or sheets is provided between telescoping portions of the abovementioned two members, with one peripheral portion of the annular seal element being connected to one of the two telescoping members, while the other peripheral portion of the annular seal element being elastically and slidably engaged with the other of the two telescoping members.

Abstract: The exhaust pipe includes a flexible section adjacent its upstream end and is connected to the exhaust manifold. A support fixed to the part of the exhaust pipe immediately adjacent the flexible section is connected to the engine by a flexible connection.

Abstract: In a manifold reactor for an internal combustion engine, the reactor including an inner core and an outer core of elongated cylindrical form, the inner core having open, opposite ends and being concentrically placed within the outer core in spaced relation from the walls of the outer core both in the radial direction and in the axial direction; exhaust gas intake pipes extending from engine cylinders through the walls of the outer and inner cores so as to open within the inner core; and at least one exhaust-gas-discharge pipe, having one end open to an annular space defined between the wall of the outer core and the wall of the inner core, the inner core is split in the axial direction into at least two cylindrical parts which are slidingly connected to each other in air-tight relation, each part being independently secured by welding to the inner surface of the cylindrical wall of the outer core by means of supporting members.

Abstract: A supporting device for a port liner through which engine exhaust gas is introduced into a manifold reactor. This supporting device comprises at least one projection for supporting the port liner between the cylinder head fixture and the outer shell of the manifold reactor.

Abstract: Heat insulating apparatus for an exhaust pipe of an internal combustion engine to maintain exhaust gases at high temperature to reduce unburned constituents. The apparatus is so arranged as to permit the thermal expansion of the exhaust pipe. The exhaust pipe is located with a heat insulating material which in turn is coated with a cover. One end of the cover is secured to the exhaust pipe and the other end is slidably engaged with the exhaust pipe.

Abstract: A port liner assembly comprises a tubular liner embedded in a cylinder head block as its moulding so as to be integrally formed into a heat-insulation wall surrounding an exhaust port formed in said cylinder head block, said tubular liner consisting of an outer tube and an inner tube spaced inside of said outer tube.

Abstract: An exhaust manifold reactor assembly usable for reducing noxious emissions from the exhaust system of an internal combustion engine includes a reactor casing having a generally longitudinal cylindrical shape in flow communication between the exhaust port of the engine and the exhaust pipe of the exhaust system. An internal concentric core of similar shape is fixedly connected to the reactor casing at the midpoint of its length, and a second connection enabling longitudinal sliding engagement between the core and the casing is provided at another location off-center from the casing midpoint.

Abstract: A device for the after-burning of combustible components of engine exhaust gases, particularly for mounting on an engine block of an Otto engine, comprises a reactor housing which has an interior elongated reaction chamber. The reaction chamber is divided by a perforated bottom plate which extends across the reaction chamber and divides it into first and second chamber portions. An exhaust gas conduit is connected into the first chamber portion along with a secondary combustion air supply conduit, and the second chamber portion is connected to a treated gas discharge conduit for conducting away from the gases. The exhaust gas conduit is made very short and it has a flange thereon for mounting the device directly on the combustion engine block. The plate is perforated, and it includes one or more plate portions which permits the portions to be displaced relatively in order to accommodate any thermal expansion and contraction.

Abstract: An intake and exhaust system for an internal combustion engine of the type having an auxiliary combustion chamber associated with each main combustion chamber, and wherein the overall air-fuel charge to all combustion chambers is leaner than the stoichiometric ratio, so that excess air is present in the exhaust gases. The system includes integrated intake manifolds, one for connection with the main combustion chamber and the other for connection with the auxiliary combustion chamber, and an exhaust manifold for connection with the main combustion chambers. The exhaust manifold includes a stainless steel liner enveloped within and spaced from a metal casting in order to retain the heat of the exhaust gases so that the exhaust gas temperature remains at or above the temperature at which the unburned hydrocarbons in the exhaust gases will continue to burn. This temperature also promotes oxidation of carbon monoxide to carbon dioxide.

Abstract: A manifold system for a multi-cylinder internal combustion piston engine has an intake manifold for supplying a lean mixture to the main combustion chambers of the engine and a rich mixture to the auxiliary combustion chambers thereof. In such an engine, each main combustion chamber is connected to its respective auxiliary combustion chamber through a torch opening. The manifold system also includes an exhaust manifold having improved means for heating the lean mixture and the rich mixture in the intake manifold, and constructed to provide a longer residence time for the exhaust gases and to promote a high mean temperature so that the chemical reaction between the excess air and carbon monoxide and unburned hydrocarbons may add additional heat, to the end that exhaust emissions to the atmosphere of carbon monoxide and unburned hydrocarbons are minimized.

Abstract: A thermal reactor comprising a shell, an outer core in the shell, an inner core supported by the outer core, an inlet pipe being fixed to the shell and extending through the outer and inner cores, and an outlet pipe. A convex portion on the periphery of the outer core is slidably supported in a concave portion provided on the shell and one end of the inner core is slidably supported on the periphery of the outer core. The outlet pipe is fixed to the shell and the outer core. Therefore, relative movements caused by the thermal deformations are permitted between the shell and the outer and inner cores, while generations of noise and vibration of each member are prevented.

Abstract: The invention concerns a reactor for afterburning of unburned constituents in the exhaust of an internal combustion engine, consisting of a jacketed heat-insulated reactor chamber into which at least one inlet pipe passing through the jacket and communicating with an outlet passage of the engine opens tangentially, being traversed by exhaust gases mixed with secondary air, and having an outlet pipe for escape of exhaust gases from the reactor chamber. The reactor chamber in cylindrical in shape and the inlet pipe opens into the reactor chamber tangentially and the outlet pipe is passed out of the reactor chamber tangentially from the inlet pipe in the direction offset of flow.

Abstract: The invention is concerned with a slip joint connection between an exhaust manifold attached to an engine which is resiliently mounted to a vehicle frame and an exhaust outlet member which is rigidly mounted to the vehicle frame. The connection comprises an exhaust outlet sleeve rigidly mounted to said engine in flow communication with the manifold having a first peripherally extending portion. The connection further includes a hollow piston having a second peripherally extending portion adjacent a first end thereof and having a generally spherical external surface adjacent a second end thereof, the diameter of the spherical surface being substantially equal to the internal diameter of the sleeve, the second end of the piston being received in generally tight relation within the sleeve. Also a part of the connection is a conduit rigidly mounted in flow communication with the exhaust outlet member and having an inlet end adapted to abut in generally tight relation against the first end of the piston.

Abstract: The thermal reactor comprising a shell, a core in the shell, an inlet pipe being fixed at one end to the shell and extending sealingly through the core, and an outlet pipe. A convex portion on the periphery of the core is slidably supported in a concave portion formed in the shell and the outlet pipe is fixed thereto and to the core, thereby permitting relative movements therebetween due to thermal deformation and preventing generation of noise and vibration of each member.

Abstract: An exhaust reactor manifold having a reaction chamber formed by a hardened insulative ceramic liner which is supported within a protective housing. The liner walls are protected and insulated by compessible fibrous insulation. Springs and wedges in the housing act through the insulation blanket to load the liner walls in compression. Inlet and exhaust ports are provided through angled sealing surfaces of the liner which are urged by the compressive loading of the liner into engagement with mating surfaces of a ported mounting portion of the housing.

Abstract: Spacers formed from mica are disposed in a catalytic converter between a monolithic ceramic catalyst element and a metal converter housing. As the converter warms, the spacers increase the compressive loading on the catalyst element to support and immobilize it within the housing.

Abstract: A manifold exhaust gas reactor for purifying exhaust gas produced in an internal combustion engine comprising an outer core and an inner core both usually made of metal plate and defining therebetween a recombustion chamber for exhaust. A plurality of screws pierce through the wall of said reactor casing in order to fit the outer core and each screw-head adjustably urged on the outer surface of said outer core in slidingly contacting relation thereto so that the outer core can be protected from stress either in the longitudinal direction or in the radial direction by adjusting said outer core fixing screws.

Abstract: A new filter structure is provided for removing particles from the exhaust gas of a large, single piston engine of low RPM, before passing the exhaust gas through a turbine for the purpose of driving a supercharger. The filter is so constructed as to be able to efficiently and reliably perform its filtering function over long periods of time in the high temperature environment of the piston engine exhaust. It comprises a cylindrical shaped housing having at one end longitudinally extending slits distributed around its circumference and at the other end an annular flange for mounting the filter in the exhaust line. The housing encloses a filter element comprising a hexagonal stacked array of cylindrical tubes and said filter element is retained in said housing by means of multiple resilient brackets, each formed in the shape of an open elongated loop so as to conform generally to the contour of the filter element on one hand and the inside of the housing on the other.

Abstract: A catalytic gas treatment apparatus in which a unitary catalytic element, having gas flow paths therethrough, is positioned within a surrounding casing. At least one, and preferably two, end flanges are provided and are positioned in a direction inwardly with respect to the casing and are adjacent the catalytic element end faces. Expansible and/or resilient retention members are positioned between the end flanges and the catalytic element end faces to expand as differences in thermal expansion rates result in differences in the distance between the end flanges and the catalytic element end faces. Consequently, untreated gas cannot pass between the catalytic element outer surface and the casing inner surface, and damage of the catalytic element end faces by the end flanges is lessened during vibration of the apparatus while operating at a high temperature.

Abstract: An exhaust gas manifold for an internal combustion engine in which there is provided an outer shell including an outer sleeve having a pair of end caps closing the ends thereof. An inner shell is carried within the outer shell and is formed by a plurality of slidably interfit inner sleeves which are supported in spaced relation to the outer sleeve on mounting members mounted on a second pair of end caps closing the ends of said inner shell and connected to said first pair of end caps. A plurality of inlet conduits and an outlet conduit are connected to said outer shell, and a plurality of inlet conduits and an outlet conduit are also connected to said inner shell with the conduits on said inner shell being carried in, and movable with respect to, the conduits on said outer shell.