Patent ID: 6155228
Filing Date: 2000-12-05
Classification: F02B,F02F,Y02T

Abstract:
In a four-stroke internal combustion engine having a cylinder block including at least two parallel, in-line cylinders, the combination comprising;a cylinder head (1) includingtwo intake valves per cylinder and two exhaust valves (26, 27) per cylinder, said intake valves and said exhaust valves, respectively, lying on opposite longitudinal sides of said engine relative to the crankshaft axis of said engine,an intake duct (9) including a main duct (10) branching into a pair of swirl ducts (11, 12) and branching into a pair of charge ducts (13, 14), a first of said swirl ducts and a first of said charge ducts leading to said intake valves, respectively, of one of said cylinders and a second of said swirl ducts and a second of said charge ducts leading to said intake valves, respectively, of the other of said cylinders andexhaust ducts (29, 30) connected to said exhaust valves (26,27) and opening directly into a flange surface (5) on said cylinder head (1) at one engine longitudinal side (6), said one engine longitudinal side (6) being the longitudinal side of said engine closest to said exhaust valves (26, 27),said main duct (10) being geodetically disposed above said swirl and charge ducts and said main duct (10) opening on one of said opposite longitudinal sides of said engine,said swirl ducts (11, 12) and said charge ducts (13, 14) lying on the engine longitudinal side opposite said engine longitudinal side (6) closest to said exhaust valves (26, 27).