I.C. Engine intake air cleaner and silencer

摘要

The air cleaner intake duct 2 is provided with two regions 6 and 7 of holes 4 and 5 spaced from the open end of the duct at distances between 0.14 and 0.26 and 0.34 and 0.42 of the total length of the air intake duct 2, respectively. Each of the regions 6 and 7 comprises at least two holes 4 and 5. The total flow area of the holes 4 or 5 is between 0.02 and 0.04 times the mean duct cross-sectional area. The duct (2', Fig. 5) may be curved to follow the cleaner housing 1.