Originally Posted by
Omega
I would exercise caution when determining how much KOH or NaOH to add to your cell. If you ever boil a generator over, you'll know why.
I would suggest starting with 1/8th teaspoon per quart and run it in the car that way. If the cell stays cool for at least 45 minutes, add another 1/8th teaspoon. Continue to add until the temperature is 150F max, then stop. Go slow with adding this stuff. If you get temperatures above 150F, I think you could easily overheat on long runs or with higher underhood temperatures. If you are hooked up to a vacuum line, the water can boil at as low as 160F (if I recall correctly), one good reason to avoid hooking up to a vacuum line.
As you see the level drop in your generator, you should add only distilled water, not electrolyte solution. Water is being converted to hydrogen and oxygen, leaving the KOH or NaOH behind. IF you add solution the concentration will keep increasing until you get a boiling mess.
Bottom line - Go slow, be conservative.