Abstract

a) of adjacent combustion chambers are joined into a common exhaust channel (P2,P4) that communicates with an exhaust header (20) of the engine through valve means (V1,V2) that open during the high load mode of operation of said engine and close during a partial load mode of operation.

IPC Classes  ?

• F01L 7/14 - Multiple-valve arrangements
• F02M 26/01 - Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
• F01L 1/047 - Camshafts
• F01L 3/00 - Lift valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing facesParts or accessories thereof

Abstract

A combustion engine comprises combustion chambers (1-4) with reciprocating pistons (5), intake ports (6) and exhaust ports (7). Overflow ports (1 1,12) are provided between adjacent combustion chambers to provide an overflow channel ( 15,16) that closes during a high load mode of operation of said engine and opens during a partial load mode of operation. The overflow ports (1 1,12) straddle a path of shortest distance between adjacent combustion chambers and said overflow channel (15) extends at least substantially along said path of shortest distance. In a further aspect of the invention, exhaust ports (lb+2a, 3b+4a) of adjacent combustion chambers are joined into a common exhaust channel (P2,P4) that communicates with an exhaust header (20) of the engine through valve means ( V1,V2) that open during the high load mode of operation of said engine and close during a partial load mode of operation.

IPC Classes  ?

• F02B 41/06 - Engines with prolonged expansion in compound cylinders