The International Open Source Hydrogen On Demand Builders Network.
Thinking of writing another monograph on the similarities between HHO and LENR* such as:
Large energy yields, in one test at UNOH the yield was 19.8 MJ per gram of hydrogen injected. That is about 160 times greater than the the heat of combustion and that is not raw energy, it is mechanical output on the engine shaft. The raw yield would have been about 3 times greater.
Excess energy. In these tests, this energy output may have been greater than energy available in the fuel since average exhaust temperatures increased. No study has ever been done of the effect of HHO on the energy budget of an engine that I know of.
Classical explanations that are usually given, do not explain typical efficiency increases very well, in a way consistent with all the data.
Adding more HHO increases efficiency only up to a point. Under certain conditions a spike in the efficiency occurs. It may be that the metal in the cylinder is involved in the LENR. Increased surface area or the quality of surface may allow use of much larger HHO quantity to get a proportionately larger spike perhaps reducing fuel to nominal use as an ignition source in the case of a Diesel engine design.
Efficiency increase sometimes does not occur until HHO has been flowing for a bit or continues for a while even after HHO is shutoff. This would be consistent with the effect being controlled by a very small amount of agent absorbed onto the inside surface of the cylinder.
Results vary widely indicating factors exerting a strong effect that are not clearly understood.
HHO involves use of electrolysis and hydrogen, common factors in LENR experiments.
* LENR stands for Low Energy Nuclear Reaction. A website that gives a good overview of this subject is: http://www.lenrproof.com