Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. The ignition of fuel in an internal-combustion engine before the spark passes through the fuel, resulting from a hot spot in the cylinder or from too great a compression ratio for the fuel.
Century Dictionary and Cyclopedia
- n. An ignition of the combustible charge of fuel and air in an internal-combustion engine before the piston, on its compressing stroke, has reached the inner dead-center, or completed the normal compression of the charge. See ignition, 5.
Wiktionary
- n. automotive The premature detonation of a fuel charge in Four-stroke cycle engines.
GNU Webster's 1913
- n. (Engin.) Ignition in an internal-combustion engine while the inlet valve is open or before compression is completed.
Examples
“But, to overcome preignition you can inject water or adjust the fuel or higher octane or a combination thereof but there is also the compression ratio to consider.”
Remember $4.00 per Gallon Gasoline? Just Wait. - Vladimir’s blog - RedState
“However too much advancement is preignition that will increase cylinder pressure to the point of depositing the bottom end in to the pavement.”
Remember $4.00 per Gallon Gasoline? Just Wait. - Vladimir’s blog - RedState
“After taking lead out of the gasoline the compression ratios had to be dropped to 8 and 9 to 1 in order to avoid preignition igniting of the fuel which the lead was in there to prevent.”
“It is a measure, on a scale 1 to 100, of the resistance of a fuel, usually gasoline, to preignition or knocking in an internal combustion engine.”
Simon & Schuster: Essential Guide to Business Style and Usage
“Under those conditions, the engine is generating a lot more heat and I would expect preignition to be more likely.”
“However, because of ethanol's resistance to preignition, it should be theoretically possible to design an engine with a much higher compression ratio, which could then extract more useful work from the ethanol.”
“The reason for premium: higher octane fuel has a higher threshold for preignition”
“Octane, at the root, is the resistance of a gasoline fuel to preignition, aka "knock".”
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