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Evans Waterless Coolants

What is a Waterless Coolant?

Evans Waterless Coolants are the ONLY 100% waterless automotive engine coolants available on the market. All Evans Waterless Coolants are a chemical blend that results in more efficient cooling due to a higher boiling point. The increased boiling point of the coolant eliminates the occurrence of boil over, cavitation, and detonation. evans logoNot only do our coolants not boil over, they do not freeze. At extreme cold temperatures the coolants contract and become extremely thick, not becoming solid and expanding like antifreeze containing water. Because Evans Waterless Coolants do not contain water, electrolysis and corrosion are also eliminated.

Converting to our coolant technology requires the entire cooling system to be drained (radiator, engine block and heater core) and refilled 100% with either our Heavy Duty or High Performance Coolants. No need to add anything. Evans Waterless Coolants will last the life of the engine and once converted, will never have to be replaced (this assumes that the cooling system is not contaminated with water).

Evans SA now has coolants to suit any liquid cooled engine from heavy duty, light aircraft, petrol vehicles and more. Also available is a flush fluid to ensure that all the previous coolant is flushed from the cooling system being converted.

Evans vs Water-Based Coolants

Like all competition engine builders, Jack Evans spent years working to find a way to run race cars faster without damaging levels of detonation, pre-ignition knock, and internal engine damage. His conclusion was that water in the cooling system was the cause of existing problems and a substitute coolant needed to be developed to allow engine development to move forward.

Through rigorous testing on dynamometers, at race tracks and in climate controlled OEM laboratory environments, Evans developed and quantitatively proved a new cooling technology by eliminating the use of water. The new coolants, Evans Waterless Coolants have an efficiency that is considerably superior to conventional coolants and has a boiling/vaporization point considerably higher than conventional water-based coolants. The end result is greater thermal efficiency and fuel mileage while at the same time reducing detonation, pre-ignition emissions and wear. Better yet, Evans Coolants are essentially non-toxic, non-corrosive, and operates with virtually no pressure.

Race engines have the capacity of operating at much higher efficiencies and power production levels than used at today’s limits, but there has been no practical way to accomplish this without causing localized coolant boiling and the resultant destructive detonation. When this happens, the coolant loses it’s ability to absorb heat from that particular area of the combustion chamber, developing high temperature spikes. The result is detonation or component structural metal failure.

Nucleate Boiling

Nucleate boiling

Nucleate boiling is the boiling that takes place when liquid coolant comes in direct contact with the hot metal of the engine block or cylinder heads which has reached or exceeded the boiling point of the coolant.

Under these conditions, the liquid turns to a vapor as it boils at the hot metal surface, and will then finally break away to be replaced by additional liquid coolant. Very large amounts of heat are absorbed into this layer of liquid coolant from the metal surfaces of the engine, yet those surface temperatures in a controlled nucleate condition never rise much beyond the boiling point of the coolant, and thermal control is maintained. Nucleate boiling is reduced or eliminated when the coolant itself becomes continuously displaced from the metal surface by a layer of vapor called a “film blanketing” (surface) layer. When blanketing occurs, the metal surface becomes insulated from the surrounding liquid coolant, and an ever – increasing localized high temperature spike develops. In the example to the left, the loss of Nucleate Boiling is demonstrated at location (A), and is a common problem with conventional water based coolants.

The loss of Nucleate Boiling causes a vapor blanket to be formed as the metal temperature exceeds the thermal capacity of a water-based coolant. A hot spot develops because the vapor blanket keeps the coolant from contacting the hot spot and increased detonation results. The very high surface tension of the water-generated steam promotes the formation of the vapor blanket and eventually destructive levels of pre-ignition (“knock”) occur. Sustained Nucleate Boiling reveals continuous heat transfer through the uninterrupted liquid-to-metal contact of the coolant.

(B) Demonstrates high engine load sustained “Nucleate Boiling”, free of surface vapor blanketing, attainable only with Evans Coolants.

Evans Waterless Coolants Maintain Nucleate Boiling Conditions

Testing history and experience tell us that conventional coolant systems always experience a loss of nucleate boiling which then originates and increases the condition of surface film vapor blanketing whenever an engine is in a high load or temperature operation. It is no surprise that auto makers as well as after market manufacturers have been combating this problem with multitudes of accessories, additives and applying performance limitations on engine design. By contrast, Evans’ cooling technology has eliminated the problem.

Why No Water?  Because anything else with a low boiling point in the system, 
such as water, causes the loss of nucleate boiling. 
In fact, water is a contaminant to the proper working of the new system and 
is eliminated by the Evans Technology which continuously moves it out of the 
cooling system.