all this talk about venting i just looked at my weber and intake that's
going on the 1500 that i'm building and i'm going to drill and tap a pcv
valve into it and be done with it
----- Original Message -----
From: "Joe Curry" <spitlist@gte.net>
To: <spitfires@autox.team.net>
Sent: Saturday, March 31, 2001 12:46 AM
Subject: Re: 1500 Venting
>
> Trevor Boicey wrote:
> >
> > Vic Whitmore wrote:
> > > The whole issue centres around the use of the Weber DGV (and as Joe
> pointed out
> > > the DCOE). It does not have the same vacuum port as in the standard
> carb, the
> > > ZS. It has only one vacuum attachment and that is used for the
> distributor.
> >
> > Agreed, you cannot use ported vacuum for this job for
> > the reasons you talk about. However, there are other sources of
> > vacuum to be had.
> >
> > Have you checked the manifold?
> >
> > I have done this exact job on two DCOE webers, and both
> > had extra ports on the manifold available to be used. It
> > seems these manifolds are sort of "generic" so they
> > come with blocked off ports that you can use in
> > certain applications and ignore in others.
> >
> > I had a Dellorto DCOE clone for A-series Midgets, here's a picture:
> >
> > http://www.brit.ca/~tboicey/mgparts/pics/midget_dellorto_carb_1.jpg
> >
> > ...there is a capped port on the manifold, visible on the left
> > side of the picture. It's a simple matter of unscrewing
> > the blanking plate, and screwing in a vacuum tap from your
> > local PEP boys.
> >
> > I don't have pictures, but I did a similar job on a DCOE
> > for a friends MGB. That manifold already had a vacuum port
> > actually, it was capped off with a rubber seal that just
> > needed to be cut open and removed.
> >
> > The UK spec dual-SU manifold also has a plugged port:
> >
> > http://www.brit.ca/~tboicey/midget/pics/midget_overdrive_day_five_5.jpg
> >
> > In these applications, I would usually plumb in a $5 PCV
> > valve instead of a restrictor. It gives an extra safety
> > margin, because the manifold vacuum can get so high at cruise
> > and idle, and this way it will only flow air when the
> > crankcase pressure is above ambient air pressure.
>
>
> And you knock me for "Jury Rigging"!!!!! Oh I forgot, in your case it is
> "Engineering"!
>
> >
> > > Just try removing the hose from the valve cover and run like that for
> > > a while. I will guarantee that you will get the same problem, oil
> pumping out
> > > the dip stick.
> >
> > I'll happily take that bet. With the crank open through
> > the valve cover, no pressure will build to pop out the
> > dipstick.
>
> This is exactly the situation that caused me to seek a better solution. I
> had a vented oil cap and
> the valve cover was open to the atmosphere and
> still the oil poured out. Trevor, that is one bet you will surely lose!!!
>
> Joe
|
