Plugs and Wires

In mathmatics there is something called an infinite impulse function. It has an infinite amplitude, for an infitesimal period of time. If a fast Fourier transform is used to analyze the impulse, it contains an infinite spectrum of frequencies. A spark is similar, it has a high amplitude for a short period.

An antenna is a conductor, it radiates RF energy well, if the antenna length is a multiple of half the signal wavelength. So with the various lengths of plug wires, there is an enormous chance the radiated noise will be undesirable at a huge number of frequencies.

That is my story and I am sticking to it. :)

It is one reason why modern ignitions are direct fire, coil on plug, elimating plug wires, and open spark gaps.