So steering is done by moving the direction of the small internal engine.

He'd been told to listen for the sound of an internal combustion engine.

It is used to force air into an internal combustion engine.

Isn't it now time to give up the internal combustion engine?

In practice, of course, that is not how an internal combustion engine works.

The first internal combustion engines must have looked like this, to the people who'd never seen one before.

For now, however, the internal combustion engine will continue to rule.

On the open road, the primary power source is the internal combustion engine.

This was the first internal combustion engine to be produced in numbers.

By the end of the decade, many cars will not be using internal combustion engines at all.