CPC F02B 19/1023 (2013.01) [F02B 19/108 (2013.01)] | 15 Claims |
1. An engine comprising:
a main combustion chamber including a cylinder block, a cylinder head, and a piston;
a pre-chamber having a plurality of injection holes that open into the main combustion chamber; and
a spark plug that ignites an air-fuel mixture in the pre-chamber,
wherein a compression ratio ε of the main combustion chamber is not less than 14 and not more than 24,
a volume V of the pre-chamber is not less than 0.12 cm3 and not more than 0.328 cm3,
an index V·ε that is a product between the volume V of the pre-chamber and the compression ratio ε is not less than 1.03 cm3 and not more than 5.92 cm3, and
a ratio St/V of a total cross-sectional area St of the plurality of injection holes to the volume V of the pre-chamber is not less than 0.0078 mm−1 and not more than 0.0145 mm−1.
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