Abstract: A four-stroke engine includes a cylinder head in which a combustion chamber, an intake port that communicates with the combustion chamber, and a housing hole that passes through the combustion chamber and through the intake port are provided, and a fuel injector that supplies a mist of fuel directly to the combustion chamber by jetting the mist of fuel toward the combustion chamber. The fuel injector includes at least a portion that is disposed at the intake port and at the housing hole.

Abstract: A four-stroke engine includes a cylinder head, a cylinder body connected to the cylinder head, and a fuel injection valve. The cylinder head defines a combustion chamber, an intake port that communicates with the combustion chamber, and an exhaust port that communicates with the combustion chamber. The fuel injection valve is held by the cylinder head on a side extending from the exhaust port to the cylinder body. The fuel injection valve is arranged so as to supply a fuel mist directly to the combustion chamber by jetting the fuel mist toward the combustion chamber.

Abstract: An outboard motor includes a left bank and a right bank. An exhaust port in each of the left bank and the right bank is arranged outward relative to a cylinder axis line in an outer motor width direction. A left exhaust pipe is arranged outward relative to a crankcase and the left bank in the outer motor width direction. A right exhaust pipe is arranged outward relative to the crankcase and the right bank in the outer motor width direction. A catalyst is located in each of the left and right exhaust pipes.

Abstract: An outboard motor includes a V-shaped 4-cycle engine including fuel injection devices that directly inject fuel into combustion chambers. The engine includes a left intake path including a left path extending from an intake port in a left bank in an obliquely rearward and rightward direction, and a right intake path including a right path extending from an intake port in a right bank in an obliquely rearward and leftward direction. The left fuel injection device is located to the right of a cylinder axis line in the left bank. The right fuel injection device is located to the left of a cylinder axis line in the right bank.

Abstract: A four-stroke engine includes a cylinder head, a cylinder body connected to the cylinder head, and a fuel injection valve. The cylinder head defines a combustion chamber, an intake port that communicates with the combustion chamber, and an exhaust port that communicates with the combustion chamber. The fuel injection valve is held by the cylinder head on a side extending from the exhaust port to the cylinder body. The fuel injection valve is arranged so as to supply a fuel mist directly to the combustion chamber by jetting the fuel mist toward the combustion chamber.

Abstract: A four-stroke engine includes a cylinder head in which a combustion chamber, an intake port that communicates with the combustion chamber, and a housing hole that passes through the combustion chamber and through the intake port are provided, and a fuel injector that supplies a mist of fuel directly to the combustion chamber by jetting the mist of fuel toward the combustion chamber. The fuel injector includes at least a portion that is disposed at the intake port and at the housing hole.

Abstract: A number of embodiments of internal combustion engines that embody a variable valve timing mechanism for varying the valve timing during engine operation. The variable valve timing mechanism includes at least one VVT device that is located at a position that is remote from the cam shaft and in each embodiment is mounted in the cylinder block.