Rear of car sounds like Helicopter?


#1

My rear tires sound like a helicopter, not an exaust issue, the sound speeds up when I accelerate?


#2

Sounds like flat spots. Did you recently lock up the rear wheels during hard braking or spin out? Either will put flats spots on the tread.


#3

Is there a vibration associated with the noise? If so, there may be a tire separation.

Let me add: If the tires are old you MAY have a tire separation in a sidewall and have a bulge in the rubber hitting something as the tire turns in the wheel well.


#4

What kind of car? A ‘whomp whomp whomp’ sound from the rear can also be a wheel bearing. Wheel bearing sounds will change as they warm up. Tire flat spots will sound pretty much the same through the whole drive.


#5

You can try rotating the tires, front-to-back, to see if the noise changes position. If so, suspect one of the tires.


#6

If it is a rear drive car check rearend


#7

what kind of vehicle? (he asked kindly).

for all i know it is a helicopter (in that case its normal)