Discussion
Which temperature range should a plug tip operate within?
Answer: D
Below about 500 degrees the plug fouls and above about 850 it causes pre-ignition, so the working window lies between. Those figures are why heat range must match the engine and its duty. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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