 Weber 40 IDF help, My usual guy had back surgery and can't help now |
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| mmichalik |
 Apr 17 2025, 07:12 PM
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MikeM  Group: Members Posts: 759 Joined: 27-January 16 From: Valley Center, CA Member No.: 19,600 Region Association: Southern California 
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Hi everyone,
My 75 is ready to drive again. I fixed the oil leak from the main seal a couple of weeks ago and all is good. As I continue to do the shake out of the car, since I'm on the tail end of the restoration, I've had one problem the entire time and I need to get it fixed now. Cold or hot, as I'm driving there's a flat spot when I shift between gears. It bogs and then picks up again. It's particularly noticeable from 1st to 2nd and 2nd to 3rd. Sometimes even when starting for a dead stop. I know NOTHING about carbs but I'm willing to jump in. Does anyone have any experience with these symptoms? Is there a write up on the world that I've missed? Would anyone be willing to work for high end craft beer and good pizza (along with an hourly rate) (IMG:style_emoticons/default/smile.gif) I'm in north county inland San Diego (Valley Center) Mike |
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| Superhawk996 |
Apr 18 2025, 11:07 AM
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914 Guru Group: Members Posts: 7,044 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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One thing that is critical to tuning IDF’s is to understand the transition ports and that in light throttle / light load you are running on the idle circuit and transition ports more so than the mains.
 Take the time to read the Weber tuning manual to get a baseline understanding of the transition ports. The manual isn’t specific to IDF but the principles are the same. https://www.lainefamily.com/images/WeberTuningManual.pdf |
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Posts in this topic
mmichalik Weber 40 IDF help Apr 17 2025, 07:12 PM
technicalninja First thing I'd check is if the accelerator pu... Apr 17 2025, 07:23 PM Superhawk996 What are you using for ignition? The reason I ask ... Apr 17 2025, 10:31 PM
mmichalik
What are you using for ignition? The reason I ask... Apr 17 2025, 11:00 PM porschetub
Hi everyone,
My 75 is ready to drive again. I fi... Apr 17 2025, 10:49 PM mmichalik
Hi everyone,
My 75 is ready to drive again. I f... Apr 17 2025, 11:10 PM nditiz1 So 2 things will be needed, 1 of which is easy and... Apr 18 2025, 05:24 AM Superhawk996
The 2nd item that is needed is an AFR gauge.
A... Apr 18 2025, 05:48 AM 930cabman
The 2nd item that is needed is an AFR gauge.
... Apr 18 2025, 09:51 AM densible1 From my experience with 44 idf's and a bluetoo... Apr 18 2025, 10:49 AM nditiz1 A great tip that John from ACN told me was to remo... Apr 18 2025, 11:31 AM dtmehall did the car ever run correctly with the webers and... Apr 18 2025, 12:45 PM flxzcat Drilling new progression holes is a last resort an... Apr 18 2025, 04:26 PM Superhawk996
Drilling new progression holes is a last resort a... Apr 18 2025, 07:10 PM dtmehall if you want to investigate weber carb options cb p... Apr 18 2025, 05:08 PM dtmehall :agree: Apr 18 2025, 07:35 PM mmichalik Going to pull the emulsion tubes and idle jets to ... Apr 18 2025, 11:23 PM Superhawk996 Need the Venturi size too!!
Very often th... Apr 19 2025, 05:38 AM CCE
Hi everyone,
My 75 is ready to drive again. I fi... Apr 20 2025, 02:31 PM mmichalik @porschetub
[b]@[url=http://www.914world.com/bbs... Apr 20 2025, 07:30 PM Superhawk996
Venturi's are 32
Yeah that’s gonna’ suc... Apr 20 2025, 09:11 PM mmichalik Just an FYI, my goal is to have a solid driver tha... Apr 21 2025, 08:46 AM 930cabman
Just an FYI, my goal is to have a solid driver th... Apr 21 2025, 11:38 AM mmichalik
Just an FYI, my goal is to have a solid driver t... Apr 21 2025, 12:30 PM VaccaRabite
Just an FYI, my goal is to have a solid driver th... Apr 21 2025, 01:19 PM Superhawk996 Pick your Venturi 1st
Then general rule of thumb... Apr 21 2025, 09:52 AM mmichalik OK, I'm going in today. :) Changing the vent... Apr 27 2025, 10:35 AM mmichalik Just finished changing the venturi's, they wer... Apr 27 2025, 12:53 PM porschetub
Just finished changing the venturi's, they we... Apr 27 2025, 07:32 PM mmichalik Drove it. Venturi's made a huge difference, n... Apr 27 2025, 04:39 PM 930cabman
Drove it. Venturi's made a huge difference, ... Apr 27 2025, 05:33 PM Eric_Shea Put 28's in it.
We have a jetting spreadsheet... May 1 2025, 01:42 PM 930cabman Invest in Pat Bradens book, Weber Carburators May 1 2025, 06:05 PM mmichalik @Eric_Shea Agreed, they made a HUGE difference to... May 2 2025, 11:41 AM 930cabman
[b]@[url=http://www.914world.com/bbs2/index.php?s... May 2 2025, 04:10 PM |
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