Abstract: A head cover arrangement for a double overhead cam type engine, including a head cover for covering two cam shafts provided, in parallel with each other, on a cylinder head and a boundary member for bounding a hollow defined, between the cam shafts, by the head cover and the cylinder head so as to form a chamber for accommodating a plurality of spark plugs and a plurality of high-tension cords connected to the spark plugs, respectively. The boundary member includes an upper member for constituting a top wall of the chamber and a side member for constituting a side wall of the chamber and the side member is formed with a plurality of recesses for securing the high-tension cords, respectively such that the high-tension cords are drawn out of the chamber through the recesses, respectively.

Abstract: An intake system for an internal combustion engine comprises an intake manifold and a surge tank member connected together to form a plurality of long bowed first discrete intake passages each leading to one of the cylinders and a volume chamber disposed on the upstream ends of the first discrete intake passages. The intake manifold is further provided with a plurality of second discrete intake passages each of which branches off from one of the first discrete intake passages to extend on the inner side of the same and is shorter than the first discrete intake passages, and with a communicating passage for interconnecting the second discrete intake passages. A valve is provided in each second discrete intake passage to open and close the second discrete intake passage according to the operating condition of the engine. A part of the wall defining the communicating passage is formed by a plate member sandwiched between the intake manifold and the surge tank member.

Abstract: A cylinder head construction for a combustion engine, which comprises a wall structure defining a cylinder head lower surface adapted to contact a mating surface of a cylinder block, and having an inwardly recessed wall defining a combustion chamber, an exhaust port defining wall open at one end at said inwardly recessed wall and at the opposite end in a cylinder head side wall, and adapted to be selectively opened and closed by two separate exhaust valves, wherein a pair of exhaust ports, one for each exhaust valve, are defined at least adjacent the exhaust valves, respectively, a coolant passage defined between the wall structure and the exhaust port defining wall, and a wall member extending between the exhaust port defining wall and the wall structure for deflecting a coolant in the coolant passage so as to flow into a space between the exhaust ports.