Date: Fri, 25 Oct 2002 06:30:56 -0400 From: KeithG <noonenopsamspring.com> Subject: Re: PCV Valve on a 89 900 T16
I do not know for sure what is proper for a Saab, but these values seem very reasonable to me. I do not know what an aftermarket PCV could do to help your cause. KeithG Paul Halliday wrote: > in article ap3l1g$9mg$1nopsam.atl.mindspring.net, KeithG at > noonenopsamspring.com wrote on 22/10/2002 14:49: > > >>Paul, >> >>Saabs do not use PCV 'valves', but crankcase vent elbows. The old spring >>loaded PCV valve was not used on a saab 900. On a turbo, the small >>vacuum line needs a checkvalve (any will do as long as it can handle >>about 1 bar or so) to keep from pressurizing the crankcase. That is all >>there is to it. The large pipe goes to a port in FRONT of the throttle >>plate and the small vacuum line goes to the intake manifold. Any >>'performance PCV valve' ia a ruse. > > > Keith, > > I've cleaned out the plastic junctions (they get a bit grogged up with stuff > now and again) and replaced these pipes before. I had an inkling about the > purpose of these pipes, so thanks for the confirmation. I had done some > other stuff on the vac system at the same time, so couldn't be sure what bit > of tinkering had made which effect :) > > >>Any 'performance PCV valve' is a ruse. The 8VT may be a little different, >>and it may have changed for EU spec cars to be identical to the 16V as I >>do not see why the same parts would not work. > > > My setup is as you describe. > > I therefore take it that so long as these pipes are performing their duty > correctly, I should see lower oil pressure - say, 50-70 psi under > load/charge and around 30 psi at rest? This is what I saw once the pipes and > bits had been cleaned/replaced. My oil pressure gauge showed around 70+ psi > under load and around 50 psi, stuttering down to 30 psi, at rest beforehand. > > No need for an after-market PCV then? > > Cheers, > > Paul > > 1985 900i 16V > 1989 900 Turbo S > http://pjgh.go.dyndns.org/saab/index.html >
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