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Ignition Coils

Ignition Coil-on-Plug (COP)

The ignition coil converts a low voltage current to high voltage energy that is delivered to the spark plug to ignite the air/fuel mixture within the cylinder. A coil-on-plug is designed to perform the functions of both the ignition coil which creates the spark energy, and the spark plug wire set that is designed to contain and deliver the high voltage energy to the spark plug. Standard and Intermotor Coil-on-Plug assemblies are engineered and tested to meet or exceed OE standards for spark energy, impedance, and durability.

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Coil-on-Plug Breakdown

Coil-on-Plug Testing

We performed an extensive engineering analysis of OE DG500 and DG508 to Standard. The engineers measured winding resistance, inductance and output voltage, spark, energy, waveform peak voltage and ringing, as well as a complete physical and sectioned comparison to OE.

 

WINDING RESISTANCE / INDUCTION AND OUTPUT VOLTAGE / SPARK ENERGY
  Primary Secondary Output Voltage Spark Energy
  Resistance Inductance Resistance Inductance 50pf 60 Hz 60 Hz
Part no. (mohms) (mH) (kohms) (H) (Peak kV) (mV-S) (mJ)
Standard FD-502 492 1.53 5.36 9.59 25.2 3.70 29.6
Standard FD-503 489 1.49 5.28 9.47 25.2 3.74 29.9
Average Standard 491 1.51 5.32 9.53 25.2 3.72 29.8
OE DG500 515 1.63 5.55 8.61 24.4 3.72 29.8
OE DG508 511 1.58 5.50 8.19 24.2 3.69 29.5
Average OE 513 1.61 5.53 8.40 24.3 3.71 29.7
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The Findings

Standard Ignition Coils look, fit and perform like the original they replace with 100% end of the line production testing. The Standard coils also provide an improved secondary winding design (additional winding bays) that helps prevent internal arcing and high-voltage breakdown.

  • The Standard coils tested 3.7% higher than OE in output voltage.
  • The Standard coils were equal to OE in spark energy.
  • In waveform testing, Standard coils’ peak output voltage was about 1000 volts higher than OE.
  • The Standard coils had a longer spark duration than the OE, resulting in more energy supplied to the spark plugs.

The Standard coils match or exceed the OE coils in all categories and are an excellent replacement exceeding the OE performance.

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Pencil Coils

As engine technology evolves, coil-on-plug technology will continue to play an increasingly important part of ignition systems. One such technology is the pencil coil. Standard and Intermotor are leading the way with quality parts and exceptional coverage for this growing category. Take our UF242 Ignition Coil for example:

Tech Tip: If there’s been a failure such as a short, we recommend replacing the spark plug while you’re replacing the pencil coil.

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    Silicone rubber boot withstands extreme heat and provides superior insulation

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    Stainless steel spring resists corrosion

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    Primary and secondary bobbins made from fiberglass-reinforced polyethylene terephthalate prevent voltage flashover for extended service life

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    Internal core made from grainoriented electrical steel limits loss factor within magnetic circuit to reduce heat that may affect coil endurance

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    External core made from oriented silicon steel for durability

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    Neodymium magnet produces max high voltage output at all speeds

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    Electronic ignition module profile and feedback signal matches fit, form, and function of original

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    Tin-plated brass terminals improve electrical contact and protect against corrosion