lean burn
Technical term for an internal combustion engine strategy that uses a lean air-fuel mixture to improve fuel efficiency and reduce emissions. Often contrasted with stoichiometric combustion.
See also: リーンバーン
Lean-burn engines have good fuel economy.
This car uses lean-burn technology.
Katakana loanword for 'lean burn', used interchangeably with 希薄燃焼 in technical contexts.
Compound of 希薄 (きはく, 'dilute, thin') and 燃焼 (ねんしょう, 'combustion'), directly translating the English term 'lean burn'.