[T3] Spark Plug Cleaner

[Jim Adney]

On 20 Jun 2011 at 22:37, Bryon Garvin wrote:

> My sense of it has been that they clean themselves if the engine is running
> properly.

That's correct. There's a "self cleaning" temperature range where you 
want your plugs to operate. If they run cooler than that they 
accumulate carbon, etc; if they run hotter than that they will be 
damaged. Plugs are available in different "heat ranges" to allow 
automakers to choose a version that runs at the right temperature in 
their engine.  

It's the temperature of the insulator, the portion next to the spark 
gap, that we're concerned with here.

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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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