I don't believe in 8 types of Qi. Or Chi. Whatever. I think that is just ancient Chinese Mystique. I believe that there is only one kind of Chi, which is the simple energy of the body that gives you life. There are probably at least 8 meridians, or pathways where the chi flows naturally, and these meridians can be blocked by injury or by intentional interference through accupuncture and other manipulations. I can give very good examples of this.
The problem with trying to use Chinese to explain these things is that it is way to general with somewhat broad meanings at times. Especially if Chinese is not your first language.