“One major difference between water-based coolants and Evans waterless coolants is that the bar can safely be raised without worrying about cooling system failure.” “Water-based coolants are pushed to their limits and the demands of an engine are forcing cooling technologies to raise the bar,” he notes. A waterless coolant, such as Evans, does not form vapor in an engine because of its high boiling point. Water loses most of its heat transfer abilities when it turns to vapor, creating stress within the cooling system. Waterless coolant According to Mike Tourville, director of marketing for Evans Cooling Systems, because of newer engine technologies, a coolant that can transfer heat under extreme environments without forming vapor – and hence pressure – or overheating is a preferable choice. “While of great importance, the inhibitor package may comprise only 3% to 5% of the total coolant composition,” Pellet says, adding that coolant also contains minor components such as scale inhibitors, anti-foams, dyes and sometimes bittering agents to reduce chances of accidental ingestion. Corrosion inhibitors must protect all cooling system components, which can include iron, steel, copper, brass and aluminum. The third component is comprised of a corrosion inhibitor package. “Glycol is not as efficient at heat transfer as water, so some cooling capability is sacrificed to gain freeze protection.” “When mixed with water, glycol can lower the coolant freeze point to -30˚ to -50˚ F with the greatest freeze point depression coming at about 60% glycol content,” Pellet explains. Most coolants today also offer freeze protection, which is provided by ethylene glycol. “Where heat transfer is limiting, even higher levels of water may be used.” Coolant makeup Because of the first and foremost coolant function – efficient heat transfer – almost all coolants contain 40% to 60% water, which is “the most effective heat transfer agent readily available for this number one job,” says Old World’s Pellet.
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