Alfa Romeo Forums banner
1 - 4 of 4 Posts

· Registered
Joined
·
1 Posts
Discussion Starter · #1 ·
Need some advice.

I have a '67 Duetto and I want to put some new or refurb carbs on it. One is broken internally (the support for the float) and I'm not sure they match as they should.

I found three options and need help choosing. I'm not very knowledgeable on webers at all.

The current Carbs are not identical.
  • 40 DCOE 27
  • 40 DCOE 4 no 15913

The three options I'm looking can be jetted appropriately for the 1600 (or so they say).

OPTION 1: 40 DCOE 2 Italian webers off of used on Alfa Romeo Giulietta Sprint Veloce and Alfa Romeo Giulia 1600 Super Sport

OPTION 2: Reconditioned Italian Weber 40 DCOE 31 , original fitment on Lotus Cortina and Elan 1600cc

OPTION 3: new, made in Spain Weber 19550.174 40 DCOE 151
Std jetting is
30mm venturi / choke
115 main jet
F11 emulsion tube
200 air corrector jet
50 pump exhaust valve
45F9 idle jet
40 pump jet
1.75 needle valve.​

I'm inclined to go with the 40 DCOE 2's only because they were on an Alfa 1600 originally, but perhaps that is not important?

Any advice would be much appreciated!
 

· Administrator
Joined
·
13,149 Posts
My guess is the Weber bodies are both 27's and one top has been replaced. Have the 27's restored and keep the car correct.
 

· Administrator
'66 Sprint GT, '67 Duetto, '70 BMW 2800CS
Joined
·
13,368 Posts
I'm inclined to go with the 40 DCOE 2's only because they were on an Alfa 1600 originally, but perhaps that is not important?
It is important to use carbs that have a choke size, and jetting that is consistent with a 1600 cc engine. However, since all 40 mm DCOE's can be re-choked and re-jetted as needed, that doesn't mean that the DCOE 2's are somehow better.

OPTION 3: new, made in Spain Weber
I would avoid the new, Spanish-made carbs. The quality is better on the older, Italian-made ones.

It is always a good idea to follow Gordon Raymond's advice (see post #2 above). Have a Weber specialist verify that both of your carb bodies are DCOE 27's - they probably are, and as Gordon suggested, someone just substituted a DCOE 4 top because the float mount was broken on the original top.
 
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top