Shop great deals on ECHO Chainsaw Ignition Coils. Get outdoors for some landscaping or spruce up your garden! Shop a huge online selection at eBay.com. Fast & Free shipping on many items! Testing or checking an ignition coil can tell you a lot about the health of your ignition system. Since the coil is the center of the system, it has to be working right or the car will not run right. Testing the coil requires an ohms meter. If you do not have one, you can buy one at a home center or building center.

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. Our Coil-on-Plug assemblies are engineered and tested to meet or exceed OE standards for spark energy, impedance, and durability. WINDING RESISTANCE / INDUCTION AND OUTPUT VOLTAGE / SPARK ENERGYPrimarySecondaryOutput VoltageSpark EnergyResistanceInductanceResistanceInductance50pf60 Hz60 HzPart no.(mohms)(mH)(kohms)(H)(Peak kV)(mV-S)(mJ)BWD ® E2614921.535.369.59.6BWD ® E2624891.495.289.47.9Average BWD ®4911.515.329.53.8OE DG5005151.635.558.61.8OE DG5085111.585.508.19.5Average OE5131.615.538.40.7The FindingsBWD ® 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 tested 3.7% higher than OE in output voltage. The BWD ® coils were equal to OE in spark energy.

In waveform testing, BWD ® coils’ peak output voltage was about 1000 volts higher than OE. The BWD ® coils had a longer spark duration than the OE, resulting in more energy supplied to the spark plugs.The BWD ® coils match or exceed the OE coils in all categories and are an excellent replacement exceeding the OE performance.

Electric, solar-powered and alternate fuel vehicles may be the wave of the future, but for now most automobiles run on gasoline, which they burn in an internal combustion engine to convert into motion. For combustion to take place, a spark is needed to ignite the fuel mixture in the engine.

The vehicle’s ignition system is designed so that a 12-volt battery can generate the very high voltage required to create such a discharge. The heart of this system is a device called an ignition coil.This coil is a kind of. Transformers transfer voltage from one circuit to another, either as a higher voltage (as in a step-up transformer, of which the ignition coil is an example), or a lower voltage (a step-down transformer).

The key principle that makes transformers work is: A moving magnetic field, or a change in a stationary magnetic field (the case in our ignition coil), can induce a current in a wire exposed to that field.This ignition coil is a pulse-type transformer. Like other transformers, it consists, in part, of two coils of wire, as shown in the diagram at right. These are both wrapped around the same iron core. Because this is a step-up transformer, the secondary coil has far more turns of wire than the primary coil, which is wrapped around the secondary.

In fact, the secondary coil has several thousand turns of thin wire, whereas the primary coil has just a few hundred. In your car, this allows some 40,000 volts of electricity to be generated by a modest battery, as the tutorial below illustrates. Click the blue Turn On button to close a Knife Switch and create a circuit that allows current (depicted by a red glow in the circuit) to flow into one of the Primary Terminals to the primary coil. (AC) is used in most types of transformers because the constantly changing magnetic field that it creates in a primary coil allows for a continuous induction in the secondary coil. In a car’s ignition system, however, direct current (DC) is used (provided by the Battery), because the idea is not to create steady, continuous induction, but one single, dramatic induction from a sudden collapse of a magnetic field.As current flows to the primary coil, an increasingly large magnetic field builds up around it as well as around the secondary coil housed inside.

If you click on the red Turn Off button to stop this current, the field suddenly collapses, and this rapid change induces a surge of current in the secondary coil, which streams out the high voltage Output Terminal and is enough to jump the Spark Gap in the circuit. This spark then ignites the fuel mixture and gets the motor running.There is just one problem with this scenario. The collapsing field also induces a lesser surge in the primary coil, creating a second, unwanted surge of electricity traveling back through one of the primary terminals toward the switch. To keep that surge from reaching the switch (and creating a damaging spark across those points), a Capacitor is inserted in the circuit. This capacitor – called a condenser in auto ignition systems – safely absorbs the back emf.Thanks to our scientific advisors on this page, head electronics engineer in the MagLab's Instrumentation & Operations division, and Russell Wood.