
A stratified charge engine is a type of internal combustion engine, used in automobiles, in which the fuel is injected into the cylinder just before ignition. This allows for higher compression ratios without `knock,` and leaner air/fuel ratio than in conventional internal combustion engines. Conventionally, a four-stroke (petrol or gasoline) Ot.....
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http://en.wikipedia.org/wiki/Stratified_charge_engine

an internal-combustion engine in which a small charge of a rich fuel mixture is ignited first and used to improve combustion of a larger charge of a lean fuel mixture.
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https://www.infoplease.com/dictionary/stratified-charge-engine
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