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. Our Coil-on-Plug assemblies are engineered and tested to meet or exceed OE standards for spark energy, impedance, and durability.
A coil-on-plug is designed to perform the functions of the ignition coil (creating the spark energy) and the spark plug wire set (containing and delivering the high voltage energy to the spark plug). To ensure proper function, BWD® and Intermotor® Coil-on-Plug Assemblies feature premium-quality components.
Designed using advanced thermoplastics to ensure proper connection and resist fractures caused by heat and thermal cycling
High-temp boot prevents highvoltage leaks, while stainless steel spring with internal ferrite noise suppressor prevents radio frequency interference (RFI)
High-impact material bonds extremely well to epoxy to ensure longer life in all operating conditions
Internal neodymium permanent magnet surrounded by grainoriented magnetic-laminated steel maximizes high-voltage output at all speeds
Primary (25 gauge) and Secondary (43 gauge) copper wire ensure high-voltage availability for peak performance while reinforced bobbins prevent voltage flashover for extended service life
Manufactured using high-voltage resistant thermoplastics to prevent premature coil failure
We performed an extensive engineering analysis of OE DG500 and DG508 to BWD®. 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)|
BWD® Ignition Coils look, fit and perform like the original they relace with 100% end of the line production testing. The BWD® coils also provide an improved secondary winding design (additional winding bays) that helps prevent internal arcing and high-voltage breakdown.
The BWD® coils match or exceed the OE coils in all categories and are an excellent replacement exceeding the OE performance.
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. BWD® and Intermotor® are leading the way with quality parts and exceptional coverage for this growing category. Take our E745 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.
Silicone rubber boot withstands extreme heat and provides superior insulation
Stainless steel spring resists corrosion
Primary and secondary bobbins made from fiberglass-reinforced polyethylene terephthalate prevent voltage flashover for extended service life
Internal core made from grainoriented electrical steel limits loss factor within magnetic circuit to reduce heat that may affect coil endurance
External core made from oriented silicon steel for durability
Neodymium magnet produces max high voltage output at all speeds
Electronic ignition module profile and feedback signal matches fit, form, and function of original
Tin-plated brass terminals improve electrical contact and protect against corrosion