Amazing video showing how a four-stroke engine works and what’s happening inside the cylinderSome guys took a small engine, removed the head and replaced it with an inch of acrylic glass. Then they set up the cameras and shoot a 4K video of the combustion process. The result is fantastic. The video is made by“> “Warped Perceptions” – already famous for their videos and we found it on asphaltandrubber website. It has more that 6,5 million views. Enjoy it!