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Spark Plugs


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92 Items Found
Model dependent product

Spark Plug NGK MAR8B-JDS

£ 9.89 *
Universal product

Spark Plug NGK B5ES

£ 2.75 *
Universal product

Spark Plug NGK B5HS

£ 2.65 *
Model dependent product

Spark Plug NGK B6ES

£ 2.50 *
Model dependent product

Spark Plug NGK B6HS

£ 2.68 *
Model dependent product

Spark Plug NGK B7ES

£ 2.62 *
Model dependent product

Spark Plug NGK B7HS

£ 2.62 *
Model dependent product

Spark Plug NGK B8HS

£ 2.62 *
Universal product

Spark Plug NGK B9EG

£ 6.83 *

NGK spark plugs


The spark plug range from NGK includes many different types of spark plugs:
From standard spark plugs to precious metal spark plugs to double precious metal spark plugs.
For many engines, NGK offers the optimal solution, as original equipment manufacturer for leading car and motorcycle manufacturers, in the winning Formula 1 vehicles, in motorcycle racing and in everyday road traffic.
The main manufacturers of two-wheelers, small engines and marine engines also rely on spark plugs from NGK. The NGK product range offers the right product for almost every engine.

Noble metal spark plugs have very specific characteristics in terms of life and performance.
Spark plugs with V notch in the center electrode ignite closer to the ignitable mixture.
V-Line and LPG LaserLine - Perfect for repair service and efficient work.
LPG LaserLine is a special spark plug range for gas powered engines.

function



There has been no profound change in the basic design of the spark plug over the past 50 years.
The spark plug consists of a metal core housed in a ceramic insulator.
This is surrounded by a metal shell, which consists of a thread that is rotated in the cylinder head and usually has a hexagonal area at the top,
to allow the installation or removal of the spark plugs.
At high voltage on the spark plug to jump a spark from the center electrode to the ground electrode.


Requirements for spark plugs


If a gasoline engine is to run properly, the spark must be reliably controlled.
Misfiring causes unburned air-fuel mixture enters the exhaust and burns there only within the hot catalyst. In order to damage the catalyst or even render it completely unusable may be a few misfires.
Considering that a spark plug must ignite between 500 and 3500 times per minute, it becomes clear how great the contribution of modern spark plug technology is, for example, to compliance with current emission standards and to reducing fuel consumption.
Also, the expectations in the life of a spark plug have become much higher in recent years.
The conditions have become more difficult due to new, more efficient and more powerful engines, but have been solved by constant development, research and new, better materials.

Installation of spark plugs



Replacing the spark plugs is one of the simpler jobs for the car owner with good accessibility, and there are a few things to consider.

For modern vehicles it is important to have the right tools. Otherwise there is a risk of damaging the spark plugs when screwing them out or in.

In the case of engines equipped with aluminum cylinder heads, the aluminum expands more when heated than the spark plug, thereby damaging the spark plug. Therefore, a spark plug should be changed only when the engine has cooled down.

A torque wrench is required to install a spark plug. The prescribed tightening torque of the spark plug must be observed.

A wrong tightening torque can lead to spark plug failures. Too low, then threaten compression losses and overheating. Also, an insulator breakage or breakage of the center electrode due to vibration is conceivable.

Torque too high, it may cause the spark plug to break off. The case may stretch or twist. The heat drainage zones are disturbed. Overheating and fusion of the electrodes up to the engine damage can be the result.

Standard values ??are 20-30 Nm for aluminum heads and 18 mm spark plug threads. With 14 mm thread 10-20 Nm. (Note the manufacturer's instructions)


Quick Installation Guide for Spark Plugs



Loosen the old spark plug.
Before removing, remove any encrustations and dirt from the installation compartment with compressed air.
Unscrew old spark plug.
Clean spark plug hole.
Screw in new spark plug by hand.
Do not use spark plugs that have fallen on a hard surface.
Tighten spark plug to specified torque.


Damage to spark plugs:



Normal appearance of a used spark plug:
An intact spark plug has a white-gray discoloration.
It comes from fuel additives that do not burn completely and is the result of a controlled, normal combustion.

deposits



Heavy deposits can be caused by poor fuel quality and by burning oil or coolant on faulty or worn engines. The deposits smolder and cause misfire, which can lead to insulator breakage and engine damage.
Insulator breakages are also often caused by incorrect torque or insulators being damaged before assembly.
When a spark plug overheats, the center and ground electrodes melt together.


merger



When a spark plug overheats, the center and ground electrodes may melt together.
In such cases, a possible melting of the piston can not be ruled out.
The causes can be the wrong spark plug (wrong heat value) or a defect of the engine (knocking combustion or glow ignition).

sooting



Frequent short-distance operation or incorrect (too cold) heat value of the spark plug can cause sooting. The spark plug will not reach its self-cleaning temperature of 450 ° C.