eclou

One added bonus of using 90+% distilled water over a 50/50 mix is less drag on the waterpump. You can theoretically extend the life of the wp bearings and decrease parasitic drag with the lower viscosity of the dw vs coolant.

Danno

I haven't looked closely into how they deionize water... But due to it's polar nature, water should always be composed of H+ and H30- ions. You can't keep H20 water from disassociating into those ions. That's why water is one of the most common solvents.

M758

Don't run 100% water even in race cars. Coolant also acts as lubricant. The waterpump really needs this. I ran straight Distilled water in my race car for little while. Then I noiced some noise from the waterpump. Then i realized I FORGOT the water wetter. I added it in and noise was gone.

Most racing orgs discourage or prohibit the use of most coolants in race cars. This is where the water wetter is so important.

For street cars a 25% to 50% coolant to water ratio is about right. Closer to 25 for warm climates and 50 for colder ones.


Ohh and a little tap water or bottlewater will not hurt the car. If you need to add water and that is all there is it fine. It is only when you use that stuff over a long time does it start to build up.

facboy

w00t thanks guys! good old rennlist, always reliable. now, where's my membership...

Ben Z.

Danno- I think you mean H+ (or H30+) and OH- ions. Normal (neutral) concentrations of these ions are only about 1 part per billion, and I don't believe that is the reason for water's sovency (is that a word?).

I think that the pH and concentration of various dissolved species (oxygen, salts, etc.) in water determines the corrosiveness.