Getting Down To Basics with Engines

Understanding the Importance of General Engine Components

We come first to the ignition system of an internal combustion engine that depends on the type of engine and the fuel being used in the unit. In the case of petrol engines, these are usually ignited by a precise and timed spark, while diesel engines by are ignited by compression heating.

In the case of a spark ignition engine, ignition is by a mixture of an electric spark from a spark plug, the timing of which should be controlled precisely. While this is the ignition type for almost all gasoline engines, the timing on the other hand for diesel engines is through a precise and controlled pressure pump and injector.

Because of the heat generated by the air compression during the compression stroke, there is an ignition which would happen as the fuel and air mixture temperature has taken over the autoignition temperature. Note that the biggest number of compression ignition engines are those of diesels where the fuel is mixed with the air after reaching ignition temperature.

As there is a large area present of fuel to the oxygen in air, fuels would burn faster and more efficiently. In order to develop a fuel air mixture, there must be an atomization of liquid fuels, and to do this, the traditional method is by using a carburetor in petrol engines and with the diesel engines’ fuel injection. The modern petrol engines nowadays use fuel injection too although there is a difference in the technology.

The supply of fuel into the cylinder of a simpler reciprocating engines would use a carburetor still. From the mid 1980s, carburetor technology in cars have attained a very high degree of precision and sophistication, but lost out on the cost and flexibility to fuel injection. Small engines though still remain to use the simple forms of carburetor, like lawn mowers and the more sophisticated forms of engines used in small motorcycles.

Vehicles that use gasoline of larger size have mostly moved to using fuel injection systems. In the case of diesel engines, the use of fuel injection system has been done since the timing of the injection would start and control the combustion.

In the case of autogas engines, it uses either fuel injection systems or open or closed loop carburetors.

Many internal combustion engines now require a fuel pump. As for diesel engines, an all mechanical precision pump system is used which delivers a timed injection into the combustion chamber, and thus, in order to overcome the pressure of the combustion chamber, there should be a time injection directed into the combustion chamber.

For four stroke engine, it has these parts of the engine, namely the crankshaft, connecting rod, one or more camshafts and valves.
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