| 摘要 |
PROBLEM TO BE SOLVED: To prevent a fuel blow-by and to increase an engine output limit. SOLUTION: An injector 7 is provided at the exhaust port 6a side of a cylinder head 2, the central axis OJ of the injector is directed to a scavenge port 5a side, and the atomizing angleθf of the injector 7 is set in a narrow scope 10 to 40 deg.. Since the fuel injected from the injector 7 is the uppermost upstream of the scavenge flow, and it is developed around the scavenge port 5a at the longest part from the exhaust port 6a, not only a fuel blow-by can be prevented, but also the maximum premixing time can be secured.
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