Spark Ignition Engine: Compression Ignition Engine: 1. The compression ratio is 8-12: 1. Compression ratio is 14-22: 2. Otto cycle : 2. Diesel cycle: 3. A spark plug is used to generate ignition: 3. High-temperature ignition: Air is compressed to a high temperature for ignition: 4. Air and fuel petrol mixture is inserted through a carburetor: 4.. As its name indicates the spark Ignition (SI) engine, 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. Since spark and compressed air is used to ignite the fuel in these engines, so they are called as spark ignition.

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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. Difference between spark ignition and compression ignition Engines: SI & CI Engine work on Otto & Diesel Cycle respectively.. Compression ignition basically is the term that is used for describing the manner in which diesel engines function. It happens when intake air—which often is combined with recirculating exhaust.