| 摘要 |
PURPOSE:To accelerate burnt gas emission control at the time of engine high load, by installing a venturi part in and around a combustion chamber of an exhaust passage, and opening a secondary air passage which leads the atmosphere into this venturi part. CONSTITUTION:A venturi member 12 is installed in a spot proximate to a combustion chamber 5 of an exhaust passage 7, and a venturi part 122 is formed in this member 12. And, a secondary air passage 14, leading the atmosphere into this venturi part 122, is opened thereto. With this constitution, even when displacement is much and exhaust pipe internal pressure is high as in time of high load, a large quantity of the atmosphere is taken in, whereby the air quantity required for exhaust emission control is securable.
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