What is meant by SI engine?

spark-ignition engine. Definition English: The term spark-ignition engine refers to internal combustion engines, generally petrol engines, where the combustion process of the air-fuel mixture is ignited by a spark from a spark plug.

What is SI engine and CI engine?

Definition of Si engine and Ci engine

Si engine is internal combustion engine that operates on the principle of spark ignition. It uses petrol and utilizes the Otto cycle. The diesel (Ci) engine is also an internal combustion engine, which uses diesel fuel and operates on diesel cycle.

How do SI engines work?

In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion. The expansion of the combustion gases pushes the piston during the power stroke.

Is petrol used in SI engine?

SI engines are commonly fueled on gasoline, with the fuel characterized based on octane number. The octane number defines the fuel’s ability to reduce autoignition or knock, with the higher the octane number, the higher the resistance to autoignition.

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What are the advantages of SI engine?

Advantages of SI Engine

  • It has a high auto-ignition temperature as compared to the CI or diesel engine.
  • Petrol engine is a light engine than a diesel engine.
  • SI engine produces low noise as compared to the CI engine.
  • It requires less maintenance.

Which is better Si or CI?

Thermal efficiency: Due to lower compression ratio, maximum value of thermal efficiency is lower in an S.I engine compared to that of C.I. 7… Weight : S.I engines are generally lighter in weight due to their lower peak pressures as compare to C.I engines that are generally heavier, due to higher peak pressure.

Which of the following is SI engine?

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.

Is CI a diesel engine?

The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to the mechanical compression; thus, the diesel engine is a so-called compression-ignition engine (CI engine).

What is the full form of CI engine?

Compression ignition (CI) engines

In a compression ignition engine only air or air plus residual combustion gases from the exhaust known as exhaust gas recirculation (EGR) is inducted into the chamber during the intake stroke, and compressed during the compression stroke.

Why SI engines are high speed engines?

SI Engines operates at higher speed due to their less compression ratio (i.e. less weight per unit power). They produce less torque and operates at higher speed.

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Who invented diesel engine?

Rudolf Diesel, who is best known for the invention of the engine that bears his name, was born in Paris, France in 1858. His invention came while the steam engine was the predominant power source for large industries. In 1885, Diesel set up his first shop in Paris to begin development of a compression ignition engine.

Which is the most preferred SI engine fuel?

For SI engines the aromatics are the best fuel and the paraffins are least desirable. The reason for this is normal paraffins exhibit the poorest antiknock quality when used in SI engines.

Who invented engine?

1876: Nikolaus August Otto patented the first four-stroke engine in Germany. 1885: Gottlieb Daimler of Germany invented the prototype of the modern gasoline engine.

What are parts of SI engine?

Components of SI engine:

  • Inlet Valve: Inlet valve in SI engine is the passage for the air-fuel mixture to enter into the cylinder of the engine.
  • Exhaust Valve: …
  • Cylinder: …
  • Piston: …
  • Spark Plug: …
  • Crankshaft: …
  • Connecting Rod:

What is the disadvantage of diesel cars?

Cons of diesel cars

Diesel cars tend to be more expensive to buy than similar petrol models. Diesel fuel usually costs more. Servicing can be more expensive, although you don’t need to do it as often. … Diesel engines can be slightly noisier.

What is a diesel engine made of?

Petroleum products normally used as fuel for diesel engines are distillates composed of heavy hydrocarbons, with at least 12 to 16 carbon atoms per molecule. These heavier distillates are taken from crude oil after the more volatile portions used in gasoline are removed.

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