What is SI and CI engine?

What is SI 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.

What is the function of SI engine?

The spark is generated with the help of spark plug. Since in this engine, the spark is responsible for the ignition of the fuel, it is named as spark ignition engine (SI engine). This engine uses petrol as a fuel for its working. It works on the principle of otto cycle.

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.

What is called SI engine?

V. Kochi, Kerala. Spark plugs are used in the petrol engines to ignite the air fuel mixture whereas in diesel engines the presence of spark plugs is not necessary. Technically petrol engines are called as spark ignition engines ( SI ) and diesel engines are called as compression ignition engines (CI ) .

Which fuel is used in SI engine?

The spark-ignition engine (Fig. 20A) is the universal engine for all fuels of low inflammability, especially gasoline (a mixture of several hydrocarbons), but also liquefied petroleum gas (LPG), liquefied natural gas (LNG), methanol and ethanol (alcohols), and hydrogen.

Why are diesel engines called CI?

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 mechanical compression; thus, the diesel engine is a so-called compression-ignition engine (CI engine).

What is BDC and TDC?

TDC – Top Dead Centre is traditionally the position of an internal combustion engine’s piston when it is at the very top of its stroke. BDC – Bottom Dead Centre is the opposite, when the piston is at the very bottom of its stroke.

What is the compression ratio of SI engine?

Detailed Solution