Exhaust gas recirculation pre-stratified charge

Claim 1

In an internal combustion engine having a combustion chamber, a carburetor for producing a fuel/air mixture, intake manifold and intake valve means for delivering a charge of said mixture to the combustion chamber, an ignition device for igniting the charge in the combustion chamber, and exhaust valve and exhaust manifold means for removing products of combustion from the combustion chamber; the improvement comprising: (a) a stratifying device including a conduit containing a plurality of holes; (b) said intake manifold having a portion thereof wherein flow therein is determined by whether said intake valve means is open or closed; (c) said stratifying device being positioned in said intake manifold portion controlled in flow by said intake valve means such that the gas passes directly from said conduit through said holes in a direction transverse to the axis of flow within said intake manifold portion towards a wall of said intake manifold; and (d) exhaust gas passage means connected between said exhaust manifold and said conduit, whereby when said intake valve is closed, exhaust gas enters said intake manifold through the holes of said stratifying device to produce a pocket of diluted exhaust gas in the intake manifold, and when the intake valve is open, the stratified charge delivered to the combustion chamber includes a layer of diluted exhaust gas.