I have always thought of the PCV as sort of a variable valve.
----- Original Message -----
From: "David Read" <daveread@dove.net.au>
To: <buick-rover-v8@autox.team.net>
Sent: Sunday, October 28, 2001 5:30 PM
Subject: Re: Help With PCV setup for Rover V8
> I could be wrong here, but ....
> I thought the purpose of the PCV valve was to prevent crancase fumes
> polluting the atmosphere by allowing diluting air in but not out except
> by means of an alternative path into the engine's cylinders.
> I agree that the outlet via carby/inlet manifold must be controlled, but
> mixture adjustments are made with this system in operation and should
> compensate.
>
> PCV valves are a simple ball/needle and seat type one way valve ....
> No rocket science used here <g>.
>
> Cheers
> Dave
> daveread@dove.net.au <RIP 8Nov01>
> South Australia
>
> ----- Original Message -----
> From: "David Kernberger" <dkern@napanet.net>
> To: "bown" <bown@concentric.net>
> Cc: <buick-rover-v8@autox.team.net>
> Sent: Monday, October 29, 2001 9:16 AM
> Subject: Re: Help With PCV setup for Rover V8
>
>
> > Jim et al.
> >
> > I think you have hit the nail on the head. The only purpose of the
> > Positive Crankcase Ventilation valve (PCV valve) is to restrict
> suction
> > applied to the crankcase under conditions of high intake manifold
> vaccuum
> > but to remove all such restriction when manifold vaccuum is low. Too
> much
> > air and crankcase vapors entering the engine under high vacuum
> conditions
> > would unnecesssarily dilute the air/fuel mixture and rob the engine of
> its
> > full power potential.
> >
> > Conditions of high manifold vacuum typically include idle, downhill
> > deceleration, and to a lesser extent, any light load part-throttle
> > operation. Low manifold vacuum usually occurs when the throttle is
> fully
> > open, or nearly so, such as during sustained heavy pulling or rapid
> > accleration. Hope I am not talking down to anybody here.
> >
> > Cheers,
> >
> > David Kernberger
> >
> > -------------------------------------------------------
> >
> > >I have an Edelbrock 4-Barrel and am using the PCV port (center and
> large
> > >port). It seems to work fine. I wonder if John might have had a
> defective
> > >PCV (valve) that was allowing excessive flow?
> > >Regards,'
> > >Jim B.
> > >
> > >
> > >----- Original Message -----
> > >From: "John Elliott" <john@elliottjohn.fsnet.co.uk>
> > >To: "Don S" <goldtr8@nconnect.net>
> > >Cc: <buick-rover-v8@autox.team.net>
> > >Sent: Saturday, October 27, 2001 7:11 PM
> > >Subject: Re: Help With PCV setup for Rover V8
> > >
> > >
> > >> I have an edelbrock 500 (aka weber 500) on an edelbrock performer
> > >manufold.
> > >> The edelbrock has a pcv port (the centre and largest of the vacuum
> ports)
> > >> but when I used it there was so much suck that the engine inflow
> (the
> > >small
> > >> tube on the other rocker cover) was actually whistling. Now I have
> the
> > >> breather connected to the spigot on the low rider manifold and this
> works
> > >> fine on an engine in good condition
> > >> John Elliott
> > >> TR7 FHC Russet Brown
> > >> 3.9/edelbrock 500/GM180 almost back on the road
> > >> TR7/8 Registrar
> > >> TR Register UK
> > >> www.tr-register.co.uk
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