 Weber Carb Restore Questions, Manifold preferences, Manual Choke, etc.. |
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| Literati914 |
 Aug 5 2026, 07:13 PM
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Advanced Member  Group: Members Posts: 2,385 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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| Literati914 |
Aug 6 2026, 04:11 PM
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#2
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Advanced Member Group: Members Posts: 2,385 Joined: 16-November 06 From: Dallas, TX Member No.: 7,222 Region Association: Southwest Region |
QUOTE(porschetub @ Aug 5 2026, 11:31 PM)  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. Thanks for the info.. the pic below shows the large vacuum ports I’d mentioned. So I suppose if I pull a single vacuum from my other manifolds as you suggest, I’d need to tap in a small nipple for it? - I haven’t seen that before. Attached thumbnail(s) 
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Posts in this topic
Literati914 Weber Carb Restore Questions Aug 5 2026, 07:13 PM
dtmehall what kind of distirbuter? Aug 5 2026, 07:18 PM Literati914
what kind of distirbuter?
These are bigger port... Aug 5 2026, 08:01 PM porschetub the inlet manifolds you describe with the large va... Aug 5 2026, 10:31 PM 930cabman [quote name='Literati914' date='Aug 5 ... Aug 6 2026, 04:52 AM dtmehall i am running 40idf's on a 1.7, and it runs gre... Aug 6 2026, 03:28 PM Ninja You will want the smallest venturis available for ... Aug 6 2026, 04:18 PM Literati914
You will want the smallest venturis available for... Aug 6 2026, 04:26 PM dtmehall i am running 52 idles and 125 mains Aug 6 2026, 04:40 PM
porschetub
i am running 52 idles and 125 mains
I'am a D... Aug 6 2026, 09:36 PM dtmehall and 28 mm venturis Aug 6 2026, 04:41 PM Literati914
i am running 52 idles and 125 mains
and 28 mm ve... Aug 6 2026, 07:14 PM Literati914 Thanks again guys!
One set has what I guess i... Aug 7 2026, 02:24 PM porschetub
Thanks again guys!
One set has what I guess ... Aug 7 2026, 03:09 PM dtmehall no chokes on mine Aug 7 2026, 04:20 PM |
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