Difference Between Ic Engine And Si Engine Pdf

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Internal Combustion Engine Basics

A spark-ignition engine SI engine is an internal combustion engine , generally a petrol engine , where the combustion process of the air-fuel mixture is ignited by a spark from a spark plug. This is in contrast to compression-ignition engines , typically diesel engines , where the heat generated from compression together with the injection of fuel is enough to initiate the combustion process, without needing any external spark. Spark-ignition engines are commonly referred to as "gasoline engines" in North America, and "petrol engines" in Britain and the rest of the world. The working cycle of both spark-ignition and compression-ignition engines may be either two-stroke or four-stroke. A four-stroke spark-ignition engine is an Otto cycle engine. It consists of following four strokes: suction or intake stroke , compression stroke , expansion or power stroke , exhaust stroke.

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Internal Combustion Engine Basics

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Spark Ignition engine are those types of the engine where the combustion of the fuel occurs with the help of Spark Plug. In this type of engine, the Air-fuel mixture comes from the carburetor and enters the engine cylinder through the valves and then fuel is compressed in the compression stroke and finally, a spark is given by the spark plug to ignite the air-fuel mixture and we get power stroke. The engine where the rise in temperature and pressure during compression is sufficient to cause spontaneous ignition of the fuel. In this type of engine, only air is compressed in the engine cylinder after compression the temperature and pressure of the air are rising up and sufficient enough to burn the fuel sprayed by the fuel injectors.

Petrol engine British English or gasoline engine American English is an internal combustion engine with spark-ignition , designed to run on petrol gasoline and similar volatile fuels. In most petrol engines, the fuel and air are usually pre-mixed before compression although some modern petrol engines now use cylinder- direct petrol injection. The process differs from a diesel engine in the method of mixing the fuel and air, and in using spark plugs to initiate the combustion process. In a diesel engine, only air is compressed and therefore heated , and the fuel is injected into very hot air at the end of the compression stroke , and self-ignites.

Hello Readers In the last session, we had discussed SI Engines along with the working of the SI Engine and also derived the equations to calculate the efficiency of the Otto cycle whereas, in today's session, we will discuss the differences between SI Engine and CI Engine in a detailed way. Before diving into the differences, you need to know the basics of Spark-Ignition Engine and Compression Ignition Engine.

Petrol engine

Pankaj Mishra is a blogger by passion and Mechanical Engineer by profession. He has completed his B. Tech degree in mechanical engineering in the year He loves to share his knowledge and help others. Modern Diesels are easy starting, lighter weight, rev much higher, are far more flexible and very efficient.

In SI engines petrol or gasoline is used as fuel, hence these engines are also called petrol engines. In CI engines diesel is used as fuel, hence they are also called diesel engines. Type of cycle used : In the case of SI engines, the Otto cycle is used. In this cycle, addition of heat or fuel combustion occurs at a constant volume.


Difference Between SI (Spark Ignition) and CI (Compression Ignition) Engine [​PDF]. Amrit Kumar overview of SI and CI Engine. And After the article, you will find the PDF downloadable link. Internal Combustion Engine. Difference Between.


4 Response
  1. Hossana C.

    An engine or motor is a machine designed to convert one form of energy into mechanical energy.

  2. Andre S.

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  3. Kimberly C.

    Internal combustion engines provide outstanding drivability and durability, with more than million highway transportation vehicles in the United States relying on them.

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