Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

6 cyl draw threw turbo

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hiy_po:
Where I am at


Idle tubes 0.067" top 0.031" bottom
Idle Down-Channel Restriction 0.047"
Idle Discharge tube 0.118"
Upper Idle Air-Bleed    0.040"  (Air horn)
Upper Idle Air-Bleed body    blocked
Lower Idle Air-Bleed    0.065"
Idle Air By Pass throtle plate outlet 0.079"
Main Air-Bleed Airhorn 0.079"
Main Air-Bleed body 0.040"
Primary Jet 0.073
Primary Rod 0.048
Custom: / (2-5) / 0.900' spring
ATP 2 turns up.
Secondary Metering Rods   0.044' tip inch “DA” code
Secondary hanger bracket B
Needle-Seat 0.130"
Float setting 0.250.

hiy_po:
Too ambitious ?? How small can you go?
Have the Idle tubes down to 0.023 jet. They look pretty small.

Cliff Ruggles:
If you are using a .065" LIAB and .040" upper in the airhorn it will not need a lot of idle tube to put plenty of fuel to the mixture screws and transfer slots.

Marine carburetors used a similar set-up as they were not emission calibrated.  They also use very small idle tubes and generous idle fuel at the mixture screws.

It's remarkable how responsive Marine carburetors are if you test one.

If you look all the way back to early production Q-jets, you'll also notice that early units thru 1967 will also use less idle air and smaller idle tubes.......Cliff

hiy_po:

--- Quote from: 77cruiser on October 21, 2019, 07:23:57 AM ---OK I'll get em out today 6/6-32 & 4/8-32.

--- End quote ---

Thank you. They look alot better than my home made ones.

hiy_po:
My latest carb setup

FIRST Carb (Stage Two Ver 6-1)
________________________

Idle tubes 0.063" top 0.024" bottom
Idle Down-Channel Restriction 0.041"
Lower Idle Air-Bleed    0.054" #54
Idle Discharge tube 0.118"
Upper Idle Air-Bleed    0.040"  (Air horn)
Upper Idle Air-Bleed body    blocked
Idle Air By Pass throttle plate outlet 0.079"
Main Air-Bleed Airhorn 0.064" #52
Main Air-Bleed body 0.040"
Primary Jet 0.072
Primary Rod 0.048
Custom: / (2-5) / 0.900' spring
ATP 2 turns up.
Secondary Metering Rods   0.044' tip inch

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