Just had a look at the Evans site
I did wonder about this lot
Q. What is bad about water in a coolant?
- The boiling point of water is only 100°C.
- Because an engine operates very close to the boiling point of water,(within the engine block and cylinder head boiling actually occurs), thus causing pressure within the cooling system.
- The boiling point of water is the failure temperature of the cooling system.
- Water vapour (steam) has almost no thermal conductivity.
- Water is aggressive toward cooling system metals and promotes electrolysis between dissimilar metals within the cooling system.
- Water contains Oxygen which encourages corrosion in any cooling system.
1 That's at atmospheric pressure a cooling system is pressurised so the water will not boil at 100 degrees C many systems operate at around the 80-90 mark so plenty of extra cooling if required
From memory isn't it 120 degrees C at 1 bar above atmospheric pressure?
So if you cooling system has a 1 bar cap on the tank then it shouldn't boil until its 120 degrees
2 The system is designed to operate pressurised, if its boiling locally you must have an air lock ( Mazda Bongos are prone to this unless you get all the air out of the system)
3 How can it be?
4 If you have steam in the cooling system you have a problem
5 Thats why you use corrosion inhibitors and the components of the engine are chosen to work with these.
6 That's why we have inhibitors.
Now this stuff may be the best thing in the world but as yet I cant see the benefits if any are worth the down sides or additional cost