NGK ignition leads are a key element in the ignition system of many petrol engines. They connect the ignition coil to the spark plug. NGK SPARK PLUG offers ignitions leads and caps that perfectly complement its wide range of spark plugs and ignition coils.
Up to 1,000 ignition leads available
More than 92% coverage of vehicles in operation (source: TecDoc)
High-protection insulation against chemical and electrical environments
Withstand highly demanding conditions
Copper core ignition leads with interference suppression are comprised of a copper core. This is surrounded by a silicone layer that serves as an electrical insulator. Copper is an excellent conductor, but is also very sensitive to corrosion. Therefore, the copper core of such ignition cables is tin-plated. The outer insulation, made of silicone rubber, can withstand temperatures up to 220°C and is resistant to gas and oil.
Carbon resistor ignition leads are comprised of a fiberglass core with a silicone interior insulation. There is a coal-impregnated braided fiberglass inside a carbon resistor ignition cable. For carbon resistor ignition cables, the interference suppression resistance depends on the wire length. It can be calculated on NGK SPARK PLUG's TekniWiki website.
Ignition leads with inductive resistors are surrounded by two silicone layers and fiberglass fabric. Like carbon resistor ignition leads, these ignition cables have a fiberglass core. The inner insulation made of silicone provides for stability and protects against high ignition voltages. The interference suppression resistance can be calculated on NGK SPARK PLUG's TekniWiki website.
This video explains how to correctly assign the ignition leads on 4 cylinder block coils.