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stratified charge engine

or stratified-charge engine

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noun
  1. 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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Origin of stratified charge engine

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018