1. Is it cheapness?
2. Is it to prevent heat cracking from expansion/contraction? If so, then why not handle that issue with concentric sleeve on electrode?
3. That spring would seem to depart the characteristics of that plug to lesser? That spring does not seem to have same heat characteristics? Is that how, in part, a mfg configures the heat index of a plug?
4. Does it have some "resister" function to the plug?
5. It defies examination of the plug, without having to destroy it?
6. Springs fail sooner with heat. And plugs are hot.
7. Is it meant to 'cap' how hot the iridium electrode can become? In theory preventing preignition?
8. Does that expansion contraction of spring create a gas effect that causes bypass though ceramic tightness seal of the plug? It isn't gas filled/ sealed, or they would advertise that? So you have a spring heated chamber, not a vacuum chamber either?
9. Back to 1. If you ran iridium from tip to tip... could it be done? Expensive metal? Bug would it be ideal?
And indeed I don't know if they are all like that. If the ones in cars are like that I shouldn't question, because they last a long time?
Which brings me to the next point, what is the spring failure rate?
Perhaps there is a very simple answer?
© 2023 Thomas Paul Murphy
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