A cylinder structure satisfies the following conditions: 12% ¤ d/a ¤ 27%, where d is a distance between a cylinder inner surface 12a and an exhaust valve member 20b, and a is a diameter of the exhaust valve member; 40% ¤ c/b ¤ 50%, where c is a length ...

A valve-driving system, which is applied to an internal combustion engine having a plurality of cylinders, for driving an intake or exhaust valve (4,5) provided in each cylinder, comprising: a plurality of valve-driving apparatuses (11A,11B), each of which...

The injector (40) is so designed that part of the injected fuel impacts the valve disk (24) when the inlet valve (20) is open. The injector uses two additional ports so that the fuel spray (142) leaving these ports is directed onto the valve disk (24) as s...

The engine has at least one inlet valve unit constructed with such heat dissipation measures that a range of the load-RPM mapping, with surface temperatures in the region of the inlet valve's belling (68) below 180 degrees, is increased with reference to t...