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Chiptosser - I wound the coils myself using no. 22 magnetic wire. The pistons shot into the coils using a 9 volt alkaline battery prior to assembly, but not when everything is together. Here is the address where you can find the plan that I followed...

I recently built a two cylinder solenoid engine that i was hoping to power with a 9 volt battery. It did not work. I tried the 9 volt, an A23 battery (12 volts), two 9 volt in series (18 volts) and three in series (27 volts). Checked with meter and getting sparks at the contacts, but it won't...