ROTARY-TYPE THROTTLING DEVICE FOR INTERNAL COMBUSTION ENGINE
Aug 28, 2017 - HONDA MOTOR CO., LTD.
A rotary-type throttling device for an internal combustion engine includes an upstream auxiliary intake passageway formed in a throttle body and having an inlet port held in fluid communication with the atmosphere, and a downstream auxiliary intake passageway formed in a cylindrical valve body of a rotary valve and having an outlet port open at a downstream outer circumferential surface of the cylindrical valve body. The upstream auxiliary intake passageway and the downstream auxiliary intake passageway have a body-side joint fluid communication port and a valve-side joint fluid communication port formed in respective sliding surfaces of the throttle body and the cylindrical valve body and designed to overlap each other to keep the upstream and downstream auxiliary intake passageways and in fluid communication with each other. When the rotary valve is open, a main intake air stream passing through an intake passageway in the rotary valve flows smoothly for enhanced intake performance without being disturbed by an auxiliary intake air stream flowing out of the outlet port of an auxiliary intake passage.
I'm also looking for the article where the engineer discusses how much of a mess the first VLIM system was (he specifically calls it overcomplicated, and he wasnt sure it would work), he also says that it was important to learn that they needed to close the VLIM at times during the cycle. That is what lead to my starting this thread, and I will continue to look for the other article. Something tells me its near the end of the pre-season testing thread.