Truth and myths about ignition wires
> SELECTION OF IGNITION WIRES
Compared to modern thermoplastics designed over the past few years, silicone insulation is quite defective. Silicone belongs to the materials resistant to recycling. Mechanically is not as strong. That is why silicone wires are reinforced with glass fibre or nylon and usually covered with special casement for protection. This casement has another job to do. They additionally protect the wire set against rodent animals some of which find silicone tasty.
Classes A, B, C, D, E, F are quality classes
Silicone wires E or F class are the highest quality wires
The wire diameter has no effect on the quality of insulation or conduction
Despite all the technological advance the laws of physics remain undefiled and a thicker layer of the same material is always more resistant to rupture than a thinner one. However one must keep in mind that insulatory properties of selected materials tend to be different so one must not reject smaller diameter wires beforehand.
Properly made they may meet car manufacturers’ requirements. If it was not the case all would use 7 millimetre wires not 5 millimetre ones. Another thing is that thin wires are covered by protective casement against outer elements or the metal parts of the engine.
Gas engines require higher temperature resistance wires