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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