An engine includes two or more banks, VVTL mechanisms provided for the respective banks for changing the operating characteristics of intake valves, and a control device that controls the VVTL mechanisms. The passage is limited at least on one side by a frame-shaped lateral portion having a slit. The lumen of an outer tube receives the gas infusion tube and the diffuser. Each of the light emitters is configured to emit light and each of the mounting assemblies engages one of the light emitters to mount each of the light emitting members to an associated one of the blades. 5 to 3 mm in diameter of circle equivalent formed on a plated peripheral surface of the cooling drum, adjacent to each other at rims of the dimples; and a film, containing oxides of at least one member selected from the group consisting of Ni\u2014W, Ni\u2014Co\u2014W, Cr, Ni\u2014Fe and Ni\u2014Al, is formed on the peripheral surface.