When hydrogen is burned, water vapor is formed. During running this will be blown out of the exhaust, but when the engine is stopped some will no doubt condense, so could corrode steel in the engine. But it is less likely than for a gasoline engine where other combustion products like nitrogen oxides are also formed, and these are more corrosive. I have no direct experience but hydrogen engines are said to be much cleaner than gas or diesel ones
the engine would corrode and get limescale.
By burning the hydrogen and making water.
usually there is a fuel leak internally however it can also be an air leak
It may corrode parts of engine, you may have to fill in more often as alcohol runs out quickly.
To fuel it and cool it
Liquid hydrogen and liquid oxygen
A hydrogen engine works by combusting hydrogen fuel with oxygen to generate power, similar to a traditional internal combustion engine. Hydrogen gas is injected into the engine where it mixes with air and ignites to create energy that moves the pistons. The byproduct of this process is water vapor, making it a clean and environmentally friendly alternative to fossil fuel combustion engines.
Fuel cells operate by combining hydrogen and oxygen without actual combustion as in gasoline engines. A catalyst separates the electrons and protons to combine the elements. (Some versions of fuel cells are high-temperature only.) Hydrogen gas
Water in gas can cause engine misfiring, decrease fuel efficiency, and corrode fuel system components. It can also lead to rust and contamination in the fuel system, potentially causing long-term damage if not addressed.
No, water cannot be used as a direct fuel in an internal combustion engine. However, water can be used in a process called electrolysis to produce hydrogen, which can then be used as a fuel source in internal combustion engines.
NOBUTHydrogen is an alternative fuel and with all alternative fuel changes must be made to account for the different burn characteristics to ensure the engine will not be harmed.
Rushing past the outside to cool the engine. Internally to mix with the fuel and make an explosive mixture inside the piston(s).