Air/Fuel Ratio

Question 0

14:7:1 ratio

Answer 0

HC and CO levels fall, NOx increases, close to peak power and efficiency, temperature at max and NOx peaks

Question 1

Consequence of low air/fuel ratio

Answer 1

Rich mixture combustion poor, u burnt HCs and high CO, low temperature -> low NOx BUT poor power output

Question 2

Moving leaner

Answer 2

NOx and CO reduced but flame ignition and propagation efficiency not good which leads to unburnt fuel

Question 3

VOC (hydrocarbons and oxygenated/chlorinated derivatives)

Answer 3

Health risk, photochemical smogs to ozone, carcinogenicity of compounds e.g. Benzene and 1.3 butadiene.