An internal combustion engine has an ignition system which would depend on the type of engine and fuel used of the unit. A precisely timed spark would ignite petrol engines, while it is through compression heating that would ignite diesel engines.
Ignition of a spark ignition engine, would result from a mixture of an electric spark from a spark plug, with a controlled and precise timing. This type of ignition is applicable to almost all gasoline engines, while the timing of diesel engines is controlled precisely by the pressure pump and injector.
There is ignition as the temperature of the fuel and air mixture is taken over the temperature of its autoignition, coming from the generated heat by the compression of air during the compression stroke. Diesels composed the vast majority of compression ignition and this is because fuel is mixed with the air once the air has reached 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. Simple forms of carburetor maintained its use in small engines in forms of lawn mowers and in small motorcycles.
Automobiles using larger gasoline engines have 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.
Where autogas engines is concern, it uses the system of fuel injection or the 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.
Among the parts of the engine that are the key parts of a four stroke engine are as follows, the crankshaft, connecting rod, one or more camshafts, and valves.