10 Best Spark Plugs: Reviews and Buying Guide

Nowadays there is not much talk of spark plugs rich in polonium. However, as a curious detail, we highlight this type of spark plug. Firestone polonium M40 with an alloy of polonium 210 (polonium 210 lasts 138 days) I suppose that later the spark plug would be normal and current.
Spark plugs monoelectrode or multielectrode?
At this point, we started to make some mistakes induced by the brands themselves. If our car has spark plugs from a single pin it is advisable to keep the same type of spark plug.
Let’s talk about spark plugs “multipath” or “multielectrode” (three or four legs) this type of spark plugs do not improve at any time the ignition, the only improvement that offers us is to have a longer duration to distribute the spark continuously between 4 points and obvious a greater flame front.
Any inconvenience regarding the number of electrodes?
Yes, although it is not significant there is. Having 4 pins increases the compression in the engine (however minimal) something not entirely positive considering that it also has a certain delay in the ignition (due to a splitting of the flame in the 4 pins). The only clear advantage is its longer duration.

Top 10 Spark Plugs

Spark plug technologies

From cars and motorcycles to Formula 1 races and motorcycles, NGK SPARK PLUG has established itself as a highly reliable original equipment manufacturer (OEM). With its clear commitment to offer the highest quality and continuously raise the bar, NGK SPARK PLUG is the brand chosen indisputably by the majority of vehicle manufacturers. 

To meet growing expectations, NGK SPARK PLUG regularly invests in research, technology, and development. As a result, the company produces more than 1000 different types of spark plugs for all types of automotive engines, as well as for motorcycles, water vehicles, motorized sports, and many other applications. Therefore, the NGK product range has the right product for almost all engines and all demands.

  • Unique design to ensure the best possible performance
  • Wide range with different thermal grades for high thermal resistance
  • High-performance spark plugs for the latest generation engine technologies

Requirements for spark plugs

As the main source of energy in any gasoline engine, a spark plug performs an essential function: it is responsible for igniting the air-fuel mixture in the combustion chamber of gasoline engines. This combustion process creates energy and, finally, puts the vehicle in motion.

By type of fuel:

Although we assume that the spark plugs are typical of gasoline vehicles, the truth is that we can also find them in other engines under the following conditions:

  • Spark plugs for gas: They usually have the highest ignition voltage, since the mixture for combustion is in these vehicles between air and gas, and is more stable than gasoline. They are coated in nickel to better withstand the temperature and prevent gas corrosion from rapidly wearing the electrodes
  • Spark plugs for diesel: They are incandescent or preheating and consist of heat pipes that are in the cylinder head and point to the combustion chamber to heat the air, being able to overcome the 1000ºC so that the self-ignition of the diesel engines that do not count With direct injection, take place easily even when cold.

According to resistance:

Inside the preheating spark plugs for diesel engines of separate injection, we find them of two kinds:

  • Spark plugs naked resistance: They are traditional and have the electrical resistance exposed, similar to those found in gasoline engines.
  • Protected resistance spark plugs: It is more modern and is covered with a resistant case filled with magnesium oxide that will allow transmitting heat better.
  • Spark plugs of antiparasitic resistance: Some of the spark plugs protected also have inside this type of resistance that is responsible for eliminating possible interference in the electrical system.

By material class:

Depending on the material with which they are processed, we can obtain better yields:

  • Copper spark plugs: These are the conventional ones and those that conduct the electricity better, thus guaranteeing more current flow to the cylinder.
  • Spark plugs platinum or iridium: They are more expensive but can last up to four times more than traditional (about 100,000 kilometers). Their resistance is because they have less conductivity. To compensate for their work, they have a pointed central electrode that optimizes the current jump.

By the screw neck:

When the spark plugs are screwed to the cylinder head they should be flush with the inner surface of the cylinder head. If there was a thread missing or missing, it would be filled with charcoal and would make it difficult to replace it when the time comes. Therefore, depending on the size of the motor head we can find the following classes:

  • Conical seat spark plug: They are thinner and do not require seals as they seal tightly when bolted to the stock.
  • The spark plug of short reach: The length of the thread is smaller. They are only used in thin head motors because the electrodes are so high that the filaments would not reach the combustion chamber.
  • The spark plug of long reach: They are of a long thread and the own ones of thick heads of the motor, otherwise, they would enter too much in the combustion chamber getting to touch the pistons.

For the size of the current arc:

It is the section that runs the spark, jumping from the central electrode to the side. If the erosion of the electrode itself increases the distance, the voltage may be insufficient for the spark to occur. In multi-electrode plugs, always jump to the nearest. If you want to obtain a larger current arc, more open spark plugs are used:

  • Spark plugs of normal opening: They are the simplest. In them, the current arc jumps a space of up to 0.035 inches.
  • Large opening spark plugs: In addition to sufficient space, they require high voltage coils in the ignition system so that the arc can reach up to 0.080 inches.

By a number of electrodes:

In the market, we find spark plugs of between one and four electrodes. The multielectrode offer a more balanced ignition since they alternate and the energy always flows down the path of least resistance, increasing its useful life in a manner directly proportional to the number of electrodes fitted.

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