- A condition in the fuel-metering system in which the fuel-air mixture is leaned out, or deriched, when antidetonation injection fluid is injected into the engine. If this is not done, the mixture would be enriched by the antidetonation fluid, and the engine might not develop its maximum power.
Aviation dictionary. 2014.
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Water injection (engines) — In internal combustion engines, water injection, also known as anti detonant injection, is spraying water into the cylinder or incoming fuel air mixture to cool the combustion chambers of the engine, allowing for greater compression ratios and… … Wikipedia