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The ignition coils for these can be combined into a single casing (a coil pack) and located away from the spark plugs; however it is increasingly common for coil-on-plug systems to be used, whereby the individual ignition coils are small units attached directly to the top of each spark plug. An advantage of coil-on-plug systems is that in the ...
A typical low-tension coil (reproduction) used in the ignition system of an ignitor-fired engine. A low-tension coil is an electrical device used to create a spark across the points of an ignitor on early-1900s gasoline engines, generally flywheel engines, hit-and-miss engines, and other engines of that era.
(If the engine was rotated while examining the wave-form output of the coil with an oscilloscope, it would appear to be AC. However, since the charge-time of the coil corresponds to much less than a full revolution of the crank, the coil really 'sees' only DC current for charging the external ignition coil.)
This process is repeated continuously, creating a "shower of sparks." (Right) Booster coil components. The booster coil is separate from the magneto and can generate a series of sparks on its own. Current flow through the primary coil sets up a magnetic field about the coil that attracts the movable contact point, breaking circuit is broken.
The ignition coil is a transformer. The primary winding (called the low-tension winding in early texts) is connected to the battery voltage when the points are closed. Due to the inductance of the coil, the current in this circuit builds gradually. This current creates a magnetic field in the coil, which stores a quantity of energy.
In many cases, this may be conducted concurrently with the insertion of the coils. Since the coil's conductors have to pass through an oftentimes tight slot, the coils consist of a certain number of small spare cross-sections which are later connected in parallel. It is with this measure, that large conductor cross-sections may also be produced.
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