Compare the SI and CI engine on the basis of: (i) Compression Ratio (ii) Operating Speed (iii) Power O/P per weight.

Compare the SI and CI engine on the basis of: (i) Compression Ratio (ii) Operating Speed (iii) Power O/P per weight.
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1 Answer

Answer :

Parameter
SI Engine
CI Engine
(i) Compression Ratio
Compression ratio is low, about 10:1 limited by detonation
Compression ratio is higher, about 18:1 to 22:1
(ii) Operating Speed 
To avoid Detonation in SI Engine operating speed is High
To avoid Diesel knock operating speed is Low 
(iii) Power O/P per weight.
Power output is Less than CI engine due to lower compression ratio.
Power output is more than SI engine due to higher compression ratio.
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