[SEL] Spark Plug Stuff

[John Culp]

Teflon tubing was mentioned 7-8 years ago on this list as a workable 
substitute for mica in ignitors. Don't see why that couldn't be made to 
work in a spark plug.

John

On Apr 19, 2006, at 10:28 PM, John Hall wrote:

> If anyone cares to talk engine stuff, I got one for you. I need to 
> rebuild some rather expensive sparkplugs to have for spares. They are 
> built originally using Mica tubes and washers for insulators. Anybody 
> come up with a more modern material you prefer for rebuilding 
> plugs/igniters? I found some machinable ceramic but it ain't cheap!! 
> My biggest concern when choosing an alternative material is that I 
> don't know how much heat I need to withstand. Anybody have any idea 
> how hot it gets inside the combustion chamber of a "working" engine?


John Culp
Bristol, Tennessee, USA