11.   The engines roar in the Formula One pit.

12.   The engines roared to life, the boat turned back toward the bridge and sped off toward the horizon.

13.   The turbo shrieks and roars, the engine roars and clatters, the tires add their own murmur to the cacophony, and the wind noise is fierce.

14.   What a noise we made, what an engine roar!

15.   An engine roared.