Abstract: The present invention features an automotive catalytic converter accessory device for improving the converter's efficiency and operational life. The accessory device has a housing disposed in the manifold exhaust pipe, upstream of the catalytic converter. The housing contains a hollow conduit that conveys the exhaust gases of the manifold to the entrance or interface of the catalytic converter. The conduit has a diffuser portion having a baffle plate disposed at the downstream end thereof, just before the converter inlet. The flow is divided into a bifurcated stream of gases that passes through the baffle plate. The outer stream of exhaust gas is caused to swirl as it passes through slots disposed at the end of the conduit ahead of the baffle plate. The major portion of the exhaust stream is caused to pass through a large central aperture in the baffle plate, along with the outer, swirling stream.

Abstract: The present invention features an automotive catalytic converter accessory device for improving its efficiency and operational life. The accessory device comprises a housing disposed in the manifold exhaust pipe, upstream of the catalytic converter. The housing contains a hollow conduit that conveys the exhaust gases of the manifold to the entrance or interface of the catalytic converter. The conduit comprises a plurality of injection orifices or a continuous annular orifice disposed about the periphery thereof. The orifices introduce air into the conduit passage. The air enters the conduit at spaced-apart, tangential angles with respect to the axis of longitudinal flow of the automotive exhaust gases. This causes a dynamic mixing of both air and exhaust gas, wherein both fluids begin to mix and swirl with respect to the flow axis. The swirling mixture then enters the catalytic converter, where by reason of its centrifugal action, the mixture is caused to expand into the wider converter cavity.