Actually years ago they made add on water injector systems for cars. It was supposed to give you more power and cooler running engine. I never bought one so I don't really know how well it worked. The information as I recall talked about a very fine mist injected in the carb throat. I have been thinking about when I get some time trying to build a system to try on a conversion engine. I think it might be interesting or it could turn out to be more work than it's worth, I don't know. Just my 2 cents worth of opinion. Ron