Each stroke in IC engines forms a sequence of operations in one cycle of IC Engines i.e suction stroke, compression stroke, expansion stroke, and exhaust stroke. Strictly speaking, when an engine is working continuously, we may consider a cycle starting from any stroke. We know that when the engine returns back to the stroke where it started,…
Valve Timing Diagram for a Four Stroke Cycle Petrol Engine – The petrol engines are also known as spark ignition engines. The valve timing diagram for a four stroke cycle petrol engine is shown in Figure below: The following particulars are important for a four stroke cycle petrol engine regarding valve timing diagram : (a) The inlet…
The scavenging, in an internal combustion engine (IC Engine), is the process of removing the burnt gases from the combustion chamber of the engine cylinder. Though there are many types of scavenging, yet the following are important from the subject point of view: 1. Crossflow scavenging. In this method, the transfer port (or inlet port for…
The indicated power of an IC engine (briefly written as I.P.) is the power actually developed by the engine cylinder. Mathematically, where K = Number of cylinders, pm = Actual mean effective pressure in bar (1 bar = 100 kN/m2), L = Length of stroke in meters, A = Area of the piston in m2, n =…
Testing of IC Engines – why is it done? The purpose of testing an internal combustion engine (IC Engine) are (a) To determine the information which cannot be obtained by calculations. (b) To conform the data used in design, the validity of which is doubtful. (c) To satisfy the customer regarding the performance of the engine. The majority…
The lubrication of IC engines is required to reduce tear, vibrations, over heating, and cleaning. The lubrication of IC engines has the following advantages : 1. It reduces wear and tear of the moving parts. 2. It damps down the vibrations of the engine. 3. It dissipates the heat generated from the- moving parts due to friction. 4. It cleans the…
Why thermodynamic tests are done on IC Engines? An internal combustion engine (IC Engine) is put to thermodynamic tests, so as to determine the following quantities: Indicated mean effective pressure Indicated power of an IC Engine Brake power of IC Engine Efficiency of an IC Engine
Valve Timing Diagram for a Four Stroke Cycle Diesel Engine – The diesel engines are also known as compression ignition engines. The valve timing diagram for a four stroke cycle diesel engine is shown in Figure below: The following particulars are important for a four stroke cycle diesel engine regarding valve timing diagram: (a) The inlet…
What is Octane Number? How rating of SI Engines (Spark ignition engines) is done using an octane number? The hydrocarbon fuels used in spark ignition (S.I.) engine have a tendency to cause engine knock when the engine operating conditions become severe. The knocking tendency of a fuel in S. I. engines is generally expressed by…
In a two stroke engine, the working cycle is completed in two strokes of the piston or one revolution of the crankshaft. In a four stroke engine, the working cycle is completed in four strokes of the piston or two revolutions of the crankshaft. The following are the advantages and disadvantages of two stroke over…