Answer / Mr Sambhu Kumar

In a spark-ignition (SI) engine, the spark plug provides the spark that ignites the air-fuel mixture. Cold and hot spark plugs differ in terms of the gap between the center electrode and ground electrode and their heat range. A cold spark plug has a larger gap and is designed for easier starting in cold weather conditions, while a hot spark plug has a smaller gap and is optimized for high-temperature operation during normal driving conditions. Cold spark plugs are typically used during engine startup in colder temperatures to ensure easy ignition, while hot spark plugs are used during regular operation when the engine temperature is warm. The proper use of cold or hot spark plugs depends on the engine's design and operating conditions.

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