The global oil crisis was attenuated by the new nuclear energy and with the help of the electrical engines introduced (especially in the public transportation), but it wasn’t past. One can understand in these conditions the new high costs for the combustibles obtained from petroleum (gas, diesel oil, etc…). A new combustible is necessarily now (for the engines with internal combustion). This combustible must be found in unlimited quantity. The single future possible combustible (which pass all the conditions) for the new internal combustion engines, is the HYDROGEN. The hydrogen can be extracted from water (and from any elements). When it was tested like a possible internal combustible, one has utilized the classical Otto-engines at a low shaft rotation (2500-6000 rpm). A normal rpm for hydrogen is a 25000-60000 value. The hydrogen burning process is ten time more quickly than the classical combustibles burning process. For this reason the shaft-rotation must support a ten times increase, as well. This is the first small technical difficult part, in the process of introducing the hydrogen like internal combustible in the Otto-engines. Another small difficult in this process is the high efficiency obtaining of hydrogen and its storage method. With a highly shaft rotation engine with hydrogen, we may obtain a “Compact Otto Engine" which can give the same power parameters at a lower combustible consumption, without emissions.

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