This may be a silly question, but why not just put a breather in the valve
cover and forget about running it to the carb?
Chuck Pedretti
Senior Consultant
Magenic Technologies
http://www.oldjeep.com
-----Original Message-----
From: Joe Curry [mailto:spitlist@gte.net]
Sent: Friday, March 30, 2001 1:17 PM
To: Jeff McNeal
Cc: Vic Whitmore; Sizemore, Shane; Spitfires Maillist
Subject: Re: Weber DGV vacuum
Jeff and all,
The real problem in most cases is the 1500 was generally a closed breathing
system and the air pump was an integral part of that system. So when it
gets removed (as it generally does) you have to go back and examine one of
the earlier "open system" engines and basically copy what was done there.
If you don't, the built up pressure will vent anywhere it can and that
typically begins at the dipstick tube!
Joe
Jeff McNeal wrote:
>
> This may sound a bit silly, but do you think that the dipstick itself
might
> be your real problem? Does it fit really tight except for when the engine
> is running? I guess my point is this: If you're not having a blowby
> problem at the carb, and getting good airflow out the crankcase vent, then
> how could it be anything *but* the dipstick fitting that's causing the
> problem?
>
> Best wishes,
>
> Jeff in San Diego
>
> '67 RHD Spitfire Mk3 aka "Mrs. Jones"
> '68 LHD Spitfire Mk3 frame-off resto project
> Jeff's Classic '67 Spitfire Mk3 site & Vintage Spitfire Webring
> http://www.ohms.com/spitfire/spitfire.shtml
> home of the NEW Totally Triumph Auction
> "By Triumph enthusiasts, for Triumph enthusiasts"
> http://www.ohms.com/cgi-bin/TRauction.cgi
> and..The Totally Triumph Garage forums -- moderated, focused, friendly!
> http://www.ohms.com/cgi-bin/dcforum/dcboard.cgi
> ...plus a few other surprises!
>
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>
> ----- Original Message -----
> From: "Vic Whitmore" <vicwhit@home.com>
> To: "Jeff McNeal" <jmcneal@ohms.com>
> Cc: "Sizemore, Shane" <Shane.Sizemore@per-se.com>; "Spitfires Maillist"
> <spitfires@autox.team.net>
> Sent: Friday, March 30, 2001 9:36 AM
> Subject: Re: Weber DGV vacuum
>
> >
> > Yup. I connect the hose from the valve cover to the plastic angle
> connector on
> > the under side of the air filter. I used the same hose as the ZS and it
> has no
> > blockage. Not much oil appears in the carb but it sure makes a mess
around
> the
> > dip stick. This is just sitting in the garage, revving the engine to
road
> RPMs.
> >
> > Vic W.
> >
> > Jeff McNeal wrote:
> > >
> > > Just so I understand what's happening here... You say that when you
> > > connected the venting hose to the plastic angle connector that snaps
to
> the
> > > underside of the air cleaner plate on the DGV, you get oil all over
the
> > > place at the carb AND the dipstick blows out as well? Are you sure
you
> > > don't have a blockage of some sort in the vent hose? By the way,
> you're
> > > going to love the Pierce manifold. Works great.
> > >
> > > Best wishes,
> > >
> > > Jeff in San Diego
> > >
> > > '67 RHD Spitfire Mk3 aka "Mrs. Jones"
> > > '68 LHD Spitfire Mk3 frame-off resto project
> > > Jeff's Classic '67 Spitfire Mk3 site & Vintage Spitfire Webring
> > > http://www.ohms.com/spitfire/spitfire.shtml
> > > home of the NEW Totally Triumph Auction
> > > "By Triumph enthusiasts, for Triumph enthusiasts"
> > > http://www.ohms.com/cgi-bin/TRauction.cgi
> > > and..The Totally Triumph Garage forums -- moderated, focused,
friendly!
> > > http://www.ohms.com/cgi-bin/dcforum/dcboard.cgi
> > > ...plus a few other surprises!
> > >
> > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> > >
> > > ----- Original Message -----
> > > From: "Vic Whitmore" <vicwhit@home.com>
> > > To: "Sizemore, Shane" <Shane.Sizemore@per-se.com>
> > > Cc: "Spitfires Maillist" <spitfires@autox.team.net>
> > > Sent: Friday, March 30, 2001 9:05 AM
> > > Subject: Re: Weber DGV vacuum
> > >
> > > >
> > > > The aluminum valve cover has a similar outlet to the standard cover
so
> I
> > > don't
> > > > see how it would change things. In fact it may be worse. The
aluminum
> > > cover does
> > > > not have any baffle on the inside like the standard one.
> > > >
> > > > Vic W.
> > > >
> > > > "Sizemore, Shane" wrote:
> > > > >
> > > > > I thought the aftermarket aluminum style valve covers with
breathers
> > > took
> > > > > care of this issue?
> > > > >
> > > > > Anyone using them?
> > > > >
> > > > > -----Original Message-----
> > > > > From: Jeff McNeal [mailto:jmcneal@ohms.com]
> > > > > Sent: Friday, March 30, 2001 11:35 AM
> > > > > To: Vic Whitmore; Spitfires Maillist
> > > > > Subject: Re: Weber DGV vacuum
> > > > >
> > > > > I'm not sure why my high compression 1296 engine (9.0:1) doesn't
> have a
> > > > > problem, but I have the crankcase ventilation connecting to the
top
> > > plate of
> > > > > my Weber DGV as designed and have no problems with excessive oil
> blowby
> > > > > whatsoever...
> > > > >
> > > > > Best wishes,
> > > > >
> > > > > Jeff in San Diego
> > > > >
> > > > > '67 RHD Spitfire Mk3 aka "Mrs. Jones"
> > > > > '68 LHD Spitfire Mk3 frame-off resto project
> > > > > Jeff's Classic '67 Spitfire Mk3 site & Vintage Spitfire Webring
> > > > > http://www.ohms.com/spitfire/spitfire.shtml
> > > > > home of the NEW Totally Triumph Auction
> > > > > "By Triumph enthusiasts, for Triumph enthusiasts"
> > > > > http://www.ohms.com/cgi-bin/TRauction.cgi
> > > > > and..The Totally Triumph Garage forums -- moderated, focused,
> friendly!
> > > > > http://www.ohms.com/cgi-bin/dcforum/dcboard.cgi
> > > > > ...plus a few other surprises!
> > > > >
> > > > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Vic Whitmore" <vicwhit@home.com>
> > > > > To: "Spitfires Maillist" <spitfires@autox.team.net>
> > > > > Sent: Friday, March 30, 2001 6:29 AM
> > > > > Subject: Weber DGV vacuum
> > > > >
> > > > > >
> > > > > > I'll be installing a Weber DGV onto my 76 Spitfire in the next
few
> > > weeks
> > > > > and I
> > > > > > need some insight from those that have "ben there, dun that". I
am
> > > aware
> > > > > that
> > > > > > the positive crankcase pressure is not relieved by connecting
the
> hose
> > > > > from the
> > > > > > valve cover to the air filter connection. The result is oil
> pushing
> > > out
> > > > > through
> > > > > > the dip stick.
> > > > > >
> > > > > > On the ZS, this isn't a problem because the hose from the valve
> cover
> > > is
> > > > > > connected to a high vacuum port on the carb which relieves the
> excess
> > > > > pressure.
> > > > > >
> > > > > > It would be nice if the DGV had a similar port but that doesn't
> appear
> > > to
> > > > > be the
> > > > > > case. Is it possible to add a port by opening up an existing but
> > > blanked
> > > > > out
> > > > > > port, or adding a completely new one? I would suspect that if
this
> > > were
> > > > > possible
> > > > > > the jets/needles would have to be changed and I am prepared for
> that
> > > > > > eventuality.
> > > > > >
> > > > > > Failing the vacuum port, my last resort is to use a catch can
(way
> > > down at
> > > > > the
> > > > > > bottom of the list) which is vented to the air filter. Some
people
> > > have
> > > > > > fashioned a connection to a blanked off plate where the fuel
pump
> goes
> > > and
> > > > > they
> > > > > > use an electric fuel pump. Since I use a mechanical pump, where
is
> the
> > > > > best
> > > > > > place to vent the crankcase?
> > > > > >
> > > > > > Vic Whitmore
> > > > > > 76 Spitfire
> > > > > > Thornhill, Ontario
> > > > > >
> > > > > > http://www.vicwhit.com
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