Wire Set and Coil on Plug Boot Installation
NGK WIRE SETS
NGK Wire Sets are built to meet stringent OEM tolerances for a variety of vehicles. They utilize a construction method known as "variable pitch" wire winding to create resistance to radio frequency interference. The variable pitch winding (loose/tight/loose) provides suppression throughout a very wide range by "scrambling" and breaking up the electrical waves radiated by the firing of the spark plugs.
A ferrite magnetic layer, consisting of a mixture of rubber, plastic and powdered ferrite magnetic materials, offers uniform resistance and unsurpassed conductivity. NGK wires have a lower resistance than conventional carbon core wires (8k ohm/meter vs. 16k ohm/meter). This comparison is important to remember when you consider that many manufacturers recommend wires be replaced when the resistance exceeds 20k ohm/meter. This does not leave much margin for wear when the wire may only meet original standards at the very early stages of its life.
At the center of NGK Resistor Spark Plug Wire Sets is a fiberglass stranded core, made from the same family of materials used in bulletproof vests. This core greatly enhances the overall strength of the wire, providing a superstrength backbone on which the various layers of the wire assembly are formed. The core gives protection from damage caused by the pulling strains that wires are often subjected to and that can destroy their performance.
High-quality EPDM and silicone coverings are used to resist high heat, oil and chemical damage for increased durability.
Custom-designed terminal boots are always used to provide exact fit (not universal fit like other major wire manufacturers). Each NGK ignition wire is fitted with a positive-locking, corrosion-resistant stainless steel terminal end for tight fit and maximum resistance to vibration and separation.
NGK Wire Sets are numbered for easy cylinder identification and coil wires are color coded for correct and easy installation.
Wire Sets Basics
NGK variable pitch resistor cables provide uniform resistance and ensure outstanding electrical conductivity in high-quality cables. This produces the impedance necessary to suppress radio interference throughout the entire frequency spectrum.
The radio-frequency interference (RFI) noise is generated by ignition systems and can interfere with computer controls and on-board electronic systems of late-model vehicles. When used in combination with resistor spark plugs, NGK resistor cables provide exceptional noise suppression without negatively affecting engine performance.
A layer of ferrite magnetic material wrapped with variable pitch metal wire covers the fiberglass strand core. The inner layer of insulation is made of polyvinyl chloride, with a heat resistance of 100°C. The outer jacket is made of one of two materials, depending upon the application. These materials are:
Ethylene propylene diene monomer (EPDM) is a rubber compound that is heat resistant to 180°C
NGK's new silicone vinyl insulation that is heat resistant to 250°C
NGK cable resistance is only a fraction of that found in ordinary solid carbon core resistor cables. Ordinary solid carbon core wires, used as original equipment on most Japanese vehicles, are not as efficient and effective.
In addition, the resistance of solid carbon core wires tends to increase over a period of time, while the resistance of NGK's wire-wound cables remain virtually unchanged. While resistance is necessary to suppress RFI, too much resistance reduces sparking and ignition energy.
NGK resistor cables are packaged in sets consisting of one coil wire (where applicable), and four, five or six plug wires, as appropriate. Every set is tailored to the right cable length for the exact make and model specified