Strange noise, air leaking/whistling.

[-Leigh-]

Syptoms: When the engine gets warm from spirited driving I start to get a blowing kind of noise when booting it. It sounds like air leaking or something and like a whistle. Doesn't happen when cold/warm and driving normally, only when giving it some beans and when the engine is quite warm.

Diagnosis: Ideas??

 

[Bluebeard]

All of my 172 have done it. As for what it is, i'm sorry I have no idea.

 

[mattjk]

If you lift the bonnet up can you pinpoint the noise to a particular area?

 

[-Leigh-]

All of my 172 have done it. As for what it is, i'm sorry I have no idea.

Not like this they haven't mate, trust me. I know what sound you mean, and this in addition to the normal whistle.

If you lift the bonnet up can you pinpoint the noise to a particular area?

No, because it only happens under load. Rev the engine at idle, and it doesn't do it. I may try and get my work colleague to sit on the bonnet at lunchtime whilst I boot it up the road lol.

It's a similar sound to a boost leak on a turbo car is the best way to describe it.

 

[mattjk]

Not like this they haven't mate, trust me. I know what sound you mean, and this in addition to the normal whistle.

If you lift the bonnet up can you pinpoint the noise to a particular area?

No, because it only happens under load. Rev the engine at idle, and it doesn't do it. I may try and get my work colleague to sit on the bonnet at lunchtime whilst I boot it up the road lol.

It's a similar sound to a boost leak on a turbo car is the best way to describe it.

LOL yeah brake sharply thatl be funny.

As for the problem thats a toughie could be loads of things!

 

[-Leigh-]

Going to pop it along to Rentech tomorrow as I'm in the area.

It could be the where the Cat joins the centre section apparently, as they have a tendency to blow. Hopefully something simple like that, and not a manifold blow.

 

[lemonnobby]

Yea the Cat to centre section clamps come loose ive had a few of these look under the car and see if the exhaust dips down in that area

 

[AlexS]

My money would be on the exhaust/fanimold.