Intake port structure for multi valve engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsKenichi Nonogawa, Mamoru Kaneko
Life of this patent
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Abstract
A cylinder head intake porting system for a three intake valve internal combustion engine wherein a staged induction system is employed and mid-range torque is improved by communicating separate intake passages with each other. Both carbureted and fuel injected embodiments are shown.
Claims25
An intake port arrangement for a cylinder head of an internal combustion engine, said cylinder head defining a combustion and at least three intake valve seats in said combustion chamber, a pair of separate inlet openings in an outer surface of said cylinder head, a first intake passage formed in said cylinder head extending from one of said inlet openings to a first of said valve seats, a second intake passage formed in said cylinder head extending from the other of said inlet openings to second and third valve seats, and means in said cylinder head for communicating said intake passages with each other adjacent said valve seats.
An intake port arrangement and charge forming system for a cylinder head of an internal combustion engine, said cylinder head defining a combustion chamber and at least three intake valve seats in said combustion chamber, a first intake passage formed in said cylinder head and terminating at first of said valve seats, a second intake passage formed in said cylinder head and terminating at said second and said third valve seats, a first fuel injector for spraying fuel into said first intake passage and a second fuel injector for spraying fuel into said second intake passage.
Dependencies are inferred from the claim text.