What spark plugs are you currently using?

[Werner]

Originally Posted by rfitzpatrick

What does it mean when you said they're to hot/cold plz. I really don't understand.
Thanks

Internal combustion engines run at different temperatures. If more specific power, the combustion chamber gets hoter temperature. (Very simplified explanation.)

Simply explained: The hotter engine burns needs the colder the ignition plugs must be. (This interpretation is unfortunately not uniform; in Japan, the standard designation, for example, vice versa. I do not know USA.

Rule of thumb: Hot engine need 'cold' plug. Cold engine 'hot' plug.

For me, the global standardization of of the interpretatin "a plug is hot or cold" is difficult to explain.


If the spark plug does not get hot enough, it will become sooty. If it overheats, there is dangerous high speed knocking!