Evans Waterless Coolant is perfectly suited for the demands of any hard-working engine. NPG+ is a blend of non-aqueous liquid ingredients, and retains all the benefits of the Original Evans NPGTM Waterless Coolant with some substantial improvements. Thermal conductivity of NPG+ compared to NPG has been improved by about 32% and viscosity reduced by about 65%. NPG+ is a “pour-in” coolant, not requiring changes to cooling system components, making it easy to convert from the conventional antifreeze and water mixes to Evans NPG+ Waterless Coolant.
NPG+ Waterless Coolant virtually eliminates overheating in gasoline and diesel engines. The waterless coolant allows engines to tolerate higher temperatures, without boiling over. Unlike conventional coolant 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 NPG+ are free from electrolysis, and is safe for use with all metals and totally non-corrosive to most.
Extreme hot and cold environments are no longer a concern with Evans NPG+. NPG+ is used as a pure coolant – no water added. The non-aqueous solution boils at 375 degrees F. NPG+ also out performs conventional coolant in freezing weather. A 50/50 mix of conventional antifreeze and water freezes around -40 degrees F. Pure NPG+ - no water – 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 no matter where or how hard they are driven.
An engine utilizing Evans NPG+ Waterless Coolant is able to control the temperature of the coolant significantly below its high boiling point (375 degrees). 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 an Evans Waterless Cooling System any locally generated vapor is immediately condensed back to liquid coolant, avoiding the development of an insulating layer of vapor. (continued below):
NPG+ 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 water vapor is about zero. Engines running with NPG+ can be operated at higher coolant temperatures while control of metal temperatures is maintained. This fact permits higher fan control temperatures and less fuel robbing parasitic drag.
NPG+ is ideally suited for controlling the extra heat created from EGR coolers, used to control emissions, in diesel engines. Conventional cooling systems have difficulty controlling the extra heat from the EGR coolers. NPG+ can successfully transfer the extra heat without requiring larger radiators.
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 F. Raising the coolant’s boiling point does not solve the problem occurring inside the engine’s water-jacket.
Inside the water-jacket, heat-stressed critical metal surfaces exceeds the thermal capacity of water-based coolants. These coolants boil, forming a vapor barrier at the metal’s surface. 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 when it returns 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. NPG+ 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 more effective heat transfer. Unique only to Evans Coolants, any vaporized NPG+ 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 eliminated from the cooling system most noncomputer regulated engines can operate at higher temperatures. Operating engines at higher temperatures increases their efficiency. NPG+ permits most engines to operate at higher temperatures without requiring any other system changes often allow an increase in power output and fuel efficiency.
NPG+ coolant is in use by truck fleets and owner/operators. In diesel engines, a 1% to 3% increase in horsepower may be seen for every 10 degrees F temperature rise. When employing about a 10 degree F temperature rise a 2% to 5% improvement in fuel mileage can often be seen.
NPG+ and the Original Evans NPG are virtually “lifetime” coolants. The additives in NPG+ are stable and remain in the solution for the life of the coolant (at least 500,000 miles) and no SCAs (Supplementary Coolant Additives) are needed. Conventional coolants must be flushed and changed at regular intervals to eliminate contaminants and renew effectiveness. NPG+ has almost no electrical conductivity so damage to metal, hoses, and gaskets by electrolysis is avoided. Because Evans NPG+ contains no water, corrosion, pump and cylinder liner cavitation are virtually eliminated creating major maintenance savings on both gasoline and diesel engines. The limit of Evans NPG+ Coolant has yet to be discovered.
Benefits of NPG+ For Your Engine
Street Rod, Classic Cars and Daily Drivers benefit from the virtually lifetime formula of the NPG+. The lifetime formula eliminates the need for seasonal coolant changes and draining for storage. Boil over while cruising and in hot weather is eliminated. These engines also benefit from a system without corrosion and running without detonation.
Racing and High-Performance engines are able to achieve better engine metal temperature control with NPG+. This eliminates detonation. NPG+ allows the driver to finish the race. DNFs from cooling related problems are not a concern when racing with NPG+.
Motorcycles running NPG+ do not boil over. The cause of corrosion is eliminated. NPG+ has no silicates. No more concern over the coolant’s capability with engine metal. NPG+ is compatible with aluminum and magnesium parts.
All racing applications need to know the rules of the track or race series concerning coolants. NPG+ cannot be used if there is a no antifreeze/ethylene glycol rule for that specific track or series. NPG (without the +) can be used in most cases where there is such a rule.
Diesel engines benefit from the elimination of the cause of scale, corrosion and cylinder linear cavitation. NPG+ increases the life of the engine. They can run without SCAs and reduce down time from coolant changes and filter maintenance. NPG+ is also EGR ready to meet emission requirements.
Why Evans Uses and Recommends Aluminum Radiators
Traditionally copper brass radiators have 4 rows of ½” or smaller tubes. This configuration limits the amount of fin to tube contact. It is the fin-tube contact which cools your vehicle. Aluminum radiators use larger tubes of at least 1” in diameter creating higher flow and greater fin-tube contact. Greater fin-tube contact and increased flow ability allows the radiator to transfer heat more quickly to cool your vehicle. Along with increased heat transfer characteristics aluminum radiators can be up to 60% lighter than a comparable copper brass radiator.
The Right Radiator
Determining what size radiator is right for the engine is key to an effective cooling system. Evans uses some general guidelines for minimum recommendations in systems running NPG+. If an engine produces less than 400 HP than a radiator with 2 rows of 1” tubes is sufficient. Engines making between 400HP and 600HP are recommended to have a radiator with 2 rows of 1.25” tubes. For engines producing more than 600HP or are equipped with a blower Evans recommends a radiator with 2 rows of 1.5” tubes. These guides give an idea of whether NPG+ is right for the engine or if the efficiency of separate components of the system need to be considered.