Quick Answer: Why Do Spark Plugs Melt?

What could cause a spark plug to melt?

A melted electrode on your spark plugs means that they’ve been running too hot for too long and could burn a hole through the top of a piston.

A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture..

Do spark plugs break down when hot?

When the heat rating is too low: The spark plug temperature rises too high and induces abnormal combustion (pre-ignition): this leads to melting of the spark plug electrodes as well as piston seizure and erosion.

How do you read a jetting spark plug?

Base ring inspection is used to determine proper jetting. As a spark plug is used, a certain amount of residue collects on the base of the plug and the residue should cover at least 7/8 of the way around the base ring. Too little indicates lean jetting while excessive build up indicates rich conditions.

What does black soot on spark plugs mean?

Black, dry soot on the electrodes and insulator tip indicates a carbon-fouled plug. This can be caused by a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture or idling your vehicle for too long.

What does the Y mean on a spark plug?

The letter “Y” indicates a V-grooved center electrode. The number after the – indicates the recommended spark plug gap in tenths of a millimeter.

Which is better a resistor or non resistor spark plug?

Since resistor type plugs actually “resist” some of the spark energy, non-resistor type plugs actually deliver a more powerful spark. … Use of non-resistor plugs in vehicles that call for a resistor type can result in rough idling, high-rpm misfire, and abnormal combustion.

Are Iridium plugs better than platinum?

Iridium is said to be six times harder and eight times stronger than platinum with a 700° higher melting point. … Thanks to its strength, iridium spark plugs can last up to 25% longer than comparable platinum spark plugs.

What happens if I use a colder spark plug?

The colder type removes heat more quickly, and will reduce the chance of pre-ignition/detonation and melting or damage to the firing end. (Engine temperature can affect the spark plug’s operating temperature, but not the spark plug’s heat range).

Do I need a hotter or colder spark 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.

How do you read a lean or rich spark plug?

Spark Plug Indicators By Fuel The longer the period of use, the darker the color. A rich mixture results in a dark porcelain coloration from carbon buildup. The darker the color, the richer the mixture is. A lean mixture can be indicated by excessive heat indicators on the plug and ground strap.

Which NGK plug is hotter?

NGK plugs are colder the higher the number, hotter the lower the number. Starting with part # BKR6E-11 (heat range 6), a colder plug would # BKR7E-11 (heat range 7), a hotter plug would be # BKR5E-11 (heat range 5). For NGK Racing Plugs, the heat range is located AFTER the hyphen.

Do spark plugs add horsepower?

In short, yes, in some situations spark plugs can increase horsepower. … The theory behind spark plugs increasing horsepower is that by providing more spark to the firing tip of the spark plug, it will (and does) combust more fuel.

Why would you use a hotter 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.

What does a spark plug look like when running lean?

A common symptom of your car running lean is that your spark plugs are clean or turn white. Spark plugs are generally a brown or grey color, which is caused by normal ignition.

What are the best performance spark plugs?

NGK 6619 Iridium IX Spark Plugs snagged the top pick in our spark plug comparison because they offered the best mix of high-performance, fuel efficiency, durability, and dependability. Featuring an iridium construction, these high-quality spark plugs provide a longer lifespan than copper and platinum spark plugs.

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

The most serious result of selecting a heat range that is too hot is overheating. Overheating will cause the electrodes to wear quickly and can lead to pre-ignition. … When the spark plug firing end (tip) temperature exceeds 800°C, pre-ignition originating from the overheated insulator ceramic can occur.

What is the difference between hot and cold spark plug?

*When a spark plug is referred to as a “cold plug”, it is one that transfers heat rapidly from the firing tip into the engine head, keeping the firing tip cooler. *A “hot plug” has a much slower rate of heat transfer, which keeps the firing tip hotter.

What does 1 step colder spark plugs mean?

A modified engine with higher cylinder temperatures will usually need a colder heat range spark plug. Generally, for every 75-100 hp you add, you should use a one (1) step colder heat range to be safe and avoid pre-ignition. The plug gap may also need to be adjusted smaller to avoid misfire.

Do performance spark plugs make a difference?

This would be more accurately described as “less performance loss.” Spark plugs do not increase the performance of an engine — even spark plug manufacturers are fairly forthright about that. … They won’t make the engine perform better than it did when it was new, but they will help it stay at that level longer.