Excellent 3D 4-stroke engine animation

Very useful app for understanding cylinder layouts, timing cycles, and valve designs of various production automotive and motorcycle gasoline engines. It doesnt cover every engine in existence, but that isnt the point. It offers several pre-built variations of standard designs, but also unique features such as the Wankel engine, flatplane crank, and desmodromic valves. You can also adjust parameters to create other designs which is a great feature.

Scat Pack about Trans4motor - Engine Simulator