Date: Fri, 25 Oct 2002 09:41:37 GMT From: Paul Halliday <pjghnopsamyonder.co.uk> Subject: Re: PCV Valve on a 89 900 T16
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