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Ignition coils in the ignition systems of modern cars generate voltages of up to 45,000 V. It is essential that misfiring – and as a consequence incomplete combustion – is avoided. It is not only that the vehicles' catalytic converter could be damaged. Incomplete combustion also increases emissions and thus envi-ronmental pollution.
There is a fairly typical range for the turns ratio of ignition coils, generally between perhaps 50:1 to 200:1, with 100:1 probably being the most common. Measurements that indicate a turns ratio significantly outside of this range may indicate an error in measurement or a damaged coil.
Ignition coils in the ignition systems of modern cars generate voltages of up to 45,000 V. It is essential that misfiring – and as a consequence incomplete combustion – is avoided. It is not only that the vehicles' catalytic converter could be damaged. Incomplete combustion also increases emissions and thus environmental pollution.
This is a tool for establishing a baseline spark advance table for your tuning efforts with MegaSquirt® or MicroSquirt® controllers. It is designed to work in Mozilla Firefox 6.0, though it may work with other browsers. It is based on the 'rules of thumb' presented here: Making a Spark Advance Table.
Depending on the ignition system and ignition coil design, the following reference values apply: (observe the manufacturer's specifications) Cylinder ignition coil (transistor ignition system) Primary: 0.5 Ω – 2.0 Ω/Secondary: 8.0 kΩ–19.0 kΩ
On this page you can find out how ignition coils work and which designs are used in the latest generation of vehicles, for example. You will also find a wealth of practical tips for diagnostics and checks on ignition coils.
Let’s first begin with the basics of an ignition coil. The ignition coil works similarly to a transformer where lower voltage is converted to the much higher voltage needed to fire a spark plug. This is achieved by what is commonly referred to as coil turn ratio.
