All of us have a high fascination for cars and two-wheelers. Most people dream of having BMW’s, Mercedes, Porsche’s, Lamborghini’s, Harley Davidson’s or some fancy ones. But how many of you know about the systems on which these vehicles move. Running of engine, fuel supply systems are keys to any vehicle, making their movement quite smooth. Every person, who intends to buy two-wheelers or four wheelers, must possess ample knowledge about fuel system of the engine because fuel supply is like blood circulation in the body that enables the engine to run. As you all know, the cars, motorcycles belong to the internal combustion engine (I.C engine).
There are primarily two types of I.C engines, one of which is petrol engine which is a spark ignition/SI engine and the other one is diesel engine which is a compression/C.I engine. In S.I engine, the air-fuel mixture is ignited by means of electric sparks from spark plug & then only, combustion of fuel takes place & power is produced. On the other hand, in C.I engine, fuel is injected into the hot compressed air in the combustion chamber.
In SI engines, air-fuel mixture is prepared outside engine cylinder. Carburetor supplies the homogeneous and a combustible mixture in desired quality and quantity for smooth engine operations at all loads & speeds. Carburetor works in three stages i.e. idling, a rich mixture phase, cruising, a lean mixture phase & high power. The solex carburetor, used in FIAT cars is famous for ease of starting, good reliability, whereas a carter carburetor is used in GM vehicles. C.I engines do not use carburetors; instead they use a fuel injection system that injects fuel in the high temperature of compressed air. The common rail direct injection (CRDI), bosch injection, Multi point fuel injection (MPFI) are some of its types, MPFI being the most common one. It has two types - throttle body type where single injector is present at center of inlet manifold which sprays fuel & other is port type where there are multiple injectors at inlet port of each cylinder.
Injection system and carburetor both plays pivotal roles in fuel supply in respective engines. Inadequate or poor quality fuel supply means improper combustion, resulting in less power production, which hampers the running of the engine. So, it is strongly recommended that checking of the fuel supply system before buying any type of vehicles is a must.