 twin carb vac take off |
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| JFG |
 Sep 28 2017, 08:29 AM
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#1
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Senior Member  Group: Members Posts: 686 Joined: 7-April 16 From: Wales Member No.: 19,869 Region Association: None  |
I have twin weber 40idfs to fit and an 034 svda distributor for ignition. When i set my float heights last night i found the vac advance ports on the carbs have a blanking screw instead of a take off tube.
I can't remember my last twin carb air cooled set up so was wondering do i need to take off both carbs or will one work properly? What have you done with your same carb/dizzy set up? |
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| nditiz1 |
Sep 28 2017, 11:30 AM
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#2
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Senior Member Group: Members Posts: 1,193 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region 
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QUOTE(JFG @ Sep 28 2017, 06:29 AM)  I have twin weber 40idfs to fit and an 034 svda distributor for ignition. When i set my float heights last night i found the vac advance ports on the carbs have a blanking screw instead of a take off tube. I can't remember my last twin carb air cooled set up so was wondering do i need to take off both carbs or will one work properly? What have you done with your same carb/dizzy set up? Use the vacuum port on cyc barrel #4. It is located here in green: Also, recommended is an anti pulse valve. It smooths the vac adv. They can be purchased from Aircooled.net. The Bob Tomlison Weber book talks about it.  |
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| porschetub |
Sep 28 2017, 01:29 PM
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#3
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Advanced Member Group: Members Posts: 4,708 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(nditiz1 @ Sep 29 2017, 06:30 AM) QUOTE(JFG @ Sep 28 2017, 06:29 AM) I have twin weber 40idfs to fit and an 034 svda distributor for ignition. When i set my float heights last night i found the vac advance ports on the carbs have a blanking screw instead of a take off tube. I can't remember my last twin carb air cooled set up so was wondering do i need to take off both carbs or will one work properly? What have you done with your same carb/dizzy set up? Use the vacuum port on cyc barrel #4. It is located here in green: Also, recommended is an anti pulse valve. It smooths the vac adv. They can be purchased from Aircooled.net. The Bob Tomlison Weber book talks about it. Dellorto's only have one port if the were used on Alfa's and the factory fitted the valve you speak of, not sure if the Webers ever had provision for that area in the casting to be drilled ,this can be done on the Dellorto's however. I researched this on a UK bus website and to be honest I didn't know of this and always thought you could run off one vacuum point,ran single throat ICT's on my buggy with one pickup and it ran fine. |
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Posts in this topic
JFG twin carb vac take off Sep 28 2017, 08:29 AM
JFG Thanks for that. I was looking at the 2 small scre... Sep 28 2017, 01:28 PM r_towle If you merge the two carbs with a t-fitting before... Sep 28 2017, 03:07 PM Perry Kiehl I ran both to a T and also added an anti-pulse val... Sep 28 2017, 04:50 PM nditiz1 I originally had just a T. John from ACN told me ... Sep 28 2017, 05:16 PM
porschetub No personal experience but research indicated port... Sep 28 2017, 06:16 PM |
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