Intake system for multiple intake valve type engines
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorTakumori Yoshida
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Abstract
Several embodiments of induction systems for internal combustion engines that improve maximum power and also provide good running at low and medium speeds with a good torque curve throughout the engine speed range. Each embodiment includes a pair of intake passages that serve each chamber of the engine through a respective pair of intake valves. The intake passages are each tuned to serve a different running condition of the engine.
Claims20
In an induction system for a chamber of an internal combustion engine of the type having a pair of substantially equal area intake ports serving said chamber and separate intake passages each independently serving a respective one of said intake ports, the improvement comprising each of said intake passages having its effective length and effectional cross sectional area tuned to improve induction efficiency for a different running condition of the engine than the other, the tuning of each of said intake passages being accomplished by means that creates a condition in said chamber that will not adversely effect the induction into said chamber from the other intake passage.
An induction system for a chamber of an internal combustion engine of the type having a pair of intake ports serving said chamber and separate intake passages each independently serving a respective one of said intake ports, the improvement comprising each of said intake passages being tuned to improve induction efficiency for a different running condition from the other, said tuning of said intake passages being achieved by providing different effective lengths therefor, the tuning of each of said intake passages being accomplished by means that creates a condition in said chamber that will not adversely effect the induction into said chamber from the other intake passage.
Dependencies are inferred from the claim text.