That's strange. Neither of my running 8V NA C900's have PCV's in the
cylinder head breather line, but since Saab made 8V C900's right up until
1988 or 1989, they might have been fitted on cars made in the last few years
for all models (not just those with turbo's)? Just a thought.

But the question is then why would a non-turbo 8V engine need a PCV - anyone
privy to inside Saab design knowledge of the mid to late 1980's able to shed
some light on this?

One possibility - the engine might have originally been fitted with a turbo
but had it removed even though the PCV was left in. This sounds fairly
unlikely but it is a possibility.

Craig.

Are we talking about the same thing?
This is a PCV (positive crankcase ventilation) check valve;
http://members.home.nl/mhilvers/pcvcheckvalve.jpg
from my previous '87 900T8. (It's about 4 cm long x 1.5 cm wide, maybe a 1
euro part.)

My current '91 900i/16 non turbo, has no PCV valve, there is no need for it
as there is always partial vacuum in the inlet manifold, contrary to a turbo
where there may be overpressure. For the PCV to work, there must be a check
valve in the vacuum line to prevent boost pressure getting under the valve
cover and into the crankcase.

My 900i actually has two vacuum lines; one thick one from the valve cover to
just before the throttle opening, and a thin one from the valve cover to the
inlet manifold. Both lines share the valve cover connection. The thin line
shares the manifold connection with the line to the carbon cannister.

--
MH
'72 97 '77 96 '78 95 '79 96
'91 900i 16
http://go.to/saab96