Intake system for multiple valve type engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorHaruo Nakamura
Life of this patent
Estimating the term…
Abstract
An improved performance internal combustion engine having a pair of intake passages that supply the charge to a single chamber of the engine. A valving arrangement is provided so that the idle charge is supplied primarily through one of the intake passages and the full load charge is supplied through both passages. An interconnecting passage interconnects the passages with each other downstream of the throttle valves so that at least a portion of even the idle charge will be supplied through both passages to cool the intake valves associated with the passages and to ensure against the collection of deposits. In accordance with a feature of the invention, a pair of spark plugs are positioned in the chamber at its outer periphery on diametrically opposite sides of the cylinder.
Claims11
In an induction system for an internal combustion engine of the type having a pair of intake ports for providing a charge to a common chamber of the engine, separate intake passages each independently serving a respective one of said intake ports, throttle valve means in said intake passages for controlling the flow therethrough so that an idle charge is delivered to the chamber primarily through a first of said intake passages and wide open load charge requirements are supplied through both of said induction passages, the improvement comprising an interconnecting passage extending between said first intake passage and the second intake passage downstream of said throttle valve means for providing communication between said passages regardless of the position of said throttle valve means.
Dependencies are inferred from the claim text.