Best coolant for our 60-70's Mopars?
The engine runs cooler. The coolant is hotter. Don't just skim and assume and guess; read and learn and understand.
This appears to be a variable issue from some quick reading. All I can find so far says that engines temps can (will?) indeed be higher with Evans Coolant. The reason is the the heat capacity of the Evans Coolant is lower than water or water plus standard A/F. The heat flow from the engine parts will be slower as the effective thermal resistance of the heat flow path through the coolant 'coupling' to the radiator will be higher due to the Evans not being able to hold as much heat. The thermostat will have to open a more to allow more coolant flow to compensate, and the t'stat will only do that if the coolant is hotter.
How close the engine's operation is to cooling system capacity throws a variable in all the above, and it all is countered to some degree by less boiling of the Evans coolant in the hot spots so some localized areas may be cooler. But on average, the engine will be hotter; is it 1 or 10 or 50 degrees? Depends ......
The following Evans statement supports all of this if you read it properly: "The operating temperature of the coolant may increase slightly, however the temperature inside the engine will be more consistent."
- "more consistent" ====> lower hot spot temps; less temp variations; etc.....
- "temperature of the coolant may increase slightly" ====> higher average system temps will result (It HAS to.....), and maybe less temp variations with heavy engine loading
And the idea that there will be no pressure in an Evans coolant filled system makes no sense. Evans coolant has a higher boiling point but the localized heat in and around hot pockets will exceed the Evans coolant boiling point so some vaporization and pressure will exist. And if the system is well filled and burped of air, then simple thermal expansion of the coolant will create some level of pressure. I can't find any statements by Evans that there will be no pressure in the cooling system with their product.
