A long time customer of Performance Trends sent them this high speed video of a valve spring pack in operation at high RPM. You can see the coils oscillating and the outer spring actually breaks. It really gives you an appreciation of the fact that things are not always under control, even in the most well built race engines. | EngineLabs

How To Make Spring Fee Energy Engine Self Running Flywheel Machine With 5 Springs | World Invention videos

A spring and flywheel engine developed months ago was said to produce unlimited energy. The creators are replicating indoor tests of the machine outdoors, at the request of viewers, to show how it works. #springengine #flywheel #energy #technology #innovation | Hidden Technology