Answer / sanjeevi

Spark Ignition Engine
SI engines are high speed engines.
SI engines have low thermal efficiency
SI engine works on otto cycle.
Constant volume cycle.

Compression Ignition Engine
CI engines are low speed engines.
CI engines have high thermal efficiency
CI engine works on diesel cycle.

Answer / brajesh kumar

SI stands for spark ignition .which is generally happened in gasoline(petrol engine).
CI(compression ignition).which generally happened in heavy engine.due to which differ in compression ratio.

Answer / dev

Simply said
Fuel used in SI engine is Petrol (gasoline)
Fuel used in CI engine is Diesel

Answer / hari

simply SI engines are works on otto cycle (during suction stroke Air-Fuel mixture enters into the combustion chamber )

CI engines are works on diesel cycle(during suction stroke only Air enters into the combustion chamber as a working fluid)

this answer is enough

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