A quick search on YouTube shows many people who are doing it, some exclusively on hydrogen. With some technical and mechanical ingenuity, you can build your own add-in system for less than $1000 USD, depending on how you go about doing it. I'm in the planning stages of such a system right now, taking what is already used and taking it a step further. The key is to be able to create an electronic pulse frequency tuned to the resonance of the entire electrical circuit, including the electrolysis chamber which basically acts as a giant capacitor. Cut down on the amperage and maximize voltage and you can create a lot of hydroxy gas (really hydroxy is H20 water, but in this case people use it to refer to a de-molecularized mixture of hydrogen and oxygen gases) with little energy (input from the engine). It only becomes incredibly inefficient and expensive when you try to extract pure hydrogen, which is a cost barrier to the common manufacture of hydrogen fuel. But since the hydrogen is only going to need oxygen to burn anyway, why bother isolating it completely from its already included stoichiometrically-balanced oxygen supply? In low volumes at least, it won't bond until it's ignited.
There is a catch, though. Of course.
Hydroxy (gas) burns much more quickly, completely, and efficiently than gasoline (injected as a fine mist mixed with air to simulate gaseous properties). Too much hydroxy can lead to detonation, or a premature explosion within a cylinder due to compression, known as "knocking" or "dieseling", similar to an engine struggling to continue to run below its idle RPM's. It can destroy a regular gas engine from the inside out, and it's why high-performance engines require high-octane fuel, which has a much higher compression tolerance than low-grade fuel. Second, hydroxy gas, both before and after combustion, oxidizes the metals inside the engine. This is solved by applying a thin coating of ceramic, but this can easily add tremendous cost as it usually requires completely rebuilding the engine, though there are additives you can put in your fuel an motor oil that pretty much accomplish the same protective coating. You also need to upgrade to an all 304 stainless-steel exhaust system for the same reason. Also, water freezes at a higher temperature than gasoline, so colder climates can pose a serious problem without an efficiency-robbing antifreeze additive. On top of all this, the electrolysis chamber needs to build up sufficient gas pressure before it can provide enough hydroxy gas to actually start the engine, so the system needs to be turned on a minute or two before the engine is started. Gasoline is still part of the process because it helps keep the hydroxy gas and water vapor hot enough to minimize oxidation, but also because there is limited space to put a hydrolysis chamber in a car, so unit size and consequently hydroxy output is limited; gasoline also helps retard the combustion in the cylinder enough to prevent detonation, as well as heat the engine enough so that it can run at its optimal temperature. Not to mention, if the hydroxy system fails, it's always good to have a reliable fall-back.
But overall, water has a much denser concentration of hydrogen in it than pure compressed liquid hydrogen, and is safer since it is much less explosive. It is viable for future vehicles with little immediate complexity for adaptation into current technology. It works with Otto-cycle (conventional), Wankel (rotary), and diesel engines. But there are a few bugs to be worked out.
It is a hybrid because it combines the use of both gasoline and hydrogen; it's just not a traditional gas-electric hybrid (hybrid just means mixed, traditionally mixed breeds or species, but in this case, it's mixed technologies or methods).
Free plans (some falsities need to be sifted out, hence they are free, but the concept and overall method is fairly scientifically sound; but they are also free because you can't patent the basic concept because it was first conceived in the early 1910's, and the patent has long since expired; so its public domain. However, most of the rest of the hosting site is bogus claims for totally free energy and government conspiracy theories. I used this as a rough starting point because the original plans were real and shown to work by someone else.)
Open forum devoted to such conversion projects (albeit hosted by someone who builds and sells ready-made solutions)
If you want to just mess around with it, put two metal plates in a tank of water, spaced closely together (but not touching) and connect each plate to one terminal of a 12V camping lantern battery. You could also just wire a 9V battery to two paper clips and put them in one of those amber prescription drug bottles. Take it a step further and refine the system on an old (but still running) four-stroke lawnmower (or similar) engine. Making electric pulses isn't strictly necessary, but it allows better control of just how much gas is being created.
P.S. Looking back on this I remembered that "
hydroxy"
gas as I mentioned is more correctly known as "Brown's Gas."
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