Frequent question: When should you use a hotter spark plug?

Do hotter spark plugs make a difference?

By examining “hotter” and “cooler” spark plugs of the same manufacturer side by side, the principle involved can be very clearly seen; the cooler plugs have more substantial ceramic insulators filling the gap between the center electrode and the shell, effectively carrying off the heat, while the hotter plugs have less

When should you run a hotter spark plug?

If it the heat range is too hot, your engine could experience detonation, pre-ignition, or power loss. Most spark plug manufacturers recommend that the tip temperature remain between 500° C and 850° C.

Do I need a hotter or colder spark plug?

For NGK, Denso and Pulstar, the higher the number, the colder the plug. … When making spark plug heat range changes, it is better to err on the side of too cold a plug. Running too cold a plug can only cause it to foul out, whereas running too hot a plug can cause severe engine damage.

Why use a hotter or colder spark plug?

Rich air/fuel ratios require a hotter plug to prevent fouling. Mixtures that cause the plugs to read lean may contribute to pre-ignition or detonation. … The higher the compression ratio, the colder the spark plug needs to be.

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How do I know if I need colder spark plugs?

A colder heat range spark plug may be necessary if the ignition timing has been advanced to near the knock level. Higher cylinder temperatures near the knock level will bring the spark plug firing end temperature closer to the pre-ignition range.

How do I choose a hotter spark plug?

The higher the number, the hotter the plug. The lower the number, the colder the plug. Starting with part # 24 (heat range 4), if you want a colder plug you would use part # 23 (heat range 3), for a hotter plug you would use part # 25 (heat range 5).

Does spark plug gap affect timing?

The first effective parameter in sparking system would be the spark plug gap. Spark plug gap is a main factor affecting the performance of the engine depending on the engine structure. … Maximum power values were obtained at 0.75 mm spark plug gap for both ignition timing values of 11°and 15°CA BTDC.