 Weber Carb Restore Questions, Manifold preferences, Manual Choke, etc.. |
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| Literati914 |
 Aug 5 2026, 07:13 PM
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#1
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Advanced Member  Group: Members Posts: 2,365 Joined: 16-November 06 From: Dallas, TX Member No.: 7,222 Region Association: Southwest Region  |
I'm going to restore (try to) a set of Italian Weber 40idf carburetors to put on a 1.7 engine. I have two sets of manifolds... one set has a vacuum port on one runner (each side of engine), and the other has none at all. Is one type favored?
Which do I want to use, and why? - I have no idea what the vac ports would connect to. If they help even out idle, I'd want them I guess. Thoughts? |
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Replies(1 - 4)
| dtmehall |
Aug 5 2026, 07:18 PM
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#2
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Member Group: Members Posts: 334 Joined: 21-December 23 From: Michigan Member No.: 27,808 Region Association: Upper MidWest |
what kind of distirbuter?
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| Literati914 |
Aug 5 2026, 08:01 PM
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#3
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Advanced Member Group: Members Posts: 2,365 Joined: 16-November 06 From: Dallas, TX Member No.: 7,222 Region Association: Southwest Region |
QUOTE(dtmehall @ Aug 5 2026, 08:18 PM)  what kind of distirbuter? These are bigger ports on the manifolds than typical of a vacuum port on a distributor.. (IMG:style_emoticons/default/idea.gif) But to answer the question, I have not really thought about it - I do have a Pertronix Flamethrower SVDA in a box somewhere, so probably that. |
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| porschetub |
Aug 5 2026, 10:31 PM
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#4
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914 Guru Group: Members Posts: 5,149 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
the inlet manifolds you describe with the large vacuum fittings would have been used on a t4 VW bus most likely ,they are there for power brake servo so not needed the plain ones will be fine on a 914.
Pick up vacuum from one carb with the SVDA dizzy and you will be fine and block off the unused one on the other carb ,just make sure the carbs have 28mm vents and moderate jetting for a 1.7 otherwise it will run like (IMG:style_emoticons/default/stromberg.gif) ,cheers. |
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| 930cabman |
Aug 6 2026, 04:52 AM
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#5
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Advanced Member Group: Members Posts: 4,776 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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[quote name='Literati914' date='Aug 5 2026, 07:13 PM' post='3267680']
I'm going to restore (try to) a set of Italian Weber 40idf carburetors to put on a 1.7 engine. I have two sets of manifolds... one set has a vacuum port on one runner (each side of engine), and the other has none at all. Is one type favored? Which do I want to use, and why? - I have no idea what the vac ports would connect to. If they help even out idle, I'd want them I guess. Thoughts? [/quote my first thought is, too much carbs for a 1.7? I am running a set on my 2056 and are working very well. Too much carb volume is generally not good. Maybe source a set of early single throat carbs so far as the rebuild process, it's like anything else, do your research, take your time, measure twice (or more) cut once |
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