Intake port structure for internal combustion engines

Details Intake port structure for internal combustion engines Intake port structure for internal combustion engines

F - Mech Eng,Light,Heat,Weapons

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F02F 1/24 (2006.01) F02B 31/00 (2006.01) F02F 1/42 (2006.01)

Patent

CA 1210656

ABSTRACT OF THE DISCLOSURE An intake port structure for an internal combustion engine having a two-barrel carburetor includes a primary intake passage defined in a cylinder head for supplying an air-fuel misture into a combustion chamber in a full range of loads, and a secondary intake passage defined in the cylinder head for sup- plying an air-fuel mixture into the combustion chamber under relatively high load conditions. The primary intake passage has a first outlet port opening into the secondary intake pas- sage immediately upstream of the valve face of an intake valve. The secondary intake passage has a second outlet port opening into the combustion chamber through the valve face. A wall pro- jects into the secondary intake passage adjacent to the second outlet port for deflecting an air-fuel mixture flowing from the secondary intake passage into the combustion chamber to form a swirl of air-fuel mixture in the combustion chamber. The air- fuel mixture flowing from the primary intake passage is guided along a side of the wall which faces upstream in the secondary intake passage, and is also guided by a groove extending from the first outlet port into the secondary intake passage. The side of the wall and the groove assist the air-fuel mixture flowing from the primary intake passage in forming a swirl of air- fuel mixture in the combustion chamber. - 16 -

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