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Re: Six Pack: Why do they have secondary idle mixture adj?
[Re: ragtop]
#1495261
09/02/13 06:55 PM
09/02/13 06:55 PM
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Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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Quote:
Theoretcally, what would happen if you turned all of the outboard carb screws, in all the way? Thanks.
They supply fuel to the forward and rear cylinders while at idle. If you shut them off a dangerous lean condition will likely occur, this can cause burned pistons, etc. That's why the factory adjusted them and staked them, to help keep owners from burning up their engines practicing their tuning skills. 
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Re: Six Pack: Why do they have secondary idle mixture adj?
[Re: ScottSmith_Harms]
#1495262
09/02/13 07:10 PM
09/02/13 07:10 PM
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Joined: Nov 2005
Posts: 836
lancaster, new york
macmic87
super stock
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super stock
Joined: Nov 2005
Posts: 836
lancaster, new york
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the way I heard it is so the fuel is being used that is in the float bowls so at least there is fresh fuel coming in. not that there would be a problem with just jamming your foot down to use the outboards.  also helps with the lean mixture that will happen when the outboards open because they don't have a pump shot.
Last edited by macmic87; 09/02/13 07:12 PM.
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Re: Six Pack: Why do they have secondary idle mixture adj?
[Re: lewtot184]
#1495264
09/02/13 10:59 PM
09/02/13 10:59 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Most 4 brll carbs and other extra carbs like 6pk's have idle circuits in the non primary brll's. Many 4 brll's have non adjustable idle circuits in the secondary's. Ron
Last edited by 383man; 09/02/13 11:00 PM.
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Re: Six Pack: Why do they have secondary idle mixture adj?
[Re: ragtop]
#1495265
09/08/13 01:13 AM
09/08/13 01:13 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'm running the old Direct Connection mechanical secondary, side hung float bowl carbs. The outboards on this set-up have no fuel/air circuits. It idles of the center carb only.
The factory outboards have fuel/air idle circuits on the end carbs to keep the fuel from stagnating if they are not opened for extended periods.
Due to the weight of my right foot, I don't seem to have that problem.
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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