Re: PVC check valve. You guys sure about that one?

Re: PVC check valve. You guys sure about that one? - Saab 900 Bulletin Board - Saabnet.com

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Re: PVC check valve. You guys sure about that one? Posted by MS (more from MS) on Wed, 12 Oct 2005 10:09:42

In Reply to: PVC check valve. You guys sure about that one?, John Roberts, Tue, 11 Oct 2005 23:48:37 Members do not see ads below this line. - Help Keep This Site Online - Signup

I'm usually pretty good at understanding the questions posted on here, but I have to confess that your post confused me. This line in particular doesn't make sense:

"However, I could see how, at high boost, with the turbo creating high vacuum, how you could create a vacuum condition inside the valve cover in which case you would want that check valve to let air into the valve cover to help keep things even in there."

I just can't figure out the logic there. Bottom line is that you want all the turbo charge boosted air to go into the intake manifold, not be diverted to the crankcase (valve cover). The existence of that small line connecting to either the throttle body or a fitting close to the throttle body might be for emissions purposes similar to how the EGR system works, since part of the gases inside the crankcase are exhaust fumes from blowby. The theory is that exhaust gases mixing with intake air helps to cool the combustion charge temps, thus lowering hydrocarbons. Particularly at cruising speeds where intake manifold vacuum is especially high while (cooling) fuel consumption is low. The check valve is to keep the flow going just one way, keeping all boosted air going to the intake manifold.

posted by 207.200.116...

Posts in this Thread:

PVC check valve. You guys sure about that one?, John Roberts, Tue, 11 Oct 2005 23:48:37
- question of the day - is a PCV valve made from PVC?, speegee, Wed, 12 Oct 2005 21:35:25
- Simple answer:, Fred, Wed, 12 Oct 2005 19:00:40
- Re: PVC check valve. You guys sure about that one?, MS, Wed, 12 Oct 2005 10:09:42 <-- Viewing This Message
  - One more point that hasn't been discussed., Jeff Cunningham, Wed, 12 Oct 2005 13:12:42
  - Re: PVC check valve. You guys sure about that one?, JohnB, Wed, 12 Oct 2005 10:40:15
    - Re: what then, MS, Wed, 12 Oct 2005 14:06:31
      - I dunno....one on mine is capped off from factory,, JOhnB, Wed, 12 Oct 2005 15:13:47
        Re: I dunno....one on mine is capped off from factory,, Bill S., Wed, 12 Oct 2005 20:41:30
        Not true either, my N/A has both lines n/m, couch tour , Thu, 13 Oct 2005 13:07:46
        My apologies, you're right...., Bill S., Fri, 14 Oct 2005 02:19:49
- From my experiences..., Joe98, Wed, 12 Oct 2005 06:59:49
- PCV check valve, Bill S., Wed, 12 Oct 2005 01:33:14
  - If you look at the inside of the plastic turbo duct, >>, RS , Wed, 12 Oct 2005 06:11:28
    - Re: If you look at the inside of the plastic turbo duct, >>, Dan , Wed, 12 Oct 2005 16:50:25
    - Re: If you look at the inside of the plastic turbo duct, >>, Bill S., Wed, 12 Oct 2005 08:23:38
      - Re: If you look at the inside of the plastic turbo duct, RS , Wed, 12 Oct 2005 09:50:16
      - Re: If you look at the inside of the plastic turbo duct, >>, John Roberts, Wed, 12 Oct 2005 09:05:57
        Think about it this way..., Bill S., Wed, 12 Oct 2005 10:25:26
        Re: If you look at the inside of the plastic turbo duct, RS , Wed, 12 Oct 2005 10:00:52
        Re: If you look at the inside of the plastic turbo duct, John Roberts, Wed, 12 Oct 2005 11:37:55
        Re: If you look at the inside of the plastic turbo duct, John Roberts, Wed, 12 Oct 2005 13:25:18
        So you're saying that..., Bill S., Wed, 12 Oct 2005 13:42:29
        Re: So you're saying that..., John Roberts, Wed, 12 Oct 2005 15:02:44

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