 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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#1
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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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| mmichalik |
Apr 27 2025, 12:53 PM
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#2
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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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Just finished changing the venturi's, they were 34's not 32's..... I put 28's in. It started up and maintained idle, I have not driven it yet though. Waiting for a buddy to drop by and drive a chase car just in case.
Started easier than usual and Idle exhaust smells better too. Still fat but better..... |
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| porschetub |
Apr 27 2025, 07:32 PM
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#3
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Advanced Member Group: Members Posts: 4,819 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(mmichalik @ Apr 28 2025, 06:53 AM)  Just finished changing the venturi's, they were 34's not 32's..... I put 28's in. It started up and maintained idle, I have not driven it yet though. Waiting for a buddy to drop by and drive a chase car just in case. Started easier than usual and Idle exhaust smells better too. Still fat but better..... Wow those are big vents !!! ,with minor jetting changes results will be great ,must have run like a pig on those vents and idles ...really reduced vacuum signal and poor transition for that reason, reckon this combo will really come alive well tuned, every motor is different and not same for same there are too many variables to consider , you are getting close ,cheers. |
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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 Superhawk996 One thing that is critical to tuning IDF’s is to... Apr 18 2025, 11:07 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 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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