PURPOSE: To equalize the air-fuel ratio of a mixture accelerating the rising up combustion as well as to improve the high speed output performance reducing fuel consumption by a method wherein a swirl guide is protruded beyond the ceiling of a combustion chamber so that the swirling guide may be inserted between a suction valve port and an exhaust valve port facing to each other.
CONSTITUTION: When a suction stroke is started, the first suction valve 181 is opened firstly, therefore the mixture flowing from the first suction valve port 91 to a combustion chamber 6 is led by the first branch port 131 directing to the second suction valve port 92 side and a steep first guide surface 8a of a swirl guide 8 to produce swirl and when the mixture reaches a gentle slope second guide surface 8b, the swirling direction of the mixture is deflected downward of the combustion chamber 6 led by the guide surface 8b to spiral. Next when the second suction valve 182 is opened, the mixture flowing from the second suction valve port 92 to the combustion chamber 6 is led by the second branch port 132 directing to an ignition plug 12 side to produce swirl and the air-fuel ratio of the other mixture in the combustion chamber 6 is equalized by intensifying the swirl while flowing together with the mixture preliminarily flowing from the first suction valve port 91. Through these procedures, the fuel consumption may be reduced improving the output performance.
NISHIKAWA MASAYASU
MARUTANI TAKESHI
| JPS5644418A | 1981-04-23 | |||
| JPS5548104U | 1980-03-29 |