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On 9 Jun 2005 at 14:03, Toby Erkson wrote: > I disagree: Preignition is when the fuel mixture starts burning before > it should, either by something else hot w/in the combustion chamber or > by compression, whereas detonation is the explosive burning of the fuel > mixture instead of the normal (slower) burning of the fuel. It doesn't sound to me like we disagree on anything. Preignition is just a generic term that applies to any combustion that occurs before the spark for any reason. Regardless of the cause, early ignition generally results in a explosive, rather than controlled, burn, which can be damaging to an engine. Someone else mentioned ping. That's the 4th term that can mean the same thing as knock, detonation, the compression-caused form of preignition. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~