This was a thrown together coil.  I did not have wire to wind this coil, so I scraped a number of motors and spliced the wire together.  This was a test to see if the spliced wire would work.

COIL #2 SPECS:
Dimensions: 4.5-inch diameter and 28 inches in length
Wire Gauge 28
Max arc length 32 inch

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Spark from the 4.5 inch coil.  Note the green glow on the bottom right.  The glow is from the lights in the garage.