Hence in the case of CI engines, the ignition of fuel occurs due to compression of the air-fuel mixture and there is no need for spark plugs. Compression ratio for the fuel : In the case of SI engines, the compression ratio of the fuel is in the range of 6 to 10 depending on the size of the engine and the power to be produced. In CI engines, the compression ratio for air is 16 to The high compression ratio of air creates high temperatures, which ensures the diesel fuel can self-ignite.
Weight of the engines : In CI engines the compression ratio is higher, which produces high pressures inside the engine. Hence CI engines are heavier than SI engines. Speed achieved by the engine : Petrol or SI engines are lightweight, and the fuel is homogeneously burned, hence achieving very high speeds. CI engines are heavier and the fuel is burned heterogeneously, hence producing lower speeds. Thermal efficiency of the engine : In the case of CI engines the value of compression ratio is higher; hence these engines have the potential to achieve higher thermal efficiency.
High pressure is generated after combustion. Constant parameter during cycle. Production of hydrocarbon. Less Hydrocarbon is produced. More hydrocarbon is produced. The starting of SI engine is easy.
The starting of CI engine is difficult. Volume to power ratio. It is used in light commercial vehicles like motorcycle, cars etc. It is used in heavy duty vehicles likes bus, trucks, ships etc. If you have any confusion related to that then feel free to ask through your comments. If you find it informative or useful than share it for others. Related Posts: What is Heat Exchanger? What are the Main Parts of an Automobile Engine?
How Jet Engine Works? Leave a Comment Cancel Reply Your email address will not be published. Fuel used. Petrol is used as fuel. Diesel is used as fuel. Operating cycle. Compression ratio. Low compression ratio. Thermal efficiency. High thermal efficiency. Less thermal efficiency. Method of ignition. Engine Speed. The thermal efficiency of a heat engine is the amount of useful work an engine can do based on the amount of heat input. 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.
A 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. Your email address will not be published.
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