CPC F02B 19/1023 (2013.01) [F02B 19/108 (2013.01); F02B 19/1014 (2013.01)] | 20 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, and
an index St·ε that is a product between a total cross-sectional area St of the plurality of injection holes and the compression ratio ε is not less than 0.1496 cm2 and not more than 0.8449 cm2.
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