Category: Internal Combustion Engines

In a four stroke SI engine, there is one power stroke in two revolutions of crankshaft and two strokes, viz., suction and exhausts are non-productive. If these two non-productive strokes could be served by an alternative arrangement especially without movement of the piston then there will be one power stroke for each revolution of the…

The four stroke compression ignition (CI) engine is very similar to the four-stroke spark ignition engine as shown in Figure 6.6, but it operates at a much higher compression ratio. The compression ratio of SI engines varies from 6 to 10 whereas in CI engines it ranges from 16 to 20. During the suction stroke, air…

The four stroke compression ignition (CI) engine is very similar to the four-stroke spark ignition engine as shown in Figure 6.6, but it operates at a much higher compression ratio. The compression ratio of SI engines varies from 6 to 10 whereas in CI engines it ranges from 16 to 20. During the suction stroke, air…

Working principle of an IC engine consists of thermodynamic cycle involved to generate the power and thermodynamic processes such as suction, compression, heat addition expansion and heat rejection. In this chapter, we will study the operating principles of four strokes and two strokes of spark ignition engine and compression ignition engine.

There are various terms which are frequently used in an IC engine and are discussed below.

There are several bases for classification of IC engines, some of the important bases can be explained as Number of Strokes per Cycle: IC engines can be classified as four stroke engines (4S) and two stroke engines (2s). In four stroke engines, the thermodynamic cycle is completed in four strokes of the piston or two revolutions…

“The heat engine, in which the combustion takes place inside the cylinder or the product of combustion (flue gas) directly goes to the cylinder and the heat energy of the flue gas is converted into mechanical energy, is known as Internal Combustion Engine (IC Engine).” The combustion may take place either inside or outside the…