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The principle I alluded to in post 3 applies to the window seals.
If I hand one of my flutes to someone not trained they can blow into it and all one hears is a noise of some kind caused by the airstream. I then take the instrument and can play every note across a three plus octave range that can be heard in every corner of a concert hall and I can even bend the pitch of every note should I chose to. Same principle happens when an air steam flows over a sharp edge- if the seal is not seated correctly and a natural resonance is created .
I the seal is not seated correctly or there is a small tear in it it just might be enough to cause what you are hearing. If you hear the noise and then open the window if the noise disappears then you know what the root cause is. That the noise happens at a specific speed [frequency] probably tells us you are looking for a leak path that has opened up for whatever reason. Needless to say trying to locate such whilst driving at whatever speed on a busy motorway is not exactly easy. Maybe you need a passenger to help trace the exact location
I never imagined you'd be an accomplished flautist Fred! More accomplished than my noise sleuthing anyway as the leak was not the cause (but has reminded me I must replace that seal asap). No change in noise with window open but it sounded as if it was coming from door mirror or leading edge of door, but no change when I stuck hand around mirror/frame at different points. Even wondered if maybe membrane in door had come away from its adhesive edges and was flapping around. It really does sound as if a plastic shopping bag is flailing around but nothing visible. Only 'progress' is that the noise now starts around 70 rather than 60, same road and same very still and hot weather. I'm going to put her on ramp tonight and take trays off and have a good look. After that will remove door card if I can't find anything amiss.
Last edited by StratfordShark; 06-09-2021 at 02:06 PM.
Do you have rub strips? I just remembered that the rub strip on the right door of my car is loose in the middle and it has been making a noise that might be similar to yours. I haven't driven it in a while since I had to change the alternator and it is still up on jack stands while I fit a belly pan to it.
Last edited by Jerry Feather; 06-09-2021 at 02:13 PM.
I never imagined you'd be an accomplished flautist Fred! More accomplished than my noise sleuthing anyway as the leak was not the cause (but has reminded me I must replace that seal asap). No change in noise with window open but it sounded as if it was coming from door mirror or leading edge of door, but no change when I stuck hand around mirror/frame at different points. Even wondered if maybe membrane in door had come away from its adhesive edges and was flapping around. It really does sound as if a plastic shopping bag is flailing around but nothing visible. Only 'progress' is that the noise now starts around 70 rather than 60, same road and same very still and hot weather. I'm going to put her on ramp tonight and take trays off and have a good look. After that will remove door card if I can't find anything amiss.
Doubtless the problem will be something daft. I once had the mirror element come undone from its backing plate after the adhesive dried out. Initially I heard a strange noise but could not figure out what it was then I spotted the mirror glass flapping, stopped, managed to get it off without breaking it and later on stuck it back on.
On the flute thing I was twice invited to audition for the National Youth Orchestra and only just missed out on selection! Turned out the folks I was competing against went on to be top UK professionals. Trouble in that game is you have to be brilliant to avoid starvation! Figured I would make a lot more $$$'s in the oil industry- I was right! Thus I was able to purchase some really nice flutes later on including a couple of professional model instruments. Just wish I had them to play on when I auditioned instead of my student model flute which is still in immaculate condition and plays surprisingly well- in reality it is probably me who cannot play like I used.
Sometimes we 928 guys have a lot more in common than just the 928. I too have a flute. It is one that seems to have come to me out of one of my many cases. I think it is just a student level flute; and I have never even taken it out of the case much less blown in or over it.
Doubtless the problem will be something daft. I once had the mirror element come undone from its backing plate after the adhesive dried out. Initially I heard a strange noise but could not figure out what it was then I spotted the mirror glass flapping, stopped, managed to get it off without breaking it and later on stuck it back on.
On the flute thing I was twice invited to audition for the National Youth Orchestra and only just missed out on selection! Turned out the folks I was competing against went on to be top UK professionals. Trouble in that game is you have to be brilliant to avoid starvation! Figured I would make a lot more $$$'s in the oil industry- I was right! Thus I was able to purchase some really nice flutes later on including a couple of professional model instruments. Just wish I had them to play on when I auditioned instead of my student model flute which is still in immaculate condition and plays surprisingly well- in reality it is probably me who cannot play like I used.
Wow I have a cousin who was in NYO (Viola) and as you say she went on to pro career - endless recordings and broadcasts - and her daughter has followed her into NYO. You must have reached insanely high standard.
Well as Fred predicted, the problem couldn’t have been dafter. Look what I found after putting her on ramp. That front tray was always in crappy condition, so will be nice to replace (but I’ll salvage the ducts). Was using repair washers at connection with spoiler and something finally gave up.
I don't think you have found your problem at all. When you fix all of this with the belly pan you are still going to have the wind noise problem. Just my prediction; but WTF do I know?
Last edited by Jerry Feather; 06-09-2021 at 03:14 PM.
Sometimes we 928 guys have a lot more in common than just the 928. I too have a flute. It is one that seems to have come to me out of one of my many cases. I think it is just a student level flute; and I have never even taken it out of the case much less blown in or over it.
Jerry,
Looks like a Boehm system [student model] concert C flute probably from the 60's or earlier. Student flutes came into being to facilitate playing by youngsters with smaller hands- the give away being the two keys in the middle of the main body that are offset- little hands with shorter fingers could not reach the keys when in a straight line as the professional flutes typically are [or were]. This created a problem in that when these youngsters grew up and wanted a better flute they by then did not like the keys being in a straight line so now one sees both versions in the mid and professional range instruments. The age of that flute to some extent is given away by the lack of what is known as a split E mechanism. The flute in your pic does not have this feature and what that means is that top E will be off pitch quite a bit and it thus takes quite lot of expertise to play/manipulate that note into correct tune.
As a matter of interest what makers name is embossed on the neck?
Wow I have a cousin who was in NYO (Viola) and as you say she went on to pro career - endless recordings and broadcasts - and her daughter has followed her into NYO. You must have reached insanely high standard.
I played at grade 8 standard which should have been good enough to get me into the top music colleges but my sight reading was a weakness and probably why I did not quite make the grade into the NYO. A girl in our school same year as me got in the NYO playing violin - the playing standard for that was grade 6 as the UK could not produce enough grade 8 violinists in those days to meet the demand so entry was that much easier- she was a very good player nonetheless.
I used to play a number of the accepted flute standards including the Mozart flute concerti and the 8 Bach flute sonatas. The trouble with the latter was that no one told Bach the flute was a wind instrument and one of the sonatas has a run that needs lungs like a Special Boat Squadron marine to play it! My school friends used to wonder how I could swim as far as I could underwater!
Enough of the music - good to see you have found a likely cause of your problem- what is left of it must be slapping around somewhat viciously. I have an aluminium front under try and highly recommend such. I got mine from Carl at 928 motorsports - doubtless our other parts suppliers will probably offer them. Mine does not have the air scoops- whether or not they make much difference I am a bit skeptical about. The Volvo mounts I got from Roger have been in there over 5 years and are still going strong. If I had to fork out form the pukka Porsche items I might be a bit more concerned.
I don't think you have found your problem at all. When you fix all of this with the belly pan you are still going to have the wind noise problem. Just my prediction; but WTF do I know?
Jerry I’ll give her a spin tomorrow now the tray’s off, and will let you know. With the window open the noise I thought was wind certainly sounded very rattle/mechanical, so could have been airflow pushing the loose front of tray up and down.
I don't think you have found your problem at all. When you fix all of this with the belly pan you are still going to have the wind noise problem. Just my prediction; but WTF do I know?
Jerry,
I reckon the airflow under the spolier hitting the unsupported edge of the fractured remnants of the Hong Kong rubber dog poo plastic tray ought to produce a splendid rendition of Yankee Doodle Dandy at speed.
I played at grade 8 standard which should have been good enough to get me into the top music colleges but my sight reading was a weakness and probably why I did not quite make the grade into the NYO. A girl in our school same year as me got in the NYO playing violin - the playing standard for that was grade 6 as the UK could not produce enough grade 8 violinists in those days to meet the demand so entry was that much easier- she was a very good player nonetheless.
I used to play a number of the accepted flute standards including the Mozart flute concerti and the 8 Bach flute sonatas. The trouble with the latter was that no one told Bach the flute was a wind instrument and one of the sonatas has a run that needs lungs like a Special Boat Squadron marine to play it! My school friends used to wonder how I could swim as far as I could underwater!
Enough of the music - good to see you have found a likely cause of your problem- what is left of it must be slapping around somewhat viciously. I have an aluminium front under try and highly recommend such. I got mine from Carl at 928 motorsports - doubtless our other parts suppliers will probably offer them. Mine does not have the air scoops- whether or not they make much difference I am a bit skeptical about. The Volvo mounts I got from Roger have been in there over 5 years and are still going strong. If I had to fork out form the pukka Porsche items I might be a bit more concerned.
Yes my plan up till now was always to replace with an aluminium tray, before this failure! The one I’m going to get has no scoops so I’ll just rivet the originals in.
Yes my plan up till now was always to replace with an aluminium tray, before this failure! The one I’m going to get has no scoops so I’ll just rivet the originals in.
My prediction is that since the deterioration of your belly pan has obviously been over a longer period and the noise is kind of sudden, it is much more like mine and some kind of sudden release of the rub strip form the door. Go see if the rub strip is loose from the door. Simple as that.
Last edited by Jerry Feather; 06-09-2021 at 04:16 PM.
06-09-2021, 09:16 AM
