Bearing like whine?

[scottishpedro]

I am getting a bearing like whine when accelerating (almost sounds like a quiet supercharger) in my 8v M2. It is noticeable between 2k-3k revs and is present when I come off the accelerator (and freewheel for example going downhill).  I tried slipping into neutral and the noise seemed to reduce, although this isn't conclusive, I may be imagining this.  I wondered if I had over tightened the alternator belt but the noise isn't present when the car is stationery (I also removed the belt and there does not seem to be any unusual play in alternator/water pump pulleys).  Any suggestions?  Possibly front wheel bearings?

Thanks in advance

Pete

[Loynes]

Turn the radio up! Sorry cant be any more helpful. Martin

[lemski]

alternator bearing i should say. dont hold me to that as its an educated guess (well with pugs anyway)

[scottishpedro]

Ha, yeah that would work.  Haynes manual didn't suggest that!

[scottishpedro]

alternator bearing i should say. dont hold me to that as its an educated guess (well with pugs anyway)

That was my initial thought but I would have expected the noise to be there when sitting in neutral and revving engine?

[lemski]

Whells bearing would be my next assumption if when moving, is it from front or rear of the car do you know?

[scottishpedro]

It sounds like it is from the front, rear bearings were done recently so not them.

[lemski]

Have you checked for play in ur bearings? Also does it get slightly worse if you turn a certain way?

[H Singh]

Deffo bearing just work out if its front or back . Had the same issue on my mk2 16v about 2 months ago!

[DOA]

Diff bearings  ?