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Spiro-Core "MAG" wire
for European Ignition Systems

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Why do Ignition leads have resistance?

Ignition Cable Sets have resistance to prevent radio frequency noise from interfering with radios, cellular telephones, computers and other onboard electronic equipment. European ignition systems are designed around exact OHM and Voltage values to provide the optimum balance between

1) Maximum Fuel Efficiency 3) Minimum Radio Frequency Noise
2) Maximum Engine Power

4) Minimum amount of harmful
in the exhaust

Each lead in a European wire set must have the exact same resistance +/- 10% of a specific value which is unique to the Ignition System. Since each lead of a wire set has a different length, this can only be achieved by using copper wire (no resistance) with specific value resistorized ends. STI makes European wire sets according to O.E. drawings with 19-strands of tinned copper wire and exact resistorized ends. The correct resistance values can not be achieved with Spiro-Core wire!

 What is Spiro-Core Wire?

Spiro-Core is an upgrade from basic resistor wire. It is made by wrapping a thin metal strand around a non-metallic core. This reduces the resistance in the wire from somewhere between 3000-7000 OHMS per Foot in basic resistor wire to under 1000 OHMS per Foot, while still being able to prevent a good amount of Radio Frequency Noise. This wire was designed for applications whose performance is not based on exact ohm values like most American and Japanese applications.  The resistance is built into the wire and the overall resistance varies proportionally to the length of the wire.

 Why would anyone make a European wire set with Spiro-Core Wire?

 A) O.E. Resistorized connectors are expensive and there are many different types that are needed if you plan to offer an entire wire set line. Some manufacturers try to circumvent this by replacing the O.E. connectors with hollow look-a-like non-resistorized connectors. Then they use Spiro-Core wire to try to make up for some of the lost resistance. What the purchaser of such a set does not see is that while they may be paying less for a set that looks like the real thing, they just sacrificed the performance of their "European driving machine".

B) Manufacturers of such gimmick devices as multi-spark ignition, high energy coils etc. are trying
to tell the public that they are smarter than the European engineers. While proof of their claims is suspect, one thing is for sure. If you use an O.E. type wire set with their high energy gadgets, you
will ruin the O.E. resistorized connectors. Knowing this, these manufacturers must use hollow
non-resistorized connectors. Then they use Spiro-Core wire to try to make up for some of the lost resistance.

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