Patent ID: 7055315

Claim:
A heat exchanger for a multicylinder internal combustion engine having a plurality of cylinders and exhaust passages extending from respective cylinders, comprising: a first heat exchanger (H 2 to H 4 ) disposed inside each of said exhaust passages ( 33 ) extending from a corresponding combustion chamber ( 16 ) of the multicylinder internal combustion engine ( 1 ) toward an exhaust pipe ( 32 ) at a location downstream from an exhaust valve ( 25 ), and a second heat exchanger (H 1 ) disposed inside a section where at least two of the exhaust passages ( 33 ) extending from respective combustion chambers are combined such that said at least two exhaust passages communicate with said section and exhaust gases from the respective combustion chambers flow through said at least two exhaust passages, respectively, and then through said section, wherein at said section, the exhaust gases are combined into a non-pulsed flow free from exhaust interference.