So I had two broken BPC valves - one that had a broken disc (common of late-model genuine saab valves - the kind you buy at the dealer for $250 - I went through three of these in a year), and another one that I bought off of eBay with burned-out coils, hoping that the disc inside would still be intact.

The disc was good, so I opened up both valves, and transplanted the good disc from the old valve into the "new" valve with the broken disc.

And Voila! it works. I believe that the reason for the new ones failing so rapidly is because Saab no longer makes them / subcontracts the manufacturing of these out-of-date parts to another company. The alloy of the carbon-steel floating disc is crucial, as it is a very high-stress part that flutters in between two powerful magnetic coils - and the new company that makes the "genuine saab" valves can't get that alloy right, because the discs keep cracking after 3000 miles (how long each of mine lasted).

I also made a new mounting bracket for the valve, to mount it horizontally (like in the 900's and 9-3's, which experience much fewer of these failures) Hopefully with all of this, I will never have to replace a BPC valve again.

So if you ever wanted to know what's inside that outrageously overpriced valve, here it is:

http://community.webshots.com/album/559988198jGxTto




posted by 75.69.184...

• BPC Valve Surgery and pics, Aero94, Sun, 22 Jul 2007 19:34:38 <-- Viewing This Message
  • Re: BPC Valve, broken disc, BobS, Mon, 23 Jul 2007 20:40:44
  • I gonna go cut my old one open..., PeterH, Mon, 23 Jul 2007 08:51:42
    • Just mounted the BPC horizontally..., PeterH, Mon, 23 Jul 2007 09:50:08
  • looks like a reed valve, KenManiac , Mon, 23 Jul 2007 06:47:32
  • Nice work! When I have some time I have, Noel, Mon, 23 Jul 2007 06:20:31
  • How do you seal the whole assembly back..., TKC, Sun, 22 Jul 2007 20:11:36
    • Re: How do you seal the whole assembly back..., Aero94, Sun, 22 Jul 2007 20:37:51
      • good work!, gavin, Sun, 22 Jul 2007 23:37:49

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