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Why does the 931 have a different Auxiliary air valve?

 
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Johann  



Joined: 07 Aug 2016
Posts: 163
Location: Netherlands
PostPosted: Wed Aug 10, 2016 8:55 am    Post subject: Why does the 931 have a different Auxiliary air valve? Reply with quote
The 931 has this auxiliary air regulator:
Bosch part number: 0280140220
Porsche Part number: 931 606 102 00


The Normally aspirated 924 has this auxiliary air regulator:
Bosch part number: 0280140169
Porsche part number: 047 133 453 A


Can anyone tell me what the difference between these valves are since the NA version is way cheaper than the 931 version. Are they interchangeable?

Last edited by Johann on Wed Aug 10, 2016 8:15 pm; edited 1 time in total
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11346
Location: PacNW
PostPosted: Wed Aug 10, 2016 11:53 am    Post subject: Reply with quote
Is the turbo unit stronger in some way because it's exposed to boost pressure?
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ideola  



Joined: 01 Oct 2004
Posts: 15489
Location: Woodstock IL
PostPosted: Wed Aug 10, 2016 12:11 pm    Post subject: Reply with quote
The turbo unit is much larger, has larger orifices, and is not adjustable in the manner that the NA is. As for internals, I don't know what the difference might be.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11346
Location: PacNW
PostPosted: Wed Aug 10, 2016 1:19 pm    Post subject: Reply with quote
You also might start cross referencing other euro cars. That type of aav was installed on literally millions of cars.
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Johann  



Joined: 07 Aug 2016
Posts: 163
Location: Netherlands
PostPosted: Wed Aug 10, 2016 5:00 pm    Post subject: Reply with quote
Knowing Porsche there would have been a good reason for it. As far as I know the 931 and 930 share the same valve, so Rasta Monsta, I think you might be correct in that it is very likely that they are beefier to deal with the added pressure in the inlet circuit.
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Johann  



Joined: 07 Aug 2016
Posts: 163
Location: Netherlands
PostPosted: Wed Aug 10, 2016 8:14 pm    Post subject: Reply with quote
Still scouring the web for answers, but I came across this photo. The refulators seem to be the same size.

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