[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
On 2 Sep 98, at 15:06, king5zreo@juno.com wrote: > As for the hot plugs, this doesn't > have anything to do with the engine temperature, only the the spark from > the plug that fires within the cylinder, is hot. That is to say the spark > is hot. This is a common misconception. The spark is always the same "temp." What changes is the temp of the insulator near the tip. If the insulator runs too cool then stuff condenses out on it and this will eventually short out the spark. If the insulator runs too hot it can actually be damaged by the heat, or it can cause preignition of the mixture. There is a range of temps referred to as the "self-cleaning" temperature range where the plug will survive and yet the insulator will stay clean enough to continue to insulate. If you work your engine hard you will need to run a "cooler" plug, or if it idles all day you will have to run a hotter plug. All this is done to actually get the insulator to stay at the SAME temp. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe