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Thread: Weber jetting 73s

  1. 08-06-2017, 09:23 AM #1
    gearjam
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    Weber jetting 73s

    I bought my car in 1987 and it didn't run right then. Fast forward to now and finally getting car together but runs bad so I want to send out injection pump and injectors to have them gone over. I would like to use webers that I have till I get injection back which could be winter. I have found info on jetting with 32 mm venturies but would like to use 34 because I have them. Its a total stock 73S with a stock muffler so anybody have jetting info it would be great. Thx
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  2. 08-07-2017, 02:52 PM #2
    edmayo
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    Since the larger venturi will delay the low pressure signal that allows fuel to be drawn from the emulsion tube usually a slightly larger main jet will be required, like from a 135 to a 140. In more extreme cases you might need a smaller air correction jet, but that's not likely for your application. There is a Weber graph that shows the theoretical size, but I don't have it here at home.
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