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How HHO Generators Work

The generator converts water into burnable vapors. It uses a chemical process of electrolysis that is easily powered by the charging system of an internal combustion engine.


Hello, I'm interested in this generator and have seen others fitting these to vehicles but cannot understand how it would reduce fuel cost, I may be missing an obvious part here but how would the hydrogen being delivered to the inlet manifold lower the predetermined petrol or diesel delivery? In other words the hydrogen would reach the combustion chamber ready to combust with the normal petrol/ diesel fuel but you wouldn't of saved any petrol/ diesel quantity because the engine doesn't know that there is hydrogen in the system and would not automatically lower fuel trim to suit the addition. Also would the hydrogen being more volatile pre-detonate before conventional combustion of the original fuel causing the engine to run inefficiently?


The fuel trim, as you state it, is your foot.

You mash down on the fuel peddle to get the vehicle to respond to your action.
The reaction is so normal to you, that you don't think about it doing anything but make the vehicle Go.
More on this later.
When a welder wants to cut a piece of steel, he/she adds more oxygen to the fuel in order to get a hotter flame; a whiter flame.
It is the oxygen that allows the chemical process of burning to take place. Without the an oxidizer there would be no flame. By controlling the amount oxygen, the welder is able to adjust the flame for his needs. Sometimes the gas he is using is not volatile enough for the job; so he mixes another more volatile gas -- and adjusts the oxygen. If you add oxygen to a burning match or a burning candle, the flame will get taller and the color will become brighter. Are you with me?
Our engines are designed to be Air Pumps. They draw in Air, then push it out the exhaust. Why? Because 10% to 20% of that Air is oxygen. Oxygen (an Oxidizer) needs to be mixed with the Fuel in order to get the chemical reaction of Fire.
The air plays a Major part in the combustion efficiency. Our fuel delivery systems are designed to control the mixture. By controlling the amount of air, one can control the volatility of the burn. The amount of Air is metered to the amount of fuel. The EPA has established that 14.7 parts Air are needed for each part of fuel vapor. They call that a Stoichiometric mixture; meaning it provides the cleanest burning of emissions, overall, and thus they mandate the engine manufacturers to abide by their standards. That is hogwash.
At 14.7 parts Air, the fuel does not completely burn. Excess fuel makes it into the exhaust system, and a Government mandated Catalytic Converter is used to burn it , before it exits the exhaust pipes. That is not Fuel Efficiency. It causes us to buy more fuel; not less fuel. That is a Scam.
It is a simple fix, right; just add more oxygen. Well, that is not so easy. You see, the EPA computerized our Fuel Delivery systems when engine manufacturers got rid of Carburetors and replaced them with Fuel Injectors; We no longer have control of the Air / Fuel Ratio. In fact, it is a violation for us to tamper with the adjustment. They have their hands in our pockets, and we can not do much about it. We are forced to pay the price at the pumps. At the pumps, we are Taxed in order to feed the system.
So how can HHO increase fuel efficiency? Remember the Air! The percentage of Oxygen varies --- and the computerized emissions system adjusts the fuel according to the oxygen level. By adding more oxygen to the contents of the air, more oxygen makes it to the combustion chambers. without changing the Air/Fuel Ratio. Plus, the air is more volatile now because it also contains more Hydrogen Gas. When Hydrogen burns, it also burns any fuels that are around it. We now have a hotter, more efficient burn; and less wasted fuel makes it into the exhaust system.
I need to take this a little further. Engines are engineered to operate within a certain heat range; the higher the compression ratio, the hotter the burn that is allowed. If the Air/Fuel ratio is too high, the heat can be too much, thus the pistons can be damaged. HHO solves this problem. You see, when Hydrogen burns, the by-product is pure Water. In the combustion chambers, water is turned to steam. The steam cools , and cleans, the combustion temperatures and the exhaust.
Engine manufacturers have know this for 100 years. Do the research. Seek and Yee shall find. The amount of energy in one part of fuel vapor is more than 10 times what we are allowed to use. Ford built a carburetor that got 250 MPG on a big V-8 engine.
In conclusion, the process of using HHO to increase fuel efficiency has drawn a lot of criticism from those whom oppose it. The EPA has mandated computerized sensors to monitor engine fuel efficiency. Newer engines recognize the combustion temperatures and adjust for maintaining fuel efficiency --- so we use more fuel than we need. Do the research.
If you plan on using HHO, I suggest searching the web, for HHO information on your particular vehicle. You are looking for ways of beating the computer, without violating EPA laws.
If you want better fuel economy, you can get 2 to 5 mpg more just by getting rid of those old technology spark plugs. Replace them with Pulstar Pulse Plugs. They create a Plasma arc that burns more of the fuel around it than any spark plug.
Hope this Helps !




Once your engine has started, a Go-no-Go sensor needs to signal a relay to turn on the hydrogen generator. This is a safety feature that enables the generator to operate only while the engine is running. Should the engine stall or stop for any reason, the generator needs to turn off; even if the ignition switch is left on.

Now that the hydrogen generator is turned on, it begins using your vehicles charging system to pass an electrical charge through a series of electrodes that are separated by water chambers. The water contains a catalyst which is used to promote hydrogen and oxygen vapor production on the surface area of the electrodes.

The vapors produced in the hydrogen generator are then added to the air that enters the engine. The addition of these vapors richens the metered air that mixes with the fuel vapors. The metered air is now more volatile; oxygen content is higher; hydrogen fuel has been added; moisture content has increased. All of this enables a more complete burning of the fossil fuel. By burning more of the fuel, inside the combustion chamber, harmful hydrocarbons and carbon monoxide emissions are reduced. The engine becomes more efficient; less unburned fuel escapes out the exhaust; carbon buildup is removed; combustion chamber temperatures are reduced; and harmful greenhouse gases are reduced to levels that are less destructive to our environment.


A Hydrogen Generator turns water into burnable vapors; the engine ignites them in the combustion chamber, and the heat that is produced reforms the vapors back into water. In other words, we use water to burn fuel. We use water vapor to clean and cool the combustion chamber. The end result, we use water to reduce the "Greenhouse" exhaust emissions. We can do this - without tampering with emission sensors and without voiding your vehicles Warranty.

It is so simple. The oxygen content of our engines metered air to fuel ratio - is not high enough to burn all of the metered fuel vapors. By adding more oxygen to that 14.7 parts of metered air, we are increasing the oxidizer content of the air without changing the air fuel ratio. The increase burns up all or most all of the metered fuel. But don't forget the hydrogen. It is a fuel that burns other fuels around it.



Combustion or burning is a chemical process, an exothermic reaction between a substance (the fuel) and a gas (the oxidizer), usually O2, to release heat.

  Complete Combustion:
In complete combustion, the reactant will burn in oxygen, producing a limited number of products. When a hydrocarbon burns in oxygen, the reaction will only yield carbon dioxide and water. When elements such as carbon, nitrogen, sulfur, and iron are burned, they will yield the most common oxides. Carbon will yield carbon dioxide. Nitrogen will yield nitrogen dioxide. Sulfur will yield sulfur dioxide. Iron will yield iron (III) oxide. Complete combustion is generally impossible to achieve unless the reaction occurs where conditions are carefully controlled.
  Incomplete Combustion:
In incomplete combustion there is an inadequate supply of oxygen for the combustion to occur completely. The reactant will burn in oxygen, but will produce numerous products. When a hydrocarbon burns in oxygen, the reaction will yield carbon dioxide, water, carbon monoxide, and various other compounds such as nitrogen oxides. Incomplete combustion is much more common and will produce large amounts of byproducts, and in the case of burning fuel in automobiles, these byproducts can be quite lethal and damaging to the environment.

Does Oxygen Burn?

The question is one of definition.  For combustion or burning to occur you need two things -- a fuel and an oxidizing agent. By definition, the fuel burns in the oxidizing agent. Both fuel and oxidizing agent are chemically changed but (by definition) only the fuel "burns". For example carbon (in the form of charcoal) is a fuel and will react with oxygen (oxidizing agent) to form a new compound, carbon dioxide.

Oxygen is the most common oxidizing agent (there is a reason for the similarity in the words oxygen and oxidizing...) and it is also one of the strongest.  Because oxygen is such a strong oxidizing agent there is nothing that will oxidize oxygen, hence oxygen does not "burn".  However, oxygen is (almost) always a required component of a flame.

While oxygen itself is not flammable it is a very dangerous chemical because it can react with any fuel in its presence. When high pressure oxygen is used extreme care must be taken so that it does not come in contact with any fuels or it will cause an explosion.

Handle oxygen with extreme care -- especially pure and / or compressed oxygen!

Another way to say this is that burning and combustion are names for specific types of chemical reactions in which one of the reactants is oxygen.  Since oxygen does not react with oxygen it cannot burn.


Page Last Edited - 04/03/2022

    Copyright 2003   All rights reserved.   Revised: 04/03/22.                                             Web Author, David Biggs
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