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
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----- 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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