Carbon deposition damage
First of all, carbon deposition is a complex mixture. In addition to the main carbon components, there are various metal components (there are no more than a dozen common metals for fuel oils). The carbon deposit of the engine is not like the "honeycomb" that we burned before. A simple high temperature is impossible to burn off the carbon. In theory, whether carbon can be burned in the end, it can be said that in the best case, it will not burn 10% of carbon.
Secondly, and most importantly, the high temperature generated by hydrogen can reach more than 3,000 degrees, while the engine combustion chamber design temperature, the piston temperature is about 400 degrees, the exhaust valve temperature is 600-800 degrees, and the maximum combustion temperature of the combustion chamber is 1800 degrees. The instantaneous temperature of the combustion chamber when the piston reaches the top dead center). In the normal temperature range, the engine's cooling system can function normally. If it reaches more than 3,000 degrees, the engine's high temperature oxidation resistance and high temperature corrosion resistance, fatigue performance, fracture toughness, etc. will be greatly reduced. At this time, the running engine will wear sharply. Increase.
Furthermore, at high temperatures, the N0x compound in the exhaust gas is greatly increased. The NOx compound is a harmful gas that is more than a hundred times more toxic than CO and is very harmful to the human nervous system.