3 4 H P Gasoline Engine 154

These are definitely some interesting engine pictures. It does seem a bit confusing, however, to see gas turbines, Wankels, and steam engines mixed in randomly with conventional reciprocating IC engines.

One other comment seems worth mentioning. In those animations that show valve action in a conventional reciprocating engine, the lifts shown are absurdly high. This is probably done for visual effect, but it far exceeds reality and thus misleads the viewer as to the true shape of an IC engine cam.