Evans Waterless Coolant Technology

Evans NPG+ Waterless Coolant is perfectly suited for the demands of any hard-working engine. NPG+ is a “pour-in” coolant, making it easy to convert from conventional antifreeze and water mixes to Evans NPG+ Waterless Coolant. No cooling system component modifications are required for a successful conversion.

Evans NPG+ Lifetime Coolant

NPG+ Waterless Coolant virtually eliminates overheating in gasoline and light duty diesel engines. The waterless coolant allows engines to tolerate higher temperatures, without boiling over. Unlike conventional coolants, NPG+ has the ability to run at low or no pressure. This reduces the stress on the hoses, gaskets, and other system components lowering the maintenance costs on the cooling system. Because there is no water in the system, engines operating with Evans waterless coolant are free from electrolysis. Evans coolants are safe for use with all metals and totally non-corrosive to most.

Extreme hot and cold environments are not a concern with Evans Waterless Coolants. Evans is used as a pure coolant – no water is added. The waterless solution boils at 375 to 400 degrees F. Evans NPG+ also outperforms conventional coolant in freezing weather. A 50/50 mix of conventional antifreeze and water freezes around -40 degrees F. Pure Evans NPG+ remains liquid until -40 degrees F, when it contracts slightly and turns into a viscous slurry. It will not freeze solid and expand. Engines will run well not matter where or how hard they are used.

An engine utilizing Evans Waterless Coolant is able to control the temperature of the coolant significantly below its high boiling point (375 to 400 degrees F). This is a sharp contrast to conventional water based cooling systems that operate near the boiling point of the coolant. In conventional systems, locally generated coolant vapor often will not condense back to liquid, forming an insulating barrier between the coolant jacket metal and the liquid coolant, causing hot spots to develop. In and Evans Waterless Cooling System, any locally generated vapor is immediately condensed back to liquid coolant avoiding the development of an insulating layer of vapor.

Evans Waterless Coolant works well with liquid-to-liquid oil coolers and radiators. It is important to remember that although the thermal conductivity of water is great, the conductivity of the water vapor is about zero. Engines running with Evans can be operated at a higher coolant temperature while maintaining control of the metal temperature. This fact permits higher fan control temperatures and less fuel robbing parasitic drag.

Engines run more efficiently at higher temperatures. Conventional systems limit how hot a gasoline or diesel engine can run before serious damage occurs. Water based coolants vaporize around 225 degrees F at sea level. These systems are pressurized to raise the boiling point to around 250 degrees F. Raising the coolant boiling point does not solve the problem occurring inside the engine water jacket.

Inside the water jacket, heat stressed critical metal surfaces exceed the thermal capacity of water-based coolants. These coolants boil, forming a vapor barrier at the metal surfaces. This vapor barrier acts as an insulator and prevents efficient heat transfer from the metal to the coolant, causing localized overheating and vaporization of coolant. Eventually, when released into the coolant, this super-heated vaporized coolant does not condense upon return to the radiator. It then remains a gaseous barrier preventing heat transfer in the radiator. The result with water-based coolants is continual loss of cooling efficiency as the vapor circulates through the hot engine and radiator. Evans Waterless Coolant technology bathes the entire cooling jacket and significantly improves coolant surface effectiveness. Heat transfers more efficiently from the metal to the vapor-free liquid coolant and is carried off to the radiator for better heat transfer. Unique only to Evans Coolants, any vaporized coolant immediately condenses back to liquid while still in the engine allowing the coolant to continually remain vapor-free and absorb damaging heat on its way to the radiator.

When trapped heat is generated from the cooling system most non-computer regulated engines can operate at higher temperatures. Operating engines at higher temperatures increases their efficiency. Evans Waterless Coolant permits most engines to operate at higher temperatures without requiring any other system changes, which often allows an increase in power output and fuel efficiency.

Evans NPG+ and HDTC are virtually “lifetime” coolants. The additives in these two products are stable, remain in solution, and protect engines for the life of the coolant (at least 500,000 miles for NPG+ and 1,000,000 miles for HDTC). Conventional coolants must be flushed and changed at regular intervals to eliminate contaminants and renew effectiveness. Evans coolants have almost no electrical conductivity so damage to metal, hoses, and gaskets by electrolysis is avoided. Because Evans coolants do not contain water, major maintenance savings are created for engines by virtually eliminating corrosion, pump and cylinder liner cavitation. The limit of Evans Waterless Coolant products has yet to be discovered.

Evans NPGR
Evans NPGR is specifically formulated to handle the extreme conditions of racing and high performance automotive, marine, and motorcycle applications. NPGR exhibits superior coolant flow, as it is less viscous than the popular NPG+. The improvement in thermal-conductivity increases the ability of NPGR to transfer extreme heat away from the engine coolant jacket. This provides superior engine metal temperature control. High coolant temperature related detonation is also eliminated with NPGR as it stays in a more liquid state instead of converting to vapor and creating hot spots within the engine cooling jacket. Remaining in a more liquid state allows NPGR to remove additional heat from the cylinder heads when compared to other coolants. The heat is then transferred away from the engine providing continuous control of cylinder head metal temperatures.

The reduced viscosity of NPGR makes it more compatible with small tube copper-brass radiators while providing the superior cooling of Evans Waterless Coolants. (NPG+ is ONLY recommended for larger tube aluminum radiators). All metals, including magnesium, are safe to use with NPGR. Although NPGR is safe for all metals and contains no water, an annual coolant change is suggested for racing engines. NPGR has a lifetime additive package and does not need to be changed seasonally for street driven vehicles.

NPGR does not freeze or boil-over. However, it is not a cold weather operating coolant. In cold temperatures (down to -10 degrees F), NPGR will not freeze and expand like conventional water-based coolants. Instead it contracts until it is too thick to blow through the cooling system. It does not become a solid and does not pose the threat of cracking the engine block when stored in extreme cold temperatures. With a boiling point of 400 degrees F at 7 psi, NPGR will never boil-over because it immediately condenses back to a liquid within the cylinder head coolant jacket, maintaining liquid contact on all metal surfaces at all times.

As with NPG+, NPGR is a stand alone pure coolant. NPGR requires all the existing antifreeze and water to be removed from the radiator, engine block and heater core. In small systems where there is no engine block drain, Evans PREP fluid can be used to remove the small amount of remaining water. PREP fluid is required for a successful motorcycle engine conversion. Once the cooling system is completely empty, simply fill with NPGR. Do not add anything else.

Confirming your Evans Coolant Installation
Professional Lubricant Supply, LLC is capable of testing the fresh Evans coolant after installation to confirm the absence of water. We do not charge for this service. Contact us to set an appointment!