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[mark.adams]

Windows open, hurtling down the bypass i noticed a high pitch whistle that increased in crescendo with engine speed, from about 3500 upwards in fact, could that be an air leak?
You can't hear it at all below 3000.

[feeutfo]

woo, Bathurst edition Omega aye? Unless you have a supercharger under there then would def. start looking for air leak as you say. Def a whistle though? Not a screatch from a baring or belt? Tensioner ok? Whens the belt due?

Get an assistant to rev it while you listen under the bonnet. :-)

[mark.adams]

def sounds like a whistle, belt changed along with HG 3 or 4 months ago, pitch of noise def changes with revs of engine.
Gonna get colleague wedged under bonnet while i rev it i think... It's an odd noise.
Haven't tried repeating it at standstill.... might give that a go also.

[mark.adams]

UPDATE
It doesn't make the noise at standstill and revving the engine....
That makes it something to do with engine drive output i reckon....