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U is it correct that the exhaust gases emitted by a
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diesel engines are non toxic because all the fuel is burnt during combustion? In other words, can it be assumed that a diesel does not produce carbon monoxide although this gas is produced by a petrol engine?
AIf a diesel engine is emitting black smoke, combustion is far from complete. Black smoke is finely divided carbon which is produced when part of the carbon in the fuel (which is a hydrocarbon) is released in this form because there is insufficient oxygen in the cylinder to enable it to burn with the oxygen to form carbon dioxide. Alternatively, a portion of the combustible mixture may not burn completely because it is not heated to a sufficient temperature or heat is extracted at too high a rate by a cold wall of the chamber or cylinder.
As pointed out in a Q and A (CM January 231 much less carbon monoxide is produced by a diesel that is overfuelled than is emitted by a petrol engine that is running on a rich mixture. Briefly this is because the droplets of fuel in a diesel engine combustion chamber "burn from the outside". A fuller explanation is given in the Q and A mentioned.