| 摘要 |
PURPOSE:To improve combustibility by providing an auxiliary air feed passage for communicating a port capable of forming a swirl with an air feed located downstream from a supercharger and a main an feed passage communicating with a straight port after opening a valve at the time of an increase in supercharging pressure. CONSTITUTION:An auxiliary air feed passage 3 for connecting an air feed passage 4 located downstream from a supercharger 10 to a swirl forming port bent for forming a swirl, a valve 17 for opening against a spring 17c at the time of an increase in supercharging pressure and a main air feed passage 2 communicating with a straight port are provided. At the time of low speed operation under low supercharging pressure, a high swirl is formed in a cylinder, and combustion is improved. When high pressure air is fed from the supercharger, the valve 17 is opened and a large quantity of air is fed from the main air feed passage 2.
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