An ignition coil – also known as a spark coil – is an essential component of a petrol vehicle’s engine. Without an ignition coil, there is no spark; and without a spark, there is no combustion. It may seem like a small component, but it plays a major role in keeping your engine running.
What exactly does an ignition coil do?
The ignition coil converts the low voltage from the battery (12V) into a high voltage (up to 40,000 volts). This high voltage is needed to create a strong spark at the spark plug, which ignites the fuel-air mixture in the cylinder.
Each cylinder in your engine has its own spark plug, and in modern engines often its own ignition coil as well.
How does it work?
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The ECU (engine control unit) sends a signal to the ignition coil.
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The coil builds up a magnetic field.
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This field collapses, converting low voltage into high voltage.
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That voltage goes to the spark plug, which produces a spark.
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Combustion begins – and the engine delivers power.
This process occurs several times per second per cylinder, and must be precisely timed and reliable.
What if the ignition coil isn’t working properly?
A faulty ignition coil can lead to:
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Poor engine performance
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Stuttering or hesitation
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Loss of power
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Unburned fuel in the exhaust
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Long-term engine damage
That is why it is important to use good-quality ignition coils – especially in tuned engines or under heavy loads.
Advice from JT Products
At JT Products, you’ll find reliable ignition coils for every type of engine – standard, sports or tuned. We’re happy to advise you on the right parts, tailored to your engine and riding style.
