Identify The Major Variables In The Combustion Of Fuel

a) Identify the major variables that you controlled or measured in this investigation. What type of relationship do these variables have with each other?
The variable that we manipulated was the fuel to oxygen ratio and the variable that we observed was how efficiently the fuel burned in each of the mixtures. The efficiency of the combustion depended on the fuel to oxygen ratio. If mixture was fuel lean the combustion reaction would produce less soot and smoke. If the mixture was fuel rich, an incomplete combustion reaction occurred and it produced plenty of soot and smoke. The controlled variable was the amount of water in the test tube. If there was more water in one test tube and less water in the other, then it could affect the accuracy of the fuel to oxygen ratio and the outcome of the experiment.

b) Why was it necessary to keep
If the driver repeatedly does this for a long time, however, the engine gets flooded with more fuel than it needs. When the engine is flooded the car will not start, because the engine has too much fuel and not enough oxygen and it cannot be ignited. The engine with that has been flooded will not start unless the extremely rich mixture has been cleared.

e) What is meant by “Fuel Injection” and how does it help promote fuel efficiency and reduce emissions?
Fuel injection forces the fuel to directly enter the part of the engine where combustion occurs. Fuel injection systems can endure harsh combustion environments and operate at high fuel pressures. Moreover, this system allows precise control over the amount of fuel injected into the cylinder, the timing of the injection and the spray pattern. This can lead to increased fuel efficiency and an efficient combustion which leads to fewer emissions of soot, carbon dioxide, and carbon monoxide.

f) Discuss any devices or equipment common in today’s automobile that promote complete combustion or reduce harmful