combustion engine

In attempting to compete against the internal combustion engine, Tesla may have to do something similar.

And increasingly, cars that rely purely on the old-fashioned combustion engine are more efficient.

This progress was not accomplished by reinventing the internal combustion engine.

Now it is time for us to say goodbye to the internal combustion engine.

The internal combustion engine powered by readily available and low-cost fossil fuels could very well be reaching its natural end.

It represents the greatest possible utilization of the power of heat in an internal-combustion engine.

The stillness of just-before-dawn was broken by the distant rumble of an internal-combustion engine.

The internal-combustion engine is the heart of the submarine.

This was the first instance of the use of an internal combustion engine in connection with aeronautical experiments.

But the chief method of employing oil for generating power is to use it in an internal combustion-engine.