Patent ID: 8640674

Claim:
A bi-fuel engine for a vehicle comprising an intake manifold that includes a plurality of intake runners, which are connected to one side of an engine main body of the engine at intervals with their downstream ends communicating with respective intake ports within the engine main body, and a surge tank, to which upstream ends of the plurality of intake runners are connected at intervals; an air cleaner communicating with said surge tank; a liquid fuel injection unit for supplying liquid fuel to said engine main body; a plurality of gaseous fuel hoses, which have one ends connected to said intake runners at positions near their downstream ends; a plurality of gaseous fuel injection valves, to which the other ends of said gaseous fuel hoses are connected; and a gaseous fuel delivery pipe, to which the plurality of gaseous fuel injection valves are connected, wherein said surge tank is placed above said engine main body; said intake runners include curved portions, respectively, which are placed on one side of the engine main body, and sloped portions extending from said surge tank to said curved portions; said air cleaner is placed above said sloped portions; said liquid fuel injection unit is placed in a space between said engine main body and said intake runners; said gaseous fuel delivery pipe is placed in a gap between said surge tank and said air cleaner; and said gaseous fuel injection valves are held by a bracket on the one side of the engine main body where said intake manifold is placed in a way that the gaseous fuel injection valves are placed under said air cleaner, each of the gaseous fuel injection valves being placed in a space between the adjacent two of said sloped portions.