Rob -
Easy to get confused. If I'm remembering this correctly:
A "hot" plug is designed to transfer heat away from the plug tip more
slowly than a "cold" plug. It retains heat.
Or to put it differently, a "cold" plug will stay cooler at the tip than
a "hot" plug in the same operating conditions. It sheds heat.
The idea is to keep the plug tip at the optimum operational temperature,
without getting it so hot that it starts undergoing violent
decomposition.
(Sheesh, if I've got this backwards, don't slap me around too badly,
OK?)
Chris K.
ckotting@core.com
rob thomas wrote:
>
> Suffering from a bit of confusion here. Do 'hotter' plugs work better for
> an engine that requires a higher heat range or does 'hotter' relate to the
> fact that the engine runs hotter and thus the plugs would seem too hot in a
> standard engine. I know I haven't posed the question very clearly, but I'm
> suffering from early signs of dementia over this.
>
> Now, as to the way the plug heat ranges are marked.....are the numbers (eg
> N9, BP6 etc ) ordered in the opposite ways for NGK and Champion plugs?
> Which ones are equals? If your car gets carbon build up on an otherwise
> correct engine (ignoring any other cause of carbon deposits :o} ), would
> you go for a 'colder' plug to get more heat build-up on the electrode or a
> 'hotter' one?
>
> Yours sincerely,
>
> Confused of Cymru.
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