![]() ![]() This promotes galvanic corrosion where metals of high nobility sacrifice themselves to metals of lower nobility – this is often manifested by pitting.Ĭorrosion inhibitor formulations have changed many times over the years, but not always for the better. Water also acts as an electrolyte if dissolved solids, such as hardness salts (lime scale) etc., are present. This cycle leads to a perpetual cycle of corrosion, which is accentuated in classic vehicles with no expansion chamber. Water when heated drives off a significant proportion of dissolved oxygen, but as it cools reabsorbs fresh oxygen. Boil-Over when running and After-Boil when the engine is stoppedĬaterpiller state that “Over-heating is the most common cause of engine down-time and responsible for >50% of catastrophic engine failures”.Īlthough water is cheap and readily available, it is also the root cause of corrosion within engine cooling systems.Cavitation caused by vapour escaping – due to pressure drops occurring within the cooling pump.Erosion caused by pitting around the liner, cylinder head and coolant pump.Reduced combustion efficiency and detonation issues in fuel injected engines.Pre-ignition (engine knock) in carburetted engines. ![]()
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