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Posted by: motomoss Feb 15 2016, 12:34 PM

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 . Any help would be much appreciated.

Posted by: Starlack Feb 15 2016, 01:22 PM

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 . Any help would be much appreciated.

Posted by: Elliot Cannon Feb 15 2016, 05:45 PM

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 . 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

Posted by: jmill Feb 15 2016, 06:29 PM

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.