Intake system for multi-cylinder engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsMasatoshi Hasegawa, Keiichi Sugiyama
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Abstract
Several embodiments of induction systems for internal combustion engines wherein each chamber of the engine is served by a relatively long low speed induction passage and a relatively short high speed induction passage. The arrangements of the passages is such that the change in length is achieved quite simply by positioning a throttle valve at the upstream end of the short induction passage and having both passages communicate with an air inlet device. Several embodiments of throttle valve arrangements are also disclosed wherein a single throttle valve can control the flow through two adjacent induction passages.
Claims14
An induction system for an internal combustion engine comprising a cylinder head defining at least in part a pair of adjacent variable volume chambers, a first pair of intake passages each serving a respective one of said chambers, a second pair of intake passages each serving a respective one of said chambers, an intake device defining a plenum chamber for serving said pairs first and second intake passages, and throttle valve means in said second intake passages for controlling the flow therethrough, said second intake passages being adjacent each other and separated by a wall, said throttle valve means being positioned contiguous to the point where said second intake passages interconnects with said plenum chamber for forming a relatively short effective length for said second intake passage, said wall terminating on the upstream side of said second intake passages from said throttle valve means for communicating said second intake passages with each other and with said plenum chamber immediately upstream of said throttle valve means said first intake passages being spaced from each other and having portions opening into said plenum chamber at a substantially greater distance into said plenum chamber for forming a relatively long effective length for said first intake passage.
An induction system for an internal combustion engine having a pair of adjacent variable volume chambers, a first pair of relatively long intake passages each serving a respective one of said chambers, a second pair of relatively short intake passages each serving a respective one of said chambers, said second pair of intake passages being positioned between the intake passages of said first pair, and said second pair of intake passages being formed by a generally cylindrical runner divided into said first and second intake passages by a diametrically extending wall having an interrupted portion and a single butterfly type throttle valve supported in said interrupted portion for controlling the flow through only both of said second pair of intake passages.
Dependencies are inferred from the claim text.