Exhaust manifold for an internal combustion engine

An exhaust manifold for an internal combustion engine comprising inlet means for exhaust gas form an internal combustion engine, outlet means to an exhaust duct, a main chamber, an ante-chamber, a heat insulating partition wall disposed between and common to said main and ante-chambers, said chambers extending parallel to each other, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, said flow path defining means including a transfer opening for gas flow from the ante-chamber into the main chamber at one end of the main chamber, said main chamber having an outlet pipe at its other end, said ante-chamber having an irregular prismatic shape having a recessed lower part wherein said main chamber fits along said lower part of the ante-chamber opposite said inlet means, said ante-chamber having an upper surface which, together with said partition wall comprises a double wall with thin intermediate insulation, means in the main chamber for receiving catalytic reaction components disposed between the transfer opening and the outlet pipe, and means for introducing post combustion air into the gas flow path through said ante-chamber.

an exhaust manifold for an internal combustion engine comprising inlet means for exhaust gas from an internal combustion engine, outlet means to an exhaust duct, a main chamber and an ante-chamber disposed in an inner jacket, a heat insulating partition wall disposed in the inner jacket between said main and ante-chambers, said chambers extending parallel to each other, an outer jacket surrounding the inner jacket and comprising a body in which said inlet means is attached to the manifold, and a cover which engages the body, said body and cover being arranged to be joined along a plane which substantially bisects the cross-section of both the main and ante-chambers, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, said flow path defining means including a transfer opening for gas flow from the ante-chamber into the main chamber at one end of the main chamber, said main chamber having an outlet pipe at its other end, means in the main chamber for receiving catalytic reaction components disposed between the transfer opening and the outlet pipe, and means for introducing post combustion air into the gas flow path through said ante-chamber.

An exhaust manifold for an internal combustion engine, comprising inlet means for exhaust gas from an internal combustion engine, outlet means to an exhaust duct, an ante-chamber, a main chamber, a heat insulating partition wall disposed between and common to said main and ante-chambers, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, means in the main chamber for receiving catalytic reaction components, and means for introducing post combustion air into the gas flow path through said ante-chamber, said inlet means comprising tubes which open substantially into the lower part of the ante-chamber tangentially to the surface of the said partition wall.

An exhaust manifold for an internal combustion engine, comprising inlet means for exhaust gas from an internal chamber, a main chamber, a heat insulating partition wall disposed between and common to said main and ante-chambers, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, a central sleeve in the main chamber for receiving catalytic reaction components, and means for introducing post combustion air into the gas flow path through said ante-chamber, said main chamber comprising inlet and outlet casings engaged with the ends of said sleeve, and outlet means being in communication with said outlet casing.