Compression Ignition (C.I.) Engines
The operation of C.I. engines (or diesel engines) is practically the same as those of S.I. engines. The cycle in both the types, consists of suction, compression, ignition, expansion and exhaust. However, the combustion process in a C.I. engine is different from that of a S.I. engine as given below:
In C.I. engine, only air is sucked during the stroke and the fuel is injected in the cylinder near the end of the compression stroke. Since the compression ratio is very high (between 14 : 1 to 22 : 1), the temperature of the air after compression is quite high. So when fuel is injected in the form of a spray at this stage, it ignites and burns almost as soon as it is introduced. The burnt gases are expanded and exhausted in the same way as is done in a S.I. engine.
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