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A cold temperature limit of -18Â°C (0Â°F) for unlimited contact with all materials was added. The new hot temperature limits were based on Air Standard 61-39 [2], which in turn was based on Stoll, Chianta, and Piergallini's [3] curve-fit equation to their human testing data.
The insulator nose length is the distance from the firing tip of the insulator to the point where insulator meets the metal shell. Since the insulator tip is the hottest part of the spark plug, the tip temperature is a primary factor in pre-ignition and fouling. Whether the spark plugs are fitted in a lawnmower, boat, or a race car, the spark plug tip temperature must remain between 500C-850Â°C. If the tip temperature is lower than 500Â°C, the insulator area surrounding the center electrode will not be hot enough to burn off carbon and combustion chamber deposits.