Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
from The Century Dictionary.
- noun 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.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Engin.) Ignition in an internal-combustion engine while the inlet valve is open or before compression is completed.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun automotive The premature
detonation of a fuel charge in Four-stroke cycle engines.
Etymologies
Sorry, no etymologies found.
Support
Help support Wordnik (and make this page ad-free) by adopting the word preignition.
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 2009
-
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 2009
-
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.
Essential Guide to Business Style and Usage PAUL R. MARTIN 2002
-
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.
Essential Guide to Business Style and Usage PAUL R. MARTIN 2002
-
Under those conditions, the engine is generating a lot more heat and I would expect preignition to be more likely.
The Truth About Cars 2010
-
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
Ask MetaFilter 2008
-
Octane, at the root, is the resistance of a gasoline fuel to preignition, aka "knock".
Ask MetaFilter 2008
Comments
Log in or sign up to get involved in the conversation. It's quick and easy.