 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: 2,385 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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| dtmehall |
Aug 6 2026, 04:40 PM
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#2
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Member Group: Members Posts: 363 Joined: 21-December 23 From: Michigan Member No.: 27,808 Region Association: Upper MidWest |
i am running 52 idles and 125 mains
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| porschetub |
Aug 6 2026, 09:36 PM
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#3
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914 Guru Group: Members Posts: 5,174 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(dtmehall @ Aug 7 2026, 10:40 AM)  i am running 52 idles and 125 mains I'am a Dellorto guy but that sounds about right ,28mm vents provide great vacuum signal and response to assist early transition to main jets which IMO work well on a small displacement T4 .this will work well with the svda Pertronix dizzy you have. You will be drawing vacuum from one carb and not the manifold as you need a vacuum that is variable due to throttle position so the undrilled manifolds are your best choice as you mentioned you had a set . Cheers. |
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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 Literati914
the inlet manifolds you describe with the large v... Aug 6 2026, 04:11 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 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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