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HHO generators uses the basic and very old process of electrolysis of water (H2O) to convert it to its gaseous state (HHO). For a car, truck or other vehicle, the HHO generator fits either under the hood or in the trunk or bed.
Once the HHO generator creates gas from water, this is then injected into the vehicle's intake system. The hydrogen and oxygen (sometimes called hydroxy or oxyhydrogen) helps the gasoline or diesel fuel burn more cleanly inside the cylinders.
This clean burn means fewer emissions and increased gas mileage. It must be noted that both hydrogen and oxygen are flammable and combustible in the gaseous state.
How HHO generatosr work exactly has been a debate for years. Ever since William A. Rhodes (Rhode's gas) and Yull Brown (Brown's gas) applied for patents in the 1960's and 1970's concerning HHO gas and showed its use in welding applications, critics have been calling this snake oil, scams, and other choice names.
What the critics have yet to explain however is the fact that it actually does work. Yull Brown used an HHO torch to weld materials and even burn himself on the forearm to prove that an HHO generator can produce clean gas with a high temperature (over 6,000 F).
A company that Rhodes started in Phoenix, Arizona called Arizona Hydrogen Manufacturing is now selling HHO generator based welding machines that electrolyze water to create the gas for a high temperature flame. It's hard to call something snake oil when there is irrefutable visual evidence that it works.
So, because HHO gas is not well understood on an atomic scale, some people tend to pan what they don't understand. But, nevertheless, HHO generators are here to stay as their demand in the automotive industry increases daily and their use in the welding industry is also a hot commodity. Technological conservatives will soon give way to the progressives on this one.