Automobile Engineers League

Construction & Working About Cooling System Introduction: Cooling system is used in the engine to run the engine by keeping cool, and working it without getting over heat. Type of cooling systems: ·          According to air cooling ·          According to water cooling Air cooling: Most modern   internal combustion engines   are cooled by a closed circuit carrying liquid   coolant   through channels in the engine block and cylinder head, where the coolant absorbs heat, to a   heat exchanger   or   radiator   where the coolant releases heat into the air. Thus, while they are   ultimately   cooled by air, because of the liquid-coolant circuit they are known as   water-cooled. In contrast, heat generated by an air-cooled engine is released directly into the air. Typically this is facilitated with metal   fins   covering...

Construction & Operation Of Fuel Injectors, its Nozzle & Fuel Filters. FUEL INJECTOR (OR ATOMISER) The purpose of the fuel injector is to inject a small volume of fuel in a fine spray and to assist in bringing each droplet into contact with sufficient oxygen to give quick and complete combustion.  Fig. shows C.A. V. fuel injector. It consists of a needle valve which is pressed on its seating in the nozzle by a plunger or spindle. A compressionspring controls the pressure upon the plunger by which the needle valve opens. A nozzle is attached to the body of the injector by a cap nut. The fuel enters the nozzle through drillings in the injector body. The fuel may pass from a gallery down the sides of the lower parts of the needle valve, or it may enter an annular groove in the nozzle and then pass through drillings to a point just above the nozzle seat. The body or the nozzle holder provides access for the fuel and an outlet for the fuel that leaks into the area occup...

CONSTRUCTION OF GASOLINE FUEL INJECTION SYSTEM.      There are many different gasoline fuel injection systems now being used on vehicles. Most systems are  of the four major types :  1. Electronic control throttle body injection (TBI) 2 Electronic control port fuel injection (PFI)  3 Mechanical control continuous injection systems (CIS) 4, Electronic control continuous injection systems (CIS-E)    Most electronic fuel injection systems only inject fuel during part of the engine's combustion cycle. The engine fuel needs are measured by intake airflow past a sensor or by intake manifold pressure (vacuum). The airflow or manifold vacuum sensor converts its reading to an electrical signal and sends it to the engine control computer. The computer processes this signal (and others) and calculates the fuel needs of the engine. The computer then sends an electrical signal to the fuel injector or injectors. This signal determines the amo...