Sound foam removal- question

bigwinn

bigwinn

Elite
 Lincoln UK
Site Supporter
Evening

Clutching at straws a bit but asking for an opinion

Would removing foam from the sound mod cause any form of air leak into the system?

Stuart
 
I'd guess if there was a rupture in the sound generator, which I believe is basically a resonating drum-skin type of thing, then air could leak through it. Perhaps the foam was enough to stop it happening.
Easy to block the whole thing by taping a poly bag across the end of the pipe where it enters the cabin and see if it cures it?
 
As enuffzed said, the system is designed to be sealed & shouldn’t interfere with engine running - damage could cause it but I’ve not heard of that happening on here?
Rob
 
bigwinn said:
Evening

Clutching at straws a bit but asking for an opinion

Would removing foam from the sound mod cause any form of air leak into the system?

Stuart
Click to expand...

Yes. There was someone on here who had water ingress into the passenger side footwell because his sound generator pipe wasn't flush with the back of the bonnet where it enters the inside of the car. So if water can get in then so can air if it's not seated correctly. Open your bonnet and make sure it pushed in and sitting flush. You may need something to seal it if need be. Some outdoor sealant used on glazing or bathrooms could do the trick it's available in black also rather than white.
 
SonnyA85 said:
bigwinn said:
Evening

Clutching at straws a bit but asking for an opinion

Would removing foam from the sound mod cause any form of air leak into the system?

Stuart
Click to expand...

Yes. There was someone on here who had water ingress into the passenger side footwell because his sound generator pipe wasn't flush with the back of the bonnet where it enters the inside of the car. So if water can get in then so can air if it's not seated correctly. Open your bonnet and make sure it pushed in and sitting flush. You may need something to seal it if need be. Some outdoor sealant used on glazing or bathrooms could do the trick it's available in black also rather than white.
Click to expand...
No.
The sound generator is a sealed unit. Unless it is internally split then air could only get from the cabin to the back side of the generator and no further. It would do this regardless of whether it is plugged in to the bulkhead or not.
 
enuff_zed said:
SonnyA85 said:
bigwinn said:
Evening

Clutching at straws a bit but asking for an opinion

Would removing foam from the sound mod cause any form of air leak into the system?

Stuart
Click to expand...

Yes. There was someone on here who had water ingress into the passenger side footwell because his sound generator pipe wasn't flush with the back of the bonnet where it enters the inside of the car. So if water can get in then so can air if it's not seated correctly. Open your bonnet and make sure it pushed in and sitting flush. You may need something to seal it if need be. Some outdoor sealant used on glazing or bathrooms could do the trick it's available in black also rather than white.
Click to expand...
No.
The sound generator is a sealed unit. Unless it is internally split then air could only get from the cabin to the back side of the generator and no further. It would do this regardless of whether it is plugged in to the bulkhead or not.
Click to expand...

I was assuming he was worried about fumes getting into the car from oil being burnt off the engine, or along those lines, etc. Not air going the opposite way inside the footwell to the engine bay.
 
SonnyA85 said:
I was assuming he was worried about fumes getting into the car from oil being burnt off the engine, or along those lines, etc. Not air going the opposite way inside the footwell to the engine bay.
Click to expand...

bigwinn said:
cause any form of air leak into the system?
Click to expand...
 
As long as the membrane is intact no air leak; as long as at least one of the foams is still there you'll have tympanic membranes :D

I've twice removed one foam and both times refitted after a couple of days, too harsh for my taste.
 
DMike said:
As long as the membrane is intact no air leak; as long as at least one of the foams is still there you'll have tympanic membranes :D

I've twice removed one foam and both times refitted after a couple of days, too harsh for my taste.
Click to expand...

Tympanic membranes- wow every day is a school day
 
bigwinn said:
DMike said:
As long as the membrane is intact no air leak; as long as at least one of the foams is still there you'll have tympanic membranes :D

I've twice removed one foam and both times refitted after a couple of days, too harsh for my taste.
Click to expand...

Tympanic membranes- wow every day is a school day
Click to expand...
The length of the tube and space around it would allow installing a solenoid valve to either shut the tube or bypass any foam sections, according to mood. That mod would not too far from those many of us had on bikes when kids (https://www.youtube.com/watch?v=FLimv9aL2WQ). Now my 6er augments reality by playing synthetic engine grunt from speakers.
 
Yeah I don’t think this area is the root cause of my issues

Close it off but thanks all for your input
 
Smartbear said:
enuff_zed said:
DMike said:
As long as the membrane is intact no air leak
Click to expand...

Think that's what I was searching for when I said drumskin. :D
You have made it sound much more technical. :thumbsup:
Click to expand...

Possibly damaged by drumsticks :P
Rob
Click to expand...
Wasn't me, BMW used "membrane" in this https://studylib.net/doc/25721906/03-e85-m54-engine document, page 10. Describes the sound generator, a.k.a. MSS "motor sound system" in depth. I guess BMW used these documents for training internally.
 
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