This means that one engine cycles takes two complete rotations of the crankshaft (720°). The only stroke which produces torque (energy) is the power stroke, all the others are consuming energy. The linear motion of the piston is transformed into rotational motion of the crankshaft through the connecting rod.įor a better understanding, we’re summarising the piston initial position, valve position and energy balance for each stroke. In the animation below you can see clearly how the internal combustion engine works. Pay attention to piston position, valve position, the moment when the ignition occurs and the succession of the strokes.The internal combustion engine converts chemical energy into useful mechanical energy by burning fuel.Ĭhemical energy is released when the fuel-air mixture is ignited by the spark in the combustion chamber. Mechanical Engineering Interview Questions The gas produced in this reaction rapidly expands forcing the piston down the cylinder on the power stroke.Ī Two-stroke engine is an internal combustion engine in which the piston’s two strokes are required to complete single thermodynamic cycle.Ģ-STROKE engine is designed by DUGLAD CLERK in 1880, the expansion and exhaust takes place during 2-Stroke of piston. Ī four-stroke engine is an internal combustion engine in which the piston’s four separate strokes are required to complete single thermodynamic cycle.Ī 4-stroke engine is an internal combustion engine in which the piston completes four separate strokes- intake, compression, power, and exhaust- during two separate revolutions of the engine’s crankshaft, and one single thermodynamic cycle.Ĥ.
Definition Of Octane Number And Cetane Number? – Octane number is defined as the percentage, by volume, of iso-octane in the mixture of iso-octane and h-heptane. It is the measure of rating of SI engine. – Cetane number is defined as the percentage, by volume, of n-cetane in the mixture of n-cetane and alpha methyl naphthalene. Name The Main Steps Involve In 4-stroke I.c Engine? It is the measure of rating of CI engine.ĥ.
Among Two-stroke Engine And Four-stroke Engine Which Is Generally Preferred And Why? are drawn in.įuel vapor and air are compressed and ignition takes place.įuel combustion takes place and piston is pushed downwards.Ħ. Two stroke engine is generally preferred. Because it has smaller size for the same output.ħ. What Are The Advantages Of Lubrication In Ic Engine? During Idling Process, A Petrol Engine Requires Lean Or Rich Mixture?Ĩ.
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