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Old 05-24-2011, 05:42 PM   #1
stock chassis boyz
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Default King demon carb help!!

Have a king demon drag race carb on my bbc . Problem is it's fat . Took some jet out of it and it slowed down a little mph. Plugs look ok after pass but still fat idle circuit on plug is black . anyone work on these carbs was thinking to start heading in the low speed air bleed direction. Does anyone have a guy who specializes in these carbs who can set it up?
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Old 05-24-2011, 05:48 PM   #2
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Default Re: King demon carb help!!

Need more info on your setup, cubic inch, compression, cam, which King (size), anything that's been done to the carb, etc.
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Old 05-24-2011, 06:20 PM   #3
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Default Re: King demon carb help!!

Dale Cubic at CFM Performance has done my RS King Demon in the past and it worked excellent.
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Old 05-24-2011, 06:21 PM   #4
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Default Re: King demon carb help!!

Add to that plug heat range, ignition type, timing... any info you can.

Considering it slowed with a smaller jet means you went the wrong way even though it appears rich. The idle, transition, and probably a large part having an intermediate circuit makes it fat down low. Also, which model King Demon is it?
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Old 05-24-2011, 06:35 PM   #5
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Default Re: King demon carb help!!

motor is 540 14 to 1 1090 demon blue sleeves cam is 4/7 swap 850 lift square jets 95. msd ign timing locked out at 36*.
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Old 05-24-2011, 06:45 PM   #6
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Default Re: King demon carb help!!

Take the intermediate bleeds out, the middle ones and should be .070, and leave them out. Go up to around .055 on the idle air bleeds, readjust the mixture, put the 95 jets back in if that is what you had before it slowed. Fresh plugs and run it again, I'd run no colder than an R5671A-8, my choice would be a 7.
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Old 05-24-2011, 06:47 PM   #7
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Default Re: King demon carb help!!

you guys and your taking the intermediate air bleeds out just KILL me............
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Old 05-24-2011, 07:02 PM   #8
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Default Re: King demon carb help!!

Runnin ngk 7's now . The intermediate air bleeds take out? and leave out ? why?
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Old 05-24-2011, 07:19 PM   #9
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Default Re: King demon carb help!!

Quote:
Originally Posted by RCM Racing engines View Post
you guys and your taking the intermediate air bleeds out just KILL me............
Leaving them in kills the plugs. The old style 9375 Dominator had no press in inserts in the intermediate circuit, left wide open. It was one of the best out of the box Dominator calibrations Holley made. Still a bit rich on the intermediate circuit, my 2 circuit converted 1050 runs a little quicker.

As far as why to use or not a 3rd circuit, it's been discussed all over several boards. To each his own, either can be made to work when tuned right, in most cases the intermediate circuit is just not needed.

Here are a couple places to read. The first one describes the origins of the intermediate circuit as much as possible considering the engineers involved are most likely passed on, pay attention to BarryR's comments as he was employed by Holley in the 80's as well as Tuners info.

http://speedtalk.com/forum/viewtopic.php?f=1&t=7111

More reading.

http://www.motorsportsvillage.com/fo...php?f=6&t=3742
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Old 05-25-2011, 11:32 AM   #10
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Default Re: King demon carb help!!

Ummm if it's fat at IDLE... Why not just lean out the IDLE circuit???

How does the car run down track?
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Old 05-25-2011, 02:21 PM   #11
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Default Re: King demon carb help!!

If the intermediate circuit is supplying too much fuel you can change the pickup restrictors as well, and leave the air bleeds in. They are 6/32 threads. Treat them like the mains and jet them down if that circuit is too rich.
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Old 05-25-2011, 03:52 PM   #12
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Default Re: King demon carb help!!

SoChange the idle circuit air bleeds and start there?
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Old 05-25-2011, 04:01 PM   #13
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Default Re: King demon carb help!!

Idle mixture screws
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Old 05-25-2011, 04:17 PM   #14
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Default Re: King demon carb help!!

Quote:
Originally Posted by stock chassis boyz View Post
SoChange the idle circuit air bleeds and start there?

1) Is the only problem you're having is that it's rich at idle?
2) What tuning have you done to this point?
3) Where do you have the float levels set at?
4) How much fuel pressure are you running to the carburetor?
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Old 05-25-2011, 09:20 PM   #15
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Default Re: King demon carb help!!

if it sits overnight w/ fuel in it will it drain down in one of the bowls?
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