Quadrajet Problem Solving > Quadrajet Parts and Numbers

Q-Jet vs. DualJet

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Schurkey:
I went to my favorite salvage yard looking for decent core carbs.  Came home with two; and expect to find others once the ground dries up and I can drive through the rows of vehicles instead of confining my search to a couple of sheds filled with carbs.

Most of the carbs stacked on shelves in the shed are missing the choke coils, my two cores included.

There are a batch of DualJet carbs, some of which have the electric choke coils still mounted.

1.  What is the typical resistance of an electric choke coil?  My ohmmeter shows anywhere from 4 ohms to multi-thousand ohms; I'm sure some of those choke coils that I measured were defective.

2.  Are DualJet choke coils interchangeable with Q-Jet coils?  I'm sure they are.  The electrical connector retaining tabs on the coils on some--but not all--of the DualJets looks to be really huge.  The mating connector must be a monster.

3.  Anyone need a DualJet carb?  This place has a dozen or more just sitting on shelves.  EVERY DualJet I looked at had the larger venturi arrangement similar to the "800 CFM" Q-Jets.  There's a DualJet 165 (looks like a '74-older Q-Jet including a full-size casting where the "secondary" side is blank--no throttle plates, and no opening air valve; a DualJet 200 which looks like a '75-Newer Q-Jet and has a similar full-size casting with the blank secondary side; and a batch of DualJet 210 which are similar to the '75-Newer Q-Jet primary side, but the 210 is a smaller casting that doesn't have the secondary area at all.

Schurkey:
Some comparison photos of the DualJet carbs.  Note that the photos are of carbs from a salvage yard, and taken on-site--thus the lovely grass and dirt backgrounds:


If you look really close, "DualJet 165" is cast into the area where the secondary air valve would be on a Q-Jet.


Choke blade is missing


The DualJet 165 is similar.

Cliff Ruggles:
The choke coils will fit, use an lead from a positive battery post to the connector, then ground the housing on the negative battery post.  If it doesn't heat up in 3 minutes, it's JUNK.....Cliff

Schurkey:

--- Quote from: Cliff Ruggles on June 13, 2009, 02:58:23 AM ---The choke coils will fit, use an lead from a positive battery post to the connector, then ground the housing on the negative battery post.  If it doesn't heat up in 3 minutes, it's JUNK.....Cliff

--- End quote ---
You don't recommend an ohmmeter to test them? 

Cliff Ruggles:
Nothing better than a real test, as I don't fully trust electronic testing devices for these sorts of things.  The range is simply too wide.  If the unit doesn't heat up quickly, or heat up at all, it's toast!....Cliff

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