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I think you have a typographical error in your question. The question I believe is "What is a compression ignition engine?" The answer is:- A diesel engine is a compression ignition engine.
Compression ignition is deisel. Otherwise, spark ignition is gasoline.
The lowest compression ratio of a compression-ignition engine that allows a specific fuel to be ignited by compression ignition.
A 'spark ignition ' engine is your regular gasoline engine as opposed to a diesel, which is a 'compression ignition' engine
compression ignition
Compression ignition engine.
Ignition is accomplished by compression.
Performance, horse power and fuel mileage will suffer.
the diesel engine. it takes one ignition to start, then it runs off of (autoignition) ignition from heat caused by high compression. compression ignition (autoignition) causes ignition to happen a little earlier than spark ignition engines (gas engines) which is less vulnerable to risk of engine knocking or wasted power when dealing with high compression. -maddmatt
a diesel engine uses compression and has no need of spark plugs
S.I Engine lower compression Ratio is 6 to 11
An SI engine ignites the fuel with a spark (SI = Spark Ignition) whereas the CI engine ignites the fuel with heat generated from compression (CI = compression ignition)