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Internal combustion engine


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A slide on internal combustion engine two stroke and four stroke and their difference. Its just a simple slide, not explained in too much detail. Effects and timings already added.

-Two stroke engine
-Working of Two Stroke engine
-Advantages and disadvantages of two stroke engine
-Four stroke engine
-Working of four stroke engine
Advantages and disadvantages of Four Stroke Engine
-Which is better

Published in: Automotive
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Internal combustion engine

  1. 1. An Engine is a machine that converts heat energy into mechanical energy using fossil fuels. Majorly there are two kinds of engine: 2 stroke engine and 4 stroke engine. Christian Huygens had invented the first internal combustion engine.
  2. 2. oA two-stroke, or two-cycle, engine is a type of internal combustion engine which completes a power cycle in only one crankshaft revolution and with two strokes, or up and down movements, of the piston.
  3. 3.  1st stroke (compression stroke): Engine intakes fuel and compress it.  2nd stroke (power stroke): Spark plug ignites fuel, the heat energy produced exerts ultimate power on piston downwards.
  4. 4. Drawback Advantages  Lack of valves, which simplifies construction and lowers weight.  Can work in any orientation.  Good power to weight ratio.  Fire once every revolution, which gives a significant power boost.  Lack of lubrication system makes the engine wear faster.  Necessity of oil addition in the fuel.  Low efficiency.  Produce a lot of pollution.
  5. 5. A four-stroke engine (also known as four-cycle) is an internal combustion engine in which the piston completes four separate strokes which constitute a single thermodynamic cycle.
  6. 6.  1st stroke (intake): Air-fuel mixture is drawn in.  2nd stroke (compression): Intake fuel is then compressed.  3rd stroke (power stroke): Fuel is ignited with spark through spark plug.  4th stroke (exhaust): Burned gases is pushed out.
  7. 7. Drawback Advantage  Lubricant system makes the engine more wear resistant.  More efficient than 2 stroke engine.  No addition of oil in fuel, hence less pollution.  Complicated construction.  Should work in horizontal position due to lubrication.
  8. 8. 2 stroke engine 4 stroke engine  Lighter weight.  Operates in many positions.  Higher power to weight ratio.  Engine oil usually mixed with fuel.  Louder operation.  Higher engine speed.  More vibration.  Heavier weight.  Operates in limited position.  Lower power to weight ratio.  Engine oil in a reservoir.  Quieter operation.  Slower engine speed.  Smoother operation.
  9. 9.  Both engines are useful in terms of their sector of use.  2 stroke engines can be used in smaller operations as it is smaller, light weight, and easy to make.  4 Stroke engines can used for heavy duty operations as it is more wear resistant, quite and more efficient.