Re: question for anyone running dual quads
[Re: RodStRace]
#86925
07/11/08 01:15 PM
07/11/08 01:15 PM
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Anonymous
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Anonymous
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Quote:
both. They should both be open the same amount (syncronized). Even 6 packs need to have the end carbs' throttle opening and mix set.
Not necessarily.
It depends on how you set up your linkage. What you are talking about is not the way the factory did it. For both hemi and six pack they were set up progressively. Meaning that on the hemi the front two barrels of the rear carb first then the rear two barrels of the rear carb, then the front two barrels of the front carb and finally the rear two barrels of the front carb.
Aftermarket some set them up to pull the front and rear carb in at the same time, but that was typically race only.
A factory six pack was set up to run off of the center two barrels first.
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Re: question for anyone running dual quads
[Re: dodgedart416]
#86926
07/11/08 03:29 PM
07/11/08 03:29 PM
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Rio Linda, CA
John_Kunkel
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Early factory Street Hemis had mixture screws in the front carb so you could adjust both carbs, the '70 and '71 had the recessed mixture screws preset and the screw holes were plugged. (emissions)
Even with the factory progressive linkage the early idle mixture adjustment procedure calls for adjusting the screws in both carbs.
The INTERNET, the MISinformation superhighway
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Re: question for anyone running dual quads
[Re: John_Kunkel]
#86931
07/12/08 10:53 PM
07/12/08 10:53 PM
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hemijimbo
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Quote:
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the street hemis idle off of the primaries of the rear carb, the front carb did not even have usable idle circuits.
Not so, all Street Hemi front carbs had idle mixture screws and the accompanying circut
69 rr does not have the mixture screws in the front carb,.... it does however have an idle "speed" screw, for both f&r carbs
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Re: question for anyone running dual quads
[Re: dodgedart416]
#86932
07/12/08 11:12 PM
07/12/08 11:12 PM
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Joined: Dec 2005
Posts: 799
Missouri
bb74swngr
mopar addict
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mopar addict
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Missouri
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My personal preference is just using the idle system on the rear. I have the CH28 with two 600s. Tried it both ways and seems to adjust and transition better with just the rear. With both idles systems being used, as the primary main system in the rear carb phases over it's idle system it may not be able to sense the front idle system as well. This is just a theory with my use and not documented as far as I know.
Russ:)
BigBlock 74 Swinger
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Re: question for anyone running dual quads
[Re: 65Coronet7165]
#86933
07/13/08 02:55 PM
07/13/08 02:55 PM
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Rio Linda, CA
John_Kunkel
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Quote:
Do you mind outlining that procedure John?? It would be of interest to me. I have the FSM for the 67 Chrysler/Imperial and of course they didn't have dual quads from the factory on those.
From the '68 FSM:
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Re: question for anyone running dual quads
[Re: John_Kunkel]
#86934
07/14/08 06:29 PM
07/14/08 06:29 PM
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California
mickm
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Quote:
Not so, all Street Hemi front carbs had idle mixture screws and the accompanying circuits.
hmmm.... that is a new one to me. decades decay the memory, but i specifically remember my 68 NOT having idle circuit screws on the front carbs, and i though all hemis did not.
i will have to take a look. can anyone post pictures of some front carbs?
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Re: question for anyone running dual quads
[Re: mickm]
#86935
07/14/08 10:35 PM
07/14/08 10:35 PM
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hemijimbo
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Quote:
Quote:
Not so, all Street Hemi front carbs had idle mixture screws and the accompanying circuits.
hmmm.... that is a new one to me. decades decay the memory, but i specifically remember my 68 NOT having idle circuit screws on the front carbs, and i though all hemis did not.
i will have to take a look. can anyone post pictures of some front carbs?
heres my 69 h/rr 40k 1 owner untouched front carb pic note no mixing screws... 
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Re: question for anyone running dual quads
[Re: mickm]
#86937
07/15/08 05:18 PM
07/15/08 05:18 PM
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Joined: Jan 2003
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Rio Linda, CA
John_Kunkel
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Rio Linda, CA
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The page I posted above is directly from the '68 FSM and instructs to adjust the idle mixture screws on the front carb. Kinda hard to do if they're not there.
Even though there are no visible mixture screws on later years they are still there under the plugs where the screws would normally be, they are preset a specific number of turns and plugged to prevent tampering with the adjustment that would affect the emissions.
The INTERNET, the MISinformation superhighway
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