| 摘要 |
PURPOSE:To prevent any undesirable influence on an engine having a double suction passage for improving engine performance in a partial load range, by allowing reflux of blow-bye gas through a high-load secondary suction passage only in said partial load range. CONSTITUTION:A separator 26 which separates mist of lubricating oil from blow-bye gas is disposed on a cylinder head cover 24, and connected to the second bleezer pipe 28, which is communicated with an air cleaner 20. The first bleezer pipe 30 is connected to a crankcase 22 while interposing a flow regulation valve such as a PCV valve 32 on the way, and is terminated at a reflux opening 34, which opens in the lower course from a secondary throttle valve 16 of a secondary suction passage 12. In a partial load range, blow-bye gas produced in the crankcase 22 is led in the first bleezer pipe 30 then passing through the PCV valve 32, flowing into the secondary suction passage 12 only, and then sucked into a combustion chamber 4 therefrom. |
