Abstract: A pair of intake valves 13 and a pair of exhaust valves 14 are arranged in a cylinder head 10, and a fuel injection nozzle 23 with a narrow diameter is mounted in a narrow space 401 between them. A fuel supply port 234 is provided near to the nozzle's fuel injection orifice 232, and with the nozzle 23 mounted, the nozzle's fuel supply port 234 is positioned within the narrow space 401. A fuel supply pipe 26, connected to the fuel supply port 234, has a first part portion 261 extending between valve lifter casings 11 and 12, another portion 262 leading from the vicinity of a cylinder head 10 to the camshafts 20 and 21, a curved portion 263 extending over an exhaust-side camshaft 21, and another portion 264 supported by a grommet 27 on the cylinder head 10.

Abstract: A seal construction for a heat control valve in a system for heating a fuel-air mixture in the intake manifold of an internal combustion engine by transfer of heat from exhaust gas flowing through a heating chamber defined in a portion of an exhaust manifold. The heating chamber is defined by a top wall, a bottom wall and two pairs of opposite sidewalls and the top wall is situated between the intake and exhaust manifolds. The heat control valve is made of a flat plate and fixed to a valve shaft rotatably supported by a pair of sidewalls across the heating chamber to swing therein. The side edges and the bottom edge of the heat control valve is brought into overlapping contact with the shoulders around concavities formed on the pair of sidewalls and the bottom wall of the heating chamber to stop swinging of the heat control valve over its fully closed position.