Machine Parts

Purpose of Spark Advance Mechanism:  The purpose of Spark Advance mechanism is to assure that under every condition of engine operation ignition takes place at the most favorable instant in time that is most favorable from the stand point of engine power, fuel economy, exhaust dilution.  Fuel System: In a fuel system contains gasoline which is stored in a fuel tank. This fuel   (Gasoline) supply to the carburetor by using pump.   A carburetor which mixes the gasoline with air and fuel lines connecting the area.  Fuel Pump: There are two types of fuel pump a.       Mechanical fuel pump and b.       Electric fuel pump

Fuel Injection System: There are two fuel injection system- a.       Air injection system b.       Solid injection system. Advantages of air injection system: 1.       Good atomization due to large pressure. 2.       Heavy and viscous fuels can be injected. 3.       Fuel pump is required to develop a small pressure. Disadvantages of air injection system: 1.       Requires a high pressure multi-stage compression. 2.       Separate mechanical linkage is required to operate the fuel value. 3.       Overheating and burning may occur. 4.       Low output pressure. 5.       Sticky of fuel valve may occur.

1.       Meter quantity of fuel as per speed and loads. 2.       Distribute the metered fuel equally among the cylinders. 3.       Inject the fuel as the correct time in the cycle. 4.       Inject the fuel at the correct rate. 5.       Inject the fuel with required spray pattern and atomization demand by the combustion chamber. 6.       Begin and end injection sharply without dribbling of after injection. To   fullfill the all requirement the injection system consist of  1.       Pumping elements. 2.       Metering elements. 3.       Metering controls. 4.       Distribution element. 5.       Timing control.