Jim Goodwin wrote:
>
> Tony, The 32/36 mm DGV and the 5200 Motorcraft are interchangable.
Hi Jim et al,
Thanks for the MGB reference article on carburetors at
www.mgbmga.com/tech/mgb19.htm. Very interesting about the 2bbl Weber
mid-range problems.
To those reading along, this project is about putting a TR3 in a flat
rad Morgan and not modifying the bonnet with an air scoop which would be
a necessity if retaining the SU carbs and TR3 manifold (even short
carbs, short manifold). I now have an intake manifold that works with a
32/36 DGV Weber and everything including an air filter will fit under
the bonnet.
The manifold came from Pierce Manifolds in Gilroy, CA. It was
originally for a Volvo. The mounting flanges had been cut off in
preparation for a project which was dropped. The port to port spacing
was OK for the outer ports, but 1/2 in too short for the inner ones. I
cut new flanges, angled the inner ports and had them welded on.
I went to the salvage yard and bought a Pinto carburetor for $20. It
seems to be the Motorcraft 5200 according to the pictures in my Pinto
book. Comparing it to a 32/36DGV (which I own) I note the following
differences. The square inlets at the top are smaller (1.5 in. sq. for
the Pinto and 1.75 in. sq. for the DGV). The primary and secondary
venturi are reversed. In fact the Pinto carburetor is a mirror image of
the DGV. Perhaps it's based on the DFV. Looking at the throttle
linkage side the primary venturi is on the left on the Pinto and the
throttle rotates counter-clockwise to open. Vice-versa for the DGV.
The accelerator pump is on the left on the Pinto, on the right on the
DGV. The flange where the air filter mounts is a different shape; on
the DGV it's sort-of recangular with rounded corners, on the Pinto it's
more oval with a V section toward the float side, two studs on the
Pinto, 4 on the DGV. The choke bores are the same, 32 and 36 mm.
There's an electrically operated solenoid valve mounted to the top
corner of the float lid. It operates a plastic flapper that opens an
air port. I have no idea what that does. Any hints? My Pinto book
only covers up to model year 1977. This must be a later gimmick,
probably for smog control. Another problem is the throttle linkage hits
the manifold, even adding an insulator block the carb is too low. I
guess I could fix all these things, but it will be simpler and I think
I'll be better off with a real DGV even at the $100+ price. Maybe
somebody has a spare they can sell to me.
Regards, Tony Souza
|