Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: Jeremiah]
#2263171
03/04/17 12:15 PM
03/04/17 12:15 PM
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polyspheric
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Are you sure it's lean, or is the secondary air valve opening too early?
The later JY snorkel type A/C probably fits, allows cold air @ WOT and hot air for cruise, run a duct from the snorkel to the radiator support.
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Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: dvw]
#2263309
03/04/17 04:27 PM
03/04/17 04:27 PM
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Jeremiah
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The next heavier step up spring (possibly even heavier after testing). Move the accelerator pump rod to the rear hole. Where is the float level? Is it at the factory setting? If so I'd raise the float level about 1/8, you may be able to get away with even more depending on fuel pressure. E10 will probably require one size up in jet all the way around. Doug Floats are set at 5/16+ on both sides, 3/4" float drop per FSM. Accelerator pump rod is on the middle setting. I'll try to move it back to the rear hole. I did open up the secondary jets to .086 measured with a pin guage. I was hesitant to open up the primaries before I see what parts Cab has stashed away. Thanks for the advise. Also of note, my issue was not needle and seat but rather a sunk float.
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Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: polyspheric]
#2263314
03/04/17 04:34 PM
03/04/17 04:34 PM
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Jeremiah
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Are you sure it's lean, or is the secondary air valve opening too early?
The later JY snorkel type A/C probably fits, allows cold air @ WOT and hot air for cruise, run a duct from the snorkel to the radiator support. I had considered the secondary air valve being an issue. I figured I start with jet and go from there. In my travels I did find a 4130S AFB so I do have some extra parts to try as time allows. As absurd as it it sounds the *only* reason I am still running this old AFB is to keep that goofy little air cleaner. I have a few we could try either way thought. Thanks for the suggestions.
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Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: Jeremiah]
#2263322
03/04/17 04:50 PM
03/04/17 04:50 PM
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Posts: 3,298 West Coast, USA
jbc426
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Are you using a wideband? If not, good luck with the plug reading.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: Jeremiah]
#2263346
03/04/17 05:42 PM
03/04/17 05:42 PM
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JAKE68
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If you are experiencing a tip in stubble you may need to go to a smaller size squirter. This seams to be opposite from what one may think but what it does is changes the deration of the squirt. The position of the rod on the accelerator pump arm controls the amount. What is happening with the large squirter is you get a big gulp of fuel then a dead spot. With the smaller one the stream of fuel last threw out the entire stroke.
JAKES AUTOMOTIVE
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Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: dvw]
#2263421
03/04/17 09:15 PM
03/04/17 09:15 PM
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Jeremiah
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I had considered the secondary air valve being an issue. I figured I start with jet and go from there. In my travels I did find a 4130S AFB so I do have some extra parts to try as time allows.
As absurd as it it sounds the *only* reason I am still running this old AFB is to keep that goofy little air cleaner. I have a few we could try either way thought. Thanks for the suggestions.{quote}
I believe a 4133 S AFB has a weighted air door, not a spring controlled air door. Doug
You are correct, it is a weighted air door. We are headed out for a test drive, I'll check back in with some data. At this point I have not put the wideband on it however the bungs are installed. Over the years I have worked my way into a pretty good tuning strategy with carbs that seems to work okay. It's fun to see how close we can get and then verify our results with the LM-2. I honestly figure someone had a recipe for this common 575cfm AFB that came on many 383's and 440's. The carb is back on and seems to run good again and is very responsive. Jake might be correct on the too big of an accelerator pump shot. I moved the arm to the inside hole and it made a rich stumble when I tested idle to WOT in the driveway. I'll put some heat in it and see what it does. Thanks again for all of the advice!
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Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: Jeremiah]
#2263662
03/05/17 01:58 PM
03/05/17 01:58 PM
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JAKE68
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How I stumbled on this was Dave Dudek had some modified carbs for one of his hemi's in fast and on my Dyno he had a bad stumble. He sent the carbs back to the builder and he put larger squirters in it only to make the problem worse. So I got out the old carter tuning book and read it and that is what they said to do. So I pulled the squirters out and apoxied the hole shut and then re drilled them to over half the original size and bingo it worked. I now am a believer. Hope all works out for you. Jake
JAKES AUTOMOTIVE
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Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: Jeremiah]
#2263682
03/05/17 02:25 PM
03/05/17 02:25 PM
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Verify the fuel level in the bowls. I have had issues where the fuel level was too low (after setting the floats to spec.) This resulted in a bad tip-in stumble. I did the larger squirter shot, richer jets, and such which only helped a small amount. Once I re-adjusted the floats so I have fuel in the carb bowl at least as high as the notch in the plates separating the pri/sec jets, then it ran great, but I had to undo the changes I made (larger pump shot, and larger jets.) With the E-10, I would change to a size larger jet front and rear. The Edelbrock parts will work in a AFB with two step rods.
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Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: Jeremiah]
#2263714
03/05/17 03:11 PM
03/05/17 03:11 PM
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Cab_Burge
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I believe a 4133 S AFB has a weighted air door, not a spring controlled air door. Doug
You are correct, it is a weighted air door. We are headed out for a test drive, I'll check back in with some data. I honestly figure someone had a recipe for this common 575cfm AFB that came on many 383's and 440's. All the AFB I've seen except some of the early 273 AFB, they didn't have any thing above the venturi , have weighted doors. Only the AVS and Thermoquad carbs. have the spring loaded doors As far as having a decent tune up for todays fuel and the different altitudes and weather conditions, your probably going to need EFI to get that done
Last edited by Cab_Burge; 03/05/17 03:12 PM.
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Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: Cab_Burge]
#2263734
03/05/17 03:30 PM
03/05/17 03:30 PM
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Joined: Mar 2003
Posts: 9,112 Rogue River, OR
Jeremiah
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I believe a 4133 S AFB has a weighted air door, not a spring controlled air door. Doug
You are correct, it is a weighted air door. We are headed out for a test drive, I'll check back in with some data. I honestly figure someone had a recipe for this common 575cfm AFB that came on many 383's and 440's. All the AFB I've seen except some of the early 273 AFB, they didn't have any thing above the venturi , have weighted doors. Only the AVS and Thermoquad carbs. have the spring loaded doors As far as having a decent tune up for todays fuel and the different altitudes and weather conditions, your probably going to need EFI to get that done You are correct on the air door. We have a few of those kicking around too. To catch you all up to date we sid take a 20 mile ride and it appears the tip-in hesitation is gone. The roads were wet so I'll have to wait a few weeks to test the accelerator pump and idle-WOT behavior. Once we get some positive results we can all have a laugh when I hook up the wide band.
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Re: "Super Tuning" the OEM Chrysler 4133S 575cfm Carter AFB?
[Re: JAKE68]
#2263738
03/05/17 03:34 PM
03/05/17 03:34 PM
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Joined: Mar 2003
Posts: 9,112 Rogue River, OR
Jeremiah
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How I stumbled on this was Dave Dudek had some modified carbs for one of his hemi's in fast and on my Dyno he had a bad stumble. He sent the carbs back to the builder and he put larger squirters in it only to make the problem worse. So I got out the old carter tuning book and read it and that is what they said to do. So I pulled the squirters out and apoxied the hole shut and then re drilled them to over half the original size and bingo it worked. I now am a believer. Hope all works out for you. Jake Thank you for the heads up, I'll break out my old Carter manual and read a little while this snow storm blows in. I know what good running 383-4 feels/sounds like and this one isn't running like that...yet. IMO most enthusiasts have never road in a good running stock (or close) 383 or 440. Between the nylon cam gear, camshaft grinding errors (or not degreeing the cam), carburetor issues and ignition issues I've seen more dogs than not in these stock style rebuilds.
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