HHO has been used since the early 70's. These devices failed for automobile applications due to the temperature increase in the combustion chamber. Older vehicle engines were not capable of handling the increase of temperature. From all of my research, I have found that HHO should be suitable to use in any engine that has EGR ( exhaust gas recirculation). These engines, due to the increased temperatures produced by burning recycled exhaust, have been made to handle increased temperatures in the combustion chamber. i.e. a vehicles combustion chamber, from what I researched, burns in the area of 850°, HHO increases the temperature by about 150-200° and the materials used in manufacture of newer engines can handle up to 1400°!. older engines were only capable of handling temperatures of around 1000°.

HHO is a relatively safe gas to use and handle, no more dangerous than lighterfluid. When used in your vehicle, you are using the gas as you create it so you are not storing it. These devices are hooked up to your car battery or alternator, an inline fuse and manual ON/OFF switch( optional--but I recommend), then hooked up to your vehicles intake system directly before your throttle body. These devices, from what I have read, use anywhere from 3amps to 20amps and at least 12v of current. The devices I make use about 4.5amps. NOTE: contrary to some sources on the internet, any device that draws under 20amps will NOT damage your alternator! Most radios and amplifiers on the market today draw more amps!

CAUTION: Now the bad part... In some rare circumstances, if your engine has a minute crack, crevice, ect; there may be a chance that the HHO (when cooled turns back into water) may seap into a crack and upon repetative uses of your vehicle, may cause this crack to expand resulting in severe engine damage. I have searched the internet to find an example of this and have yet to succeed--although scientists claim it can happen. Basically, what may happen at 200k miles may happen at 75k miles, which is a manufacturers defect if you ask me.

NOTE: before anyone installs a HHO device, I highly recomment adding a ceramic or teflon additive such as Slick50 or any others on the market at least 2 times a year. These products coat your engine and fill cracks associated to wear.