Antifreeze does an even better job because you can run it hotter for higher efficiency. It not freezing in winter is a big plus for those of us that live where real winter happens, but it sure is deadly slippery on the road or track in the event of a spill.
Deionized is not the same as distilled. I have several jugs of antifreeze concentrate in my garage and they all say to mix with soft or deionized water.
I always use premixed aluminum safe, silicate free coolant when I service the bike. The best way to assure optimum performance and longevity for my street only bike. I agree; day to day this provides the lowest potential for me to forget to swap it back before a freezing event. As I typically manage to ride every month of every year and span 100+F to ~26F, I have more important considerations when the opportunity arises.
Agreed.... Distilled isn't as electrically active as de-ionized. Distilled is at whatever mix of positively and negatively charged potentials there are in the molecules of impurities that remain. De-ionizing takes it another step and reduces that variation by the same process that water softener systems employ.
When water containing minerals in suspension passes over the resin beads in the softener tank, which are uniformly at the same electric potential, the minerals carried in solution will bond to the resin and be removed from the water. Those minerals inevitably cause the water to be either acidic (negative charge) or alkylid (positive change).. The beads cause the remaining water to be closer to a net zero charge, hence ' de-ionized '. Ph very nearly neutral.
Reducing the number of charge carriers in the water simply increases the ability of that de-ionized water to accept charged particles in the future. More of a blank slate, so to speak. That ability to readily accept greater than typical amounts of charge make it easier to break weak electrochemical bonds and lift particles off of the surfaces in contact with the water.
I've seen that demonstrated decades ago during a corrosion treatment class. Ball point pen ink scribbled onto a vinyl desktop... Sprayed with normal household cleaners, that stuff is permanent. Mix the soap concentrate into de-ionized water, and that stuff jumps off the surface. Freaking amazing.
Interestingly enough, the less ions in the water, the less conductive it becomes. Absolutely pure water is a great insulator from electrical current. Chemically neutral, no ions at all. H2O is a perfectly neutral molecule. Battery electrolyte is acidic to provide extra negative charge carriers.... Negative ions......
Nuclear reactors use the absolutely purest water imaginable, and are routinely pressurized to 500 psi for greater efficiency in heat transfer. Forcing more contact by that higher pressure transfers more energy for any given surface area.
A more dense transfer fluid would be more efficient, and has been tried in the past. Sodium has been used once or twice as the fluid within a fission reactor. The risks were greater than the benefit.