Gasoline engine obtain power by compressing fuel/ air mixture of air and gasoline, and exploding this mixture by ignition.

Spark plug serves to ignite this fuel/air mixture.

With the battery as the power source, the spark plug converts the electrode energy that comes through the ignition coil and distributes into a spark which ignites the fuel/air mixture.

In other words, without the spark plug, the engine doesn’t run; the spark plug is an important part because its performance influences the overall performance of the engine.

When the high voltage generated by an igniter is applied on the center electrode and the ground electrode, electrical spark is produced, because the insulator between the electrodes is broken resulting in discharge there. This spark energy can fire compressed air/fuel mixture.

This process is conducted so rapidly (1/1000 seconds).

The role of the plug is to ignite the air/fuel mixture to turn it into work while accuracy and powerful sparks are required.

Ignition produced by electrical sparks result due to particles existing in the spark gap become activated which leads to chemical reaction bringing about flame kernel. This reaction is generally bigger and bigger in the spark gap.

However, when quenching effect is bigger than the heat generation, which turn out misfiring, a wider spark gap can be expected to generate powerful ignition, because the flame kernel can develop bigger in the wider spark gap and the quenching effect become less.

However this setting requires larger discharge voltage which is over the limit of a coil ability just leading to misfire.

3. Types of spark plugs available

Nickel Standard Spark Plug
Iridium Spark Plug
	Iridium Power	Iridium Racing	Iridium Tough
TT Spark Plug
	Nickel TT	Platinum TT	Iridium TT