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Schematic drawing of vibrating jumb-spark coil.

Set of 8 Motorcraft Spark Plugs SP-515 PZH14F + 8 ADP Ignition Coils For 2005 2006 2007 2008 Ford F150 F-150 GDG511 GD511 FD508

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MSD Multiple Spark Coil Kits | JEGS High Performance

The HuffyDavidson High Performance Spark Plug Coil is a replacement for the stand alone coil for the HuffyDavidson Lightning performance CDI. If the spark plug cap or coil wire have given up on you, simply install this coil to your Lightening CDI and you're back on the road!

In this mode of operation, the coil would "buzz" continuously, producing a constant train of sparks. The entire apparatus was known as the 'Model T spark coil' (in contrast to the modern which is the actual coil component of the system). Long after the demise of the Model T as transportation they remained a popular self-contained source of high voltage for electrical home experimenters, appearing in articles in magazines such as and projects for school as late as the early 1960s. In the UK these devices were commonly known as and were popular in cars pre-1910, and also in commercial vehicles with large engines until around 1925 to ease starting.

NGK - Design of a double spark coil

Remove spark plug coil to access spark plugs.

The HuffyDavidson High Performance Spark Plug Coil is a replacement for the stand alone coil for the HuffyDavidson Lightning performance CDI. If the spark plug cap or coil wire have given up on you, simply install this coil to your Lightening CDI and you're back on the road!

The Model T (built into the ) differed from modern implementations by not providing high voltage directly at the output; the maximum voltage produced was about 30 volts, and therefore also had to be run through the spark coil to provide high enough voltage for ignition, as described above, although the coil would not "buzz" continuously in this case, only going through one cycle per spark. In either case, the low voltage was switched to the appropriate spark plug by the mounted on the front of the engine. This performed the equivalent function to the modern , although by directing the low voltage, not the high voltage as for the distributor. The timing of the spark was adjustable by rotating this mechanism through a lever mounted on the . As the precise timing of the spark depends on the 'timer' and the trembler contacts within the coil, this is less consistent than the breaker points of the later distributor. However, for the low speed and the low compression of such early engines, this imprecise timing was acceptable.