[5801edwardholmes]

Now had my Bentley Arnarge, Red Label 2000 model, for 3 months; all small defects/ improvements carried out but cannot find source of an annoying 'whistle' when under load or accelerating! .When 'coasting; runs silent as it should. Any advice very welcome as it is spoiling my enjoyment of this fine vehicle.

Regards Edward

 

[alabbasi]

The noise should be directly proportional to how deep your right foot is buried in the carpet

 

[guyslp]

I'm thinking turbo whine, which is not uncommon (almost characteristic, I'd say).

 

[5801edwardholmes]

Going out for the weekly Wednesday run tomorrow, so will check that out.

 

[5801edwardholmes]

I'm thinking turbo whine,

Possibly, but sounds more like a whistle and as said, only occurs under load or acceleration.

 

[guyslp]

and as said, only occurs under load or acceleration.

Which is why I think it's turbo whistle. As @alabbasi said, the degree of "whistle" should be directly proportional to how hard you're pushing the car. They're almost never silent.

It should be much more noticeable when you're "flooring it from rest" than it is accelerating from say 60 to 70 MPH.

 

[Wraithman]

vacuum leak, find a shop with a smoke machine or smoke a big ole cigar to find the breach. Have you ruled out an alternator bearing or the idler pulley?

 

[ROLLS-ROYCE TEXAS]

Small hole or split in one of the intercooler hoses

 

[5801edwardholmes]

Yes, had pulleys and belts checked. All Ok. Possibly alternator, but definitely more a whistle than a whine. Weather here to bad, freezing and snow etc, to take anywhere yet.

 

[5801edwardholmes]

Small hole or split in one of the intercooler hoses

Possible, but i first need to find which are the intercooler hoses! I am beginning to accept it may be turbo or alternator and also getting used to it. which may not be a good thing though?

 

[umtaliman]

If only occurring under load (wide open throttle, WOT) as mentioned very likely a leak in one of the large hoses connecting the turbos to the intercooler. Probably a loose clamp but could also be a small crack in the hose. WOT spins up the turbos and creates positive pressure in the induction system so a loose clamp can cause some blow by. Low throttle will give negative pressure and suck the hose snug. Try tightening the clamps first.

 

[5801edwardholmes]

Occurs as soon as the acceleration pedal is pressed at any speed and ceases as soon as foot lifted from pedal.

 

[Wraithman]

Can you hear it when in park and revving the motor?

 

[umtaliman]

Occurs as soon as the acceleration pedal is pressed

Then it is most likely one of the hoses mentioned above. I don't know the turbo setup on the 6.75 engine but there will certainly be hoses between the turbo(s) and intercooler and intercooler and throttle body. Check the hoses and clamps on all these and also any small hose on the intwercooler and throttle body which may have come loose.

 

[5801edwardholmes]

Can you hear it when in park and revving the motor?

No, tested this morning. No 'whistle when in neutral and parked and then revved a few times; however as soon as i put in drive ( so under load ) to drive away, the whistle was there. Getting used to it now.

 

[Wraithman]

Does it occur when the wheels just start to rotate when in drive? Has anyone removed the wheels?

 

[5801edwardholmes]

What are you trying to say? Not very helpful or supportive. I thought this was a forum for Bentley Enthusiasts to share info and experiences to assist one another.

 

[Wraithman]

Not supportive? I don't think you will find another site to help you better in the RR/B community. Proper diagnostics requires questions and if you feel your needs are not being met here you could always cast your fate to the local gas station or a dealer who knows nothing about servicing your car. Your car, your choice.

 

[5801edwardholmes]

I agree with you, in part. However the, to me, out of place humour about the wheels was not funny. I am 79yrs old, served over 22 years in the British Army as a vehicle mechanic, and decided to spend 1/3 of my life savings on a Bentley Arnarge to fore-fill a lifelong ambition, part of the ( major) decision was having a very good local repair garage with some years of servicing and a good reputation carrying out repairs on Bentleys ,not requiring special equipment ,in our area. As i am still on a learning curve I find the forum invaluable.

 

[Wraithman]

My post was not funny. I was trying to determine whether the noise generated was from a static (standstill) vs a dynamic (moving) condition. Good luck