What does “Spring Drive” mean on that Grand Seiko dial? Today, we’re unpacking the significance and how Grand Seiko’s Spring Drive Technology works. #GrandSeiko #SpringDrive #JapaneseWatchmaking #watchenthusiast #watchesofinstagram #WatchCommunity | Teddy Baldassarre

948K views · 3.6K reactions | 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 | Facebook