Whats the piece sponge for?

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upnorth
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Whats the piece sponge for?

Unread post by upnorth »

About to do my first service on my 308 (130/1.2 Puretech) - haven't pulled the car to bits yet so it might be obvious when I have - this is in anticipation...
Where does the piece of sponge fit? (or is it for mopping your brow after having to remove half the car to get the air filter in? :-D )
Image

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GiveMeABreak
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Re: Whats the piece sponge for?

Unread post by GiveMeABreak »

It definitely seems part of the filter, so don't chuck it away just yet!
308 Air Filter.PNG

moizeau
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Re: Whats the piece sponge for?

Unread post by moizeau »

Looks like a pre-filter, though I've never seen one in the flesh.

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Hell Razor5543
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Re: Whats the piece sponge for?

Unread post by Hell Razor5543 »

I have had, on a few occasions, ait filters with sponge stuck onto them.

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Skull
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Re: Whats the piece sponge for?

Unread post by Skull »

Maybe just a support :?:

MikeT
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Re: Whats the piece sponge for?

Unread post by MikeT »

For the crankcase breather perhaps?

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bobins
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Re: Whats the piece sponge for?

Unread post by bobins »

I'd guess it's a pre-filter. The genuine air filters for the C5 X7 have 'sponge' bonded to the face of the filter material - this can help to extend the service life of the air filters as it filters out more coarse material. I'd suspect there's a place in the air filter housing for that sponge in your photo to fit.

admiral51
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Re: Whats the piece sponge for?

Unread post by admiral51 »

Maybe a manufacturing cock up and cheaper to produce a bit of foam than redo the housing :)

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white exec
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Re: Whats the piece sponge for?

Unread post by white exec »

Something to damp an unwanted vibration?? #-o
Maybe someone could ask next time they go into a PSA service centre...

moizeau
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Re: Whats the piece sponge for?

Unread post by moizeau »

And the riddle goes around and around.....
Last edited by myglaren on 12 Jun 2019, 20:53, edited 1 time in total.
Reason: YouTube tags

upnorth
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Re: Whats the piece sponge for?

Unread post by upnorth »

Sorry about the delay guys, got round to doing the service last weekend

Here it is in-situ
Image

Removed
Image

Comparison:
Image

The car has obviously been serviced prior to me getting my hands on it so looking at how much the sponge is deformed, the fit of it and the shape of the new one, I'm not all that convinced that it's in the correct position in the first picture - I just don't know; I couldn't see anywhere obvious it would fit and needless to say I rammed this one back where the old one came out of!

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white exec
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Re: Whats the piece sponge for?

Unread post by white exec »

Does it actually do anything in that hole, or just fill up a cavity? Would any air pass through it?

upnorth
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Re: Whats the piece sponge for?

Unread post by upnorth »

Yes there's an outlet from the airbox that goes to some kind of electronically controlled valve/sensor on what I assume is the intercooler pipe:

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white exec
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Re: Whats the piece sponge for?

Unread post by white exec »

Aha! :chin: