1.   As the floor levelled off the lights flickered and came up, the engine noise settling down to a steady background roar.

2.   For perhaps half a minute we strained to identify the source of the engine noise.

3.   He noticed the change of pitch in the engine noise and the slight tilt of the aircraft as it began its descent.

4.   I yelled over the engine noise of the old Dodge van.

5.   Richmann tensed as the approaching engine noise reached a peak.

6.   The dark of the tunnel hammered the engine noise back at us, water drumming on the roof above my head.

7.   This was done and almost immediately we noticed increased engine noise.

8.   The engine noise rises only slightly as I speed along.

9.   There was a slight shudder and the engine noise dropped.

10.   The engine noise changed abruptly as the car leapt forward.