Difference Between Ic Engine And Si Engine Pdf

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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.

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Kishor Rambhad Prof. SI Engines A spark-ignition 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. Fuels Spark-ignition engines are commonly referred to as "gasoline engines" in North America, and "petrol engines" in Britain and the rest of the world. CI Engines The diesel engine also known as a compression-ignition or CI engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel which is injected into the combustion chamber is caused by the elevated temperature of the air in the cylinder due to mechanical compression adiabatic compression.

Diesel engines work by compressing only the air. This increases the air temperature inside the cylinder to such a high degree that atomised diesel fuel that is injected into the combustion chamber ignites spontaneously.

Diesel engines can operate on a variety of different fuels, depending on configuration, though the eponymous diesel fuel derived from crude oil is most common. The engines can work with the full spectrum of crude oil distillates, from natural gas, alcohols, petrol, wood gas to the fuel oils from diesel oil to residual fuels. CI vs. While combustion in an SI engine is essentially a flame front moving through a homogeneous mixture, combustion in a CI engine is an unsteady process occurring simultaneously in many spots in a very non-homogeneous mixture controlled by fuel injection.

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Spark-ignition engine

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. In a four stroke engine, the cycle of operation is completed in four strokes of the piston or two revolutions of the crankshaft. Fuel is directly injected as droplets into Combustion Chamber passing through the fuel injectors.

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. The basis of working of CI engines is the Diesel cycle. In this cycle the addition of heat or fuel combustion occurs at a constant pressure. The air-fuel mixture is injected via the carburetor that controls the quantity and the quality of the injected mixture.

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Internal combustion Engines: Carburetor, Fuel injection Upper compression ratio in SI engines is limited by the auto- Comparison of SI and CI Engines p g.


Difference Between SI Engine and CI Engine

Internal combustion engines provide outstanding drivability and durability, with more than million highway transportation vehicles in the United States relying on them. Along with gasoline or diesel, they can also utilize renewable or alternative fuels e. Combustion, also known as burning, is the basic chemical process of releasing energy from a fuel and air mixture.

Petrol engine

Engine is a machine that converts some form of energy into mechanical work. Internal combustion engines can be divided according to several characteristics. Depending on the creating of mixture and the ignition the thermodynamic process , engines are divided into: Otto spark ignition and Diesel compression ignition engines. The four-stroke petrol engine performs the working cycle in four steps. During that time, the crankshaft makes two turns.

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.


The Spark Ignition (SI) engine, as its name indicates uses spark to ignite the fuel. And in Compression Ignition (CI) engine, the air is compressed within the cylinder and the heat of this compression air is used to ignite the fuel.


Difference Between SI Engine and CI Engine

An engine or motor is a machine designed to convert one form of energy into mechanical energy. The internal combustion engine is perhaps the most common example of a heat engine, in which heat from the combustion of a fuel causes rapid pressurisation of the gaseous combustion products in the combustion chamber, causing them to expand and drive a piston , which turns a crankshaft. Electric motors convert electrical energy into mechanical motion, pneumatic motors use compressed air , and clockwork motors in wind-up toys use elastic energy. In biological systems, molecular motors , like myosins in muscles , use chemical energy to create forces and ultimately motion.

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.

2 Response
  1. Henri B.

    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.

  2. Kristian C.

    in S.I engines,ignition process is carried out with the help of a spark plug which ignites a mixture of air and fuel that is compressed in the combustion chamber. Whereas,a diesel engine also known as Compression Ignition (C.I) engine works on the basis of Diesel cycle or Constant pressure heat addition cycle.

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