 Correct main jet for Weber dual 40's |
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| motomoss |
  Feb 15 2016, 12:34 PM
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#1
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Newbie  Group: Members Posts: 4 Joined: 1-July 12 From: New Buffalo MI Member No.: 14,620 Region Association: None  |
Hello, I currently have 1974 2.0 and am thinking on purchasing a big bore kit for it. I have a set of Weber dual 40's and distributor set up for carbs that I will be using on the car but do not know the correct main jet size for the carbs (IMG:style_emoticons/default/confused24.gif) . Any help would be much appreciated.
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Replies(1 - 3)
| Starlack |
Feb 15 2016, 01:22 PM
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#2
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Member Group: Members Posts: 67 Joined: 8-January 12 From: Germany Member No.: 13,978 Region Association: None |
QUOTE(motomoss @ Feb 15 2016, 10:34 AM)  Hello, I currently have 1974 2.0 and am thinking on purchasing a big bore kit for it. I have a set of Weber dual 40's and distributor set up for carbs that I will be using on the car but do not know the correct main jet size for the carbs (IMG:style_emoticons/default/confused24.gif) . Any help would be much appreciated. Hello I have documents from a German engine builder. Porsche 914 Venturies 30mm Mixing tube F11 Main Jet 125 Idling jet 55 Regulating nozzle 180 evtl.200 hope to have helped |
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| Elliot Cannon |
Feb 15 2016, 05:45 PM
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#3
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914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None 
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QUOTE(Starlack @ Feb 15 2016, 11:22 AM) QUOTE(motomoss @ Feb 15 2016, 10:34 AM) Hello, I currently have 1974 2.0 and am thinking on purchasing a big bore kit for it. I have a set of Weber dual 40's and distributor set up for carbs that I will be using on the car but do not know the correct main jet size for the carbs (IMG:style_emoticons/default/confused24.gif) . Any help would be much appreciated. Hello I have documents from a German engine builder. Porsche 914 Venturies 30mm Mixing tube F11 Main Jet 125 Idling jet 55 Regulating nozzle 180 evtl.200 hope to have helped This might be a good place to start but depending on engine size you might have to do a little experimenting with jet combinations |
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| jmill |
Feb 15 2016, 06:29 PM
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#4
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
It's an air correction jet instead of a regulating nozzle here in the States. Buy the weber tech manual by Bob Tomlinson. Read it until you understand how the carb works. I had to read it several times before i wrapped my head around all of it.
You'll need to buy a carb cam too. Otherwise you won't be pleased with the performance. |
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