Jim:
The 1969-74 1275 engines did not use the large diaphragm style PCV valve
found on earlier cars. Your earlier description of what you had left of the
system is all that should be needed to properly evacuate the crankcase of
fumes. There should be a hose from the timing cover oil separator to a "Y"
leading to the metered vacuum source at the base of the SU carburetors.
This system requires the use of a NON-Vented oil cap. Using a vented cap
will result in oil being drawn through the system, and a lean air-fuel
mixture (increased idle speed, misfire under medium load, higher than normal
operating temps, etc.)
David Riker
63 Falcon
70 Torino
74 Midget
http://home.pacbell.net/davriker/
----- Original Message -----
From "Jim Juhas" <james.f.juhas at snet.net>
To: "gerard" <pixelsmith@gerardsgarage.com>
Cc: "James Algar" <jamesa@HI-TORQUE.com>; <spridgets@autox.team.net>
Sent: Wednesday, June 11, 2003 6:49 AM
Subject: Re: 1969 Sprite PCV valve
> Gerard:
>
> So, utilizing the system that feeds via a tube from the front cover (or in
the
> case of my MGB, the side cover) to the carburetor bodies, it would be a
good
> thing to insert a conventional PCV valve in that line in lieu of the much
more
> expensive original valve that mounts to the manifold?
>
> gerard wrote:
>
> > I would and do. You want to prevent and unburned gasses from going
> > the other way in the case of a backfire, for instance. The PCV valve
> > closes if the pressure reverses.
> >
> > Gerard
> >
> > At 5:39 PM -0700 6/10/03, James Algar wrote:
> > > The only crankcase ventilation still in
> > >place is a hose off the timing cover can, which runs to a black plastic
> > >T-fitting which splits and runs to the carburetor bodies, just under
the
> > >dashpots, before the butterflies. This, I think, is original.
So...should I
> > >find and re-install a PCV valve on a (non-T) fitting back into the
blanked
> > >off manifold port?
> > >
> > >Jim Algar
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