# Why does incomplete combustion occur?

Dec 3, 2015

A typical diesel fuel, ${C}_{16} {H}_{34}$, is so long that complete combustion is quite difficult (sometimes the fuel is unsaturated, but the stuff is a mixture of many hydrocarbons). Engineers try to maximize the energy output with respect to oxygen gas intake, and size of the cylinder or furnace. Diesel engines (as well as petrol engines) still produce quantities of carbon monoxide, and carbon (as particulate soot).