Internal combustion as a term of art, from The New York Times.
The state of the internal-combustion art has never been more artful. Direct fuel injection, variable valve timing, computer-controlled ignition systems and a hundred other technologies have become tools for shaping how an engine performs. Engineers can add torque here, subtract it over there, let the engine rev at one point and hold it back at another. This is a new artistic medium, and Audi’s latest V-8 engine is a masterpiece.