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Quadrajet Carb Talk and Tips / Re: Secondary vacuum draw vs air door opening - test
« Last post by 70GS455 on February 17, 2026, 06:16:13 PM »
Quote from: lightning boy on February 16, 2026, 02:00:49 PM
I think the spring rate of the air door is why the graph looks like it does.
I held the door open manually at each stop setting to let the numbers stabilize and record the results during the trst
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Quadrajet Carb Talk and Tips / Idle speed solenoid
« Last post by Turbo26T on February 17, 2026, 12:54:57 PM »
My project car will have A/C.. Im looking for an idle-speed solenoid for my Quadrajet with enough force to open the throttle at idle when the compressor comes on .Factory Q/Jet idle stop solenoids only extend after the throttle is opened and do not have enough force . This would lead to stalling unless you blip the throttle.
Any thoughts , real world examples ,SWAG's etc..
 Thanks ,
 Stan
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Quadrajet Parts and Numbers / Re: Metering Rod and Jet Combos
« Last post by SUPRCHY on February 17, 2026, 11:28:53 AM »
One more kit to add to the list:

Jet & Rod Kit#   17067919: M4M

 .070"    Primary Jets
 51M      Primary Metering Rods
 DR        Secondary Metering Rods
 "K"       Secondary Hanger

Suprchy
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Quadrajet Carb Talk and Tips / Re: Secondary vacuum draw vs air door opening - test
« Last post by lightning boy on February 16, 2026, 02:00:49 PM »
I think the spring rate of the air door is why the graph looks like it does.
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For Sale / Wanted / Re: Wanted CC rods or equivalent
« Last post by Pav8427 on February 16, 2026, 12:30:38 PM »
True and square is not such a big deal. They 'flop' around a bit.
Diameter is the key. Just breath on them with a jewelers file and mic them as you go.
Sneak up on it.
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For Sale / Wanted / Re: Wanted CC rods or equivalent
« Last post by 70GS455 on February 16, 2026, 08:13:23 AM »
Im not sure in my ability to keep it true and square etc
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For Sale / Wanted / Re: Wanted CC rods or equivalent
« Last post by Pav8427 on February 16, 2026, 03:38:29 AM »
Drill clamped in a vise as well works.
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For Sale / Wanted / Re: Wanted CC rods or equivalent
« Last post by 77cruiser on February 15, 2026, 03:33:52 PM »
A drill press & file will work.
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For Sale / Wanted / Wanted CC rods or equivalent
« Last post by 70GS455 on February 15, 2026, 07:28:55 AM »
I need more fuel so I'm looking for some CC rods (0.030") tip or equivalent. I don't have a lathe or I would make some out of junk ones.
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Quadrajet Carb Talk and Tips / Re: Secondary vacuum draw vs air door opening - test
« Last post by 70GS455 on February 14, 2026, 05:48:19 PM »
Quote from: novadude on January 23, 2026, 09:56:28 AM
Interesting, but I'm not sure I understand what is happening from 1.35 to 1.45?  Also, would more CFM change the result from 1.2 to 1.35"?  Intuitively, you would think that smaller door opening would pull harder on the well, but maybe this doesn't show up until you have more CFM air flow?

I think you are on to it. I believe that if I were able to vary the CFM, it would reduce the results near 1.2 or 1.3. And yes it makes most sense that a more closed door would draw more ( like a choke blade). At the very least it will reduce the amount of air allowed in causing it to be richer. The airflow is reduced so maybe the venturi effect is lessened.
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