Weber Tuning and Repair

[Rallye Sport]

With most small Fords using Weber carburetors I thought it might be useful to start a thread to gather some information resources in relation to these carbs.

Your contribution and experiences are welcome.

Tuning and repair of Webers is a skilled but dying art, however it is within the capabilities of the DIY mechanic and the results can be quite rewarding.

Standard disclaimer though, do your research, make up your own mind and consult a professional if you can't apply either of these steps.

[Rallye Sport]

Weber types

Firstly a couple of definitions.

Venturi- opening for air inlet.

Dual stage- Venturi's opening at different times in the throttle phase.

Single stage- Venturi's opening in unison.

Downdraught- Air drawn in vertically.

Sidedraught- Air drawn in horizontally.

Weber DCD

Type- Dual stage Downdraught
Venturi size- 28/36
Found on- Mk1 Cortina GT 'Kent' 1500cc



Weber DGV

Type- Dual stage Downdraught
Venturi size- 32/36
Found on- Mk2 Cortina GT, Mk2 Escort 'Kent' 1600cc



Weber DGAV

Type- Dual stage Downdraught
Venturi size- 32/36
Found on- Cortina Escort 'Pinto' 2000cc



Weber DGAS

Type- Single stage Downdraught
Venturi size- 38/38
Found on- Capri 'Essex' 3000cc *Will also fit DGAV manifold



Weber IDF

Type- Single stage Downdraught
Venturi size- 44/44
Found on- Euro spec Mk2 Escort Group 1 option



Weber DCOE

Type- Single stage Sidedraught
Venturi size- 40/40, 45/45
Found on- Aftermarket fittment

[simon varley]

I rebuilt my DFM service kits are pretty cheap

[oldel]

Love the weber carb. I usually used IDA and IDF on rotaries but on a spare mazda 808 with a 1600 piston engine I played around with fitting a 32/36 dgv.

Webers are simple to set up (I shudder at holleys and other similar 4 barrels used on V8s or SUs and the like -can't know everything, pick one). The simple brass idle, air, fuel jets and emulsion tubes of webers and their circuits I learnt quick enough.

I did muck around a bit on the 4 barrels rotaries used (hitachi and nikki), but too hard to mod - get a weber instead.

Here's something I found on the net a while back
http://240260280.com/Tech/Carbs/Webe...ing%201976.pdf

https://www.lainefamily.com/images/W...ningManual.pdf


As usual I found it linked from a rotary site - old rotors remain popular so mostly their sites stay up, but carbs and old 4cyl websites are a dying breed, so if looking for weber info search for mazda rotary websites (E: of course they'e not going to have much on dvg or dcoe as they're mainly IDA, but often can point you to general parts and info weber sources

[chappy60]

the Mk GT cortina had a 32dfm carby
the essex started with 40 down draft
later went to a 38. Haynes put out a
manual for the weber carbs

[Capriman]

A small correction, the DFAV 40 was used on all Australian assembled Capri GT V6 3-litre models, through to November, 1972, when assembly ceased. The DGAS was used on UK built V6 Capri's from late 1971, but not in Australia, except on the 50 fully imported RS3100s.

[chappy60]

Both my cars are uk built the crayford corsair has the DFAV
and my Scimitar has the DGAS out the 2 i do prefer the 38
but in saying that one is oval port and the other is a d port and
they are built differently spec wise and they are like chalk and
cheese on how they perform

[Linz]

Very familiar with the Webers, did a few conversions on unsuspecting cars over the years
Most notable was a DGAV 32/36 on a 1980 Subaru Leone 1600, replaced the asthmatic Nikki carb...needed an adaptor plate to fit, had it dyno tuned and distributor recurved, geez did that wake the Suby up.
Used to blow away 253 HQ's with ease