A spark plug is disposed so that its discharge electrode portion is in {HEAD ~ the proximal area} of {TAIL ~ the fuel} from the fuel injection valve 
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A spark plug is disposed so that its discharge electrode portion is in { HEAD ~ the proximal area } of { TAIL ~ the fuel } from the fuel injection valve
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH