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.