The motor noise increased, and the plane began to move.

Fran raised the volume and held the small radio so Soames could hear it above the motor noise.

The motor noise remained for a bit at the same level of intensity, then came back, growing increasingly louder.

Then the motor noise came in again strong and increased in volume steadily.

I heard a distant motor noise and tried to decide if it was coming or going.

The headlights blind him, and the motor noise covers any sound of the trees scraping together in wind.

Not just having a motor noise, but a modern noise that marks your vehicle out.

There was so much motor noise down below.

The motor noise dropped to a rumble and feet clattered around his car.

They could hear those other sounds that trucks always make in addition to their motor noises.