COOLING SYSTEM IN A LIQUID COOLED INTERNAL COMBUSTION ENGINE

摘要

A liquid circulation cooling system for a two-cylinder internal combustion engine with a cylinder head, a cylinder case and a crank case includes, a space for a thermostat provided in a water jacket of the cylinder head at a region between the two cylinders, the cylinder head having a by-pass port in a bottom surface of the cylinder head to communicate with the space, and a by-pass canal integrally formed in the cylinder case, said by-pass canal being connected with said by-pass port in the cylinder head and with a water pump attached to the engine; the disadvantage associated with a separately formed rubber hose bypass circuit are avoided.