Originally posted by THE DOCTOR
I usually ran a cold plug because I was told that they don"t go bad very often. Is that true? Or will most plugs last a long time as long as you don't run the engine to lean?
A cold plug are not always good. When the plug is too cold you may over lean your engine for getting the same power. Then your engine wears faster.
Saw many people just used to choice the coldest plug because they thought it should be the same as real car. The real car tuner rise the compression or add turbo's barometric,so they need to delay the ignition timing.
In my opinion,more hot plug let the ignition more fully. It means more power. Only when the ignition timing is too advance then you need to choice a colder plug. Otherwise I will choice the hottest plug that I can use.