Tesla The Band Name Based On Nikola Tesla & Album "Mechanical Resonance" aka "Mechanical Oscillator", Reciprocating Engine, "Earthquake Machine" could “split the earth like an apple.” (TeslaLeaks.com)

What is the potential energy in the part that causes the Mechanical resonance related to the timing of an Internal Combustion Engine aka Earthquake Machine? Answer: "the 'rigidity' of a spring."