What happens when you run too hot of a spark plug?

Will a hotter spark plug stop fouling?

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.

Does spark plug heat range affect performance?

Choosing the right heat range is crucial for high performance engines. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. If it the heat range is too hot, your engine could experience detonation, pre-ignition, or power loss.

Why does my spark plug keep fouling?

Some common causes of spark plug fouling include: Worn or damaged valve guides or valve guide seals. … Oil will form heavy black wet oily deposits on the spark plugs. Worn or damaged piston rings, or worn or damaged engine cylinders.

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.

IT IS INTERESTING:  Your question: How do you tell if a Chevy motor is a 350?

When should I run my spark plugs colder?

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.

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.