"HeyBub" wrote in message
...
ian field wrote:

Somewhere I have a really small spark plug that I drilled the HT stub
so it could be used as a key fob ornament, not sure what size it is
but its really tiny - its for a Honda portable generator.

They make even smaller ones, tiny really, for model airplanes.


The only ones I've seen myself are glowplugs which have a tiny coil of wire
up the end which can be heated with a LV battery for starting, after which
the combustion itself keeps it hot.