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Re: Carb experts, Wideband A/F ratios in on mechanical 6 pack.
[Re: ademon]
#1879378
07/27/15 06:40 PM
07/27/15 06:40 PM
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Joined: Mar 2007
Posts: 3,277
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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Interesting. I also am using the Promax metering block on my center carb. I had them rebuild and set-up the carbs initially.
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: Carb experts, Wideband A/F ratios in on mechanical 6 pack.
[Re: jbc426]
#2770109
05/01/20 11:36 AM
05/01/20 11:36 AM
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Joined: Mar 2007
Posts: 3,277
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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I did block the IAB on the outer carbs and the idle drops, so I'm pretty sure they add to the idle and also help to keep the fuel fresh if you never crack open the outer carbs. Do your outboards have air/fuel adjustment screws on them? Mine don't. That's why I assumed they don't have idle circuits. Old thread, but I found I put out bad info and I stand corrected. I've been advised that the outboard carbs do add fuel at idle. In fact, I had to ever so slightly crack the throttle blades open on them to lean out my idle. I also moved the IFR jet down below the fuel level, which dramatically stabilized my idle A/F ratio. I also had to lean them up a touch.
Last edited by jbc426; 05/01/20 11:37 AM.
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: Carb experts, Wideband A/F ratios in on mechanical 6 pack.
[Re: ademon]
#2770183
05/01/20 03:31 PM
05/01/20 03:31 PM
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Joined: Aug 2003
Posts: 43,096
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,096
Bend,OR USA
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It looks like the squirter screws are not adjusted properly like Holley calls for, they recommend lengthening them until you have .015 more movement, travel to bottoming them out, at WOT on all the accelerator pump screws  If it isn't that way now try fixing and go drive it  If that helps then try making the center squirter bigger by the next size or two sizes bigger if needed 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Carb experts, Wideband A/F ratios in on mechanical 6 pack.
[Re: Cab_Burge]
#2770226
05/01/20 05:57 PM
05/01/20 05:57 PM
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Joined: May 2009
Posts: 511
Temperance, MI
68 HEMI GTS
mopar
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mopar
Joined: May 2009
Posts: 511
Temperance, MI
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I added adjustable idle circuits to my mechanical carbs and plugged the weep holes.
68 Dart GTS "HEMI" 10.30 @ 131 pump gas street car 3780#
69 Roadrunner 511 six pack 10.92 drive to track street car
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Re: Carb experts, Wideband A/F ratios in on mechanical 6 pack.
[Re: 68 HEMI GTS]
#2770439
05/02/20 01:09 PM
05/02/20 01:09 PM
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Joined: Mar 2007
Posts: 3,277
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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I added adjustable idle circuits to my mechanical carbs and plugged the weep holes.
Are you the one who posted the steps required to do this? If so, can you attach the link, please?
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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