Cross-flow type internal combustion engine with a small sized exhaust gas recirculating system

A system comprising:

• an inline reciprocating internal combustion engine having a cylinder block and a cross flow type cylinder head disposed on top the cylinder block to define therebetween four aligned combustion chambers, said cylinder head having on one side and the other side portions with four intake ports and two siamesed exhaust ports, each of said two siamesed exhaust ports being disposed to unite two adjacent exhaust ports which respectively lead from two adjacent combustion chambers of said four combustion chambers, each of said combustion chambers having therein two spaced spark plugs;
• an intake manifold having four tubes united at upstream portions thereof respectively fluidly connected at the downstream portions thereof to said four intake ports of said cylinder head;
• an air-fuel mixture supply means positioned upstream of said intake manifold for supplying an air-fuel mixture into said intake manifold;
• a thermal reactor having two inlet tubes and an outlet tube, said two inlet tubes being respectively connected to said two siamesed exhaust ports so that exhaust gases from said combustion chambers are forced to pass through said thermal reactor for after-combustion thereof before being discharged into the atmosphere through said outlet tube;
• and
• exhaust gas recirculating means for recirculating a portion of the exhaust gases from the combustion chambers back into said combustion chambers through said intake manifold, said exhaust gas recirculating means comprising a through hole formed in said cylinder head to extend from one of said siamesed exhaust ports to the one side portion of said cylinder head, a conduit tube having one end open into an air-fuel mixture passage defined in said air-fuel mixture supply means and the other end fluidly connected to said through hole, and a gas flow controller disposed in said conduit tube to control the flow rate of the exhaust gases passing through the conduit tube into the air-fuel mixture passage in response to the degree of venturi vacuum created in said air-fuel mixture passage of said air-fuel mixture supply means.