I created this in 2013. All elements are custom, from the Blender 3D models I made to the resulting animated flat layout.
This project went ultra viral, and effectively cemented my role as the go-to animated infographic agency (Animagraffs.com). I'm so grateful for the response and the work that's followed. It's been an amazing ride!
The project is also hosted on my agency site at: https://animagraffs.com/how-a-car-engine-works/