Abstract: Disclosed is an internal combustion engine having a direct injection combustion chamber. The internal combustion engine includes a fuel injector mounted in a cylinder head at substantially a center of the combustion chamber; an intake port and an exhaust port formed in the cylinder head and which exit into the combustion chamber on opposite sides of the fuel injector; a first spark plug mounted in the cylinder head such that a firing tip thereof is positioned under where the intake port exits into the combustion chamber, the first spark plug operating to ignite a lean mixture of fuel and air supplied to the combustion chamber by the intake port and the fuel injector; a second spark plug mounted in the cylinder head on one side of the fuel injector, and which ignites a fuel-air mixture of a stoichiometric ratio fed into the combustion chamber by the injector and the intake port; and a piston head provided on a upper face of a piston.