EVANS COOLING SYSTEMS, INC. Evans Cooling Systems, Inc. introduces NPG-R, its newest addition to their innovative line of waterless Engine Coolants. NPG-R is specifically formulated to handle the extreme conditions of racing and high performance automotive, marine and motorcycle applications. Engines previously unable to be effectively cooled with water or conventional water-based antifreezes now have the option of the improved heat transfer formula of NPG-R.

NPG-R exhibits superior coolant flow, as it is less viscous than the popular NPG+. Its improvement in thermal-conductivity increases the ability of NPG-R 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 NPG-R as it stays in a more liquid state instead of converting to vapor and creating hot spots within the engine coolant jacket. Remaining in a more liquid state allows NPG-R 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 NPG-R makes it more compatible with small tube copper-brass radiators while providing the superior cooling of Evans Waterless Coolants. (NPG+ and NPG are only recommended for large tube aluminum radiators.) All metals, including Magnesium, are safe to use with NPG-R. Although NPG-R is safe for all metals and contains no water, an annual coolant change is suggested for racing vehicles. For maximum corrosion protection, high performance street driven vehicles running NPG-R should change coolant every other year.

NPG-R does not freeze or boil-over. In cold temperatures (down to -1OF°) NPG-R will not freeze and expand like conventional water-based antifreezes potentially cracking the engine block. In contrast NPG-R contracts into thick slurry - never becoming a solid. With a boiling point of 400°F at 7psi, NPG-R will never boil-over because it immediately condenses back to a liquid within the cylinder head coolant jacket, maintaining a liquid contact on all metal surfaces at all times.

As with NPG+ and NPG, NPG-R is a stand-alone coolant. Therefore, NPG-R requires all the existing antifreeze and water to be removed from the radiator, engine block and heater core. (Evans Prep Fluid is available for smaller capacity systems where the engine block cannot be fully drained) Once system is empty fill 100% with NPG-R. A free Test Strip is included with all purchases as a guide to a successful conversion. Technical assistance is available to assist in determining which Evans Waterless Coolant is right for your application.

Evans and Darton Sleeves Darton Sleeves Requires NPG+ or NPGR for use with its sleeve conversions
The Darton kit effectively converts the block to a wet sleeve configuration as used on diesel engines. One cannot expect the original cooling system to effectively cool an engine producing two or more times the power of the original engine, along with a modified cylinder arrangement. We require “Evans NPG+™ coolant” be used as well as Evans LS-1 reworked water pump utilizing a relocated thermostat. High output applications may also require a larger radiator and coolant fan. Evans coolant is recommended because of the potential for hot spots and cavitation around wet style sleeves. We realize that most engines built will produce well in access of the stock rated horsepower making cooling system enhancements a must.
The above taken from Darton Sleeves Technical papers. For more information on Darton, please visit http://www.darton-international.com