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Internal Combustion Engine

Internal Combustion Engine
Engine Components
Four-Stroke-Cycle Spark-ignition (Petrol) Engine
Valve Timing Diagrams
Two Stroke Spark Ignition Engine
Difference Between Two & Four Stroke Cycle Petrol Engines
Four Stroke Cycle Compression Ignition (Diesel) Engine
History of Diesel Engine
Two Stroke Cycle Diesel Engine
Comparison of Two and Four Stroke Cycle Diesel Engine
Comparison of S.I. and C.I. Engine
Piston Displacement or Swept Volume
Engine Torque & Engine Power
Compression Ratio

Internal combustion engines are one of the building blocks of modern civilization. In an internal combustion engine, the combustion takes place inside a confined chamber. All internal combustion engines burn a mixture of air & fuel. The fuel can be gasoline, diesel, methane, propane etc.

The piston is the heart of an internal combustion engine..The concept of the piston engine is that a supply of air-and-fuel mixture is fed to the inside of the cylinder where it is compressed and then burnt. This internal combustion releases heat energy which is then converted into useful mechanical work as the high gas pressures generated force the piston to move along its stroke in the cylinder. It can be said, therefore, that a heat-engine is merely an energy transformer.

To enable the piston movement to be harnessed, the driving thrust on the piston is transmitted by means of a connecting-rod to a crankshaft whose function is to convert the linear piston motion in the cylinder to a rotary crankshaft movement (Fig. 1.1-1). The piston can thus be made to repeat its movement to and fro, due to the constraints of the crankshaft crankpin’s circular path and the guiding cylinder.

Internal Combustion Engine

The backward-and-forward displacement of the piston is generally referred to as the reciprocating motion of the piston, so these power units are also known as reciprocating engines.