Register now to get rid of these ads!

Which Quadrajet Should I use?

Discussion in 'The Hokey Ass Message Board' started by Dayzedandkonfuzed, Feb 15, 2013.

  1. Dayzedandkonfuzed
    Joined: Oct 20, 2011
    Posts: 87

    Dayzedandkonfuzed
    Member

    I have 3 quadrajets, dont know which one to build; 17087124, 17085001, 17058213. The 17087124 is super clean, looks like it was rebuilt not long before it came off of its vehicle, but I think it needs throttle shaft bushings. Running a near 400hp 350, which one is best?
     
  2. That sounds like a carb king question. :D
     
  3. mustang6147
    Joined: Feb 26, 2010
    Posts: 1,847

    mustang6147
    Member
    from Kent, Ohio

    Go with the easiets one to rebuild as long as it has the mixture screws to adjust. Otherwise its a smog carb and for get it all together...
     
  4. burnout2614
    Joined: Sep 21, 2009
    Posts: 612

    burnout2614
    Member

    I agree w Porknbeaner. peace
     

  5. If you have a good one they are great,but I have never had any luck rebuilding them. HRP
     
  6. DrJ
    Joined: Mar 3, 2001
    Posts: 9,418

    DrJ
    Member

  7. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

  8. mart3406
    Joined: May 31, 2009
    Posts: 3,055

    mart3406
    Member
    from Canada

    Yeah. It must be from a 'one off,'
    rarer-than-rare, 'ultra-top-secret'
    factory experimental prototype
    that was never released to the
    public. You see them advertised
    on epay all the time. :D

    Mart3406
    =====================
     
  9. 38standard
    Joined: Jan 4, 2010
    Posts: 322

    38standard
    Member
    from il.

    Must be Canadian.
     
  10. RHOPPER
    Joined: Mar 12, 2006
    Posts: 263

    RHOPPER
    Member

    Cliff Ruggles has a good qjet book out. He also sells parts and offers throttle shaft rebushing. He's got a web site at cliffshighperformance. I've had to call him directly a time or two. He gives advice over the phone and is decent to deal with. In his book he has a number of standard builds according to what carb you're starting with and what it's going on. Basically, you can start with just about any qjet, it's all in what you do with it. You may plug this passage and redrill it smaller, then enlarge this one. It's in the book. Read it several times, take it to the bathroom with you and really learn what all the parts do.
     
  11. HEATHEN
    Joined: Nov 22, 2005
    Posts: 7,591

    HEATHEN
    Member
    from SIDNEY, NY

    I'd forget about all of them and look for one in the '69-74 vintage to rebuild.
     
  12. kwoodyh
    Joined: Apr 11, 2006
    Posts: 641

    kwoodyh
    Member

    I have a "love hate" relationship with the q-jet, I'd build the one with the least slop around the throttle shaft.
     
  13. pdq67
    Joined: Feb 12, 2007
    Posts: 787

    pdq67
    Member

    FWIW, the way early, say, like my '67 350 SS/RS Camaro cars Q-Jet had a rubber "condum" that fit over the float needle to hold it in place that flowed more than the later Q-Jets did.

    And the REAL trick setting up a Q-Jet is to tune the back top air butterfly's to kick in when you want them to.

    You set them by loosening the little bitty hex set screw that is on the, (I want to say, bottom), of the pass side of the top shaft. BUT you have to hold the shaft using a little bitty straight screw driver that is inserted into the slot on the end of the butterfly's shaft because of the balance spring!!

    Turn the screw driver NO MORE than an 1/8 of a turn in or out for starters. Then cinch the hex set screw down and take her out and run her to see how that back air valves kick in. You don't like it, then come back and repeat until you like the way that the butterfly's kick in.

    I set mine so that i could sneak up on 65 to 70 mph on the front barrels, but when I floored it, the back barrels would kick in at 30 to 35 mph and I was off!!

    I, to this day, remember the loud suck when my secondaries kicked in at rpm.

    Oh, and btw, the back barrels top butterfly's only kick in under load so this is a drive test deal for a Sat. afternoon.

    pdq67
     
  14. black 62
    Joined: Jul 12, 2012
    Posts: 1,895

    black 62
    Member
    from arkansas

  15. sscargo
    Joined: Oct 13, 2009
    Posts: 20

    sscargo
    Member
    from La Grange

    Yes! X2
     
  16. hoop98
    Joined: Jan 23, 2013
    Posts: 1,363

    hoop98
    Member
    from Texas

    The 17087124 is off a 85-87 Truck, it has a connector for a dual capacity accelerator pump, which uses the Coolant temp to change pump capacity, more cold. The 5001 is a more conventional carb but does have APT or adjustable part throttle. It is an 85-87 Truck calibration.

    The first 2 have Electric Chokes.

    The 17058213 is a 78 Truck/Marine calibration with a divorced choke. That means you have to have the thermostatic coil in the manifold.

    If you are mechanically inclined you could likely adapt the electric choke parts over.

    Hoop
     
  17. bobkatrods
    Joined: Sep 22, 2008
    Posts: 664

    bobkatrods
    Member
    from aledo tx

    rhopper has given you the best advice on here,,, Q jets are a great carb when they are rebuilt RIGHT,, there is no magic to them, Read the Ruggles book and buy the right kit for your application,, I have never met anybody who knows more about them than Cliff Ruggles. You can go to his forum and get a lot of info.
     
  18. hoop98
    Joined: Jan 23, 2013
    Posts: 1,363

    hoop98
    Member
    from Texas

    I'll second getting the book but I think the 2 newer carbs will be harder to setup.

    I've got a copy around here and wouldn't start without it even though I did a thousand or so back in the day. Way too many combinations to remember.

    rhooper with 1 P
     
  19. bobkatrods
    Joined: Sep 22, 2008
    Posts: 664

    bobkatrods
    Member
    from aledo tx

    Yes , with one P,, I would not make a good secretary,,,,, i can tell you have been around them with the APT statement
     
  20. saltflats
    Joined: Aug 14, 2007
    Posts: 10,318

    saltflats
    Member
    from Missouri

    Look for one with the big primary venturies and the air valve on the sec that opens all the way some of the early cads had the big ones on them and the fuel inlet in the same place as the chevys.
     
  21. hoop98
    Joined: Jan 23, 2013
    Posts: 1,363

    hoop98
    Member
    from Texas

    I like the APT carbs but they are not as friendly to new carb guys.

    The 78 Carb calibration should be close if it is in good shape. If you want good mileage the power piston or primary metering rod spring is where to play.
    IMHO
    [​IMG]

    Google quadrajet power piston springs for more info

    Because the 78 was calibrated for part throttle EGR it is calibrated for low vacuum, with 2 springs, and may be off with no EGR.

    BTW, vacuum advance units and vacuum modulators will be off with no EGR, you should use 72 and earlier ones with no EGR,

    For best mileage you want the weakest spring that is ok for driveability.

    Hoop
     
  22. Dayzedandkonfuzed
    Joined: Oct 20, 2011
    Posts: 87

    Dayzedandkonfuzed
    Member

    I have cliff's book, and have read a few chapters. He basically states that almost any quad is a good start, as they all only vary slightly after 76.

    So the 7124 doesnt have APT? I'm leaning towards using it because I wouldnt mind playing with the dual capacity accelerator pump. Also it already has the mixture screw caps removed from the baseplate, and like i said before, looks super clean inside and out.

    I imagine I can mix and match most parts between the 3 too, metering rods, power valves, maybe a choke pulloff?
     
  23. bobkatrods
    Joined: Sep 22, 2008
    Posts: 664

    bobkatrods
    Member
    from aledo tx

    I think you are set, if you have the book no use asking on here call Cliff he doesn't mind answering questions and he will also answer on his forum.
     
  24. Dayzedandkonfuzed
    Joined: Oct 20, 2011
    Posts: 87

    Dayzedandkonfuzed
    Member

    Cool, at least I know I'm heading in the right direction
     
  25. bobkatrods
    Joined: Sep 22, 2008
    Posts: 664

    bobkatrods
    Member
    from aledo tx

    Besides what the nay sayers think , If you do that carb RIGHT you will be happy in all respects,, I did one for my son on a 355 ci sbc with around 400 hp like yours, i did put some time in on tuning it, but the results were a sweet running motor that started ALMOST as fast as a tbi/tpi. He drove back and forth to college on weekends and it got 17-18 mpg cruising and about 14-15 around town, and this was in a heavy pick up truck that would light the tires up from a 10-15 roll.Also would pass the state emission sniff check, Doing one for my 57 truck at the moment.
     
  26. cbillelder
    Joined: Dec 17, 2010
    Posts: 704

    cbillelder
    Member

    Another option, if you aren't picky about authenticity, is to use a Holley 4175 Q-jet replacement carb instead. I have one here for sale that had less than 500 miles on it on a Buick 350 motor before I pulled it and did an engine swap for a Ford 5.0 EFI motor. The carb is in virtually new condition. Summit currently lists them for $429.95 in their catalog./ I'll sell mine here for $275 out the door. Email me at cbillelder@comcast.net if you are interested.
     

    Attached Files:

    • 017.jpg
      017.jpg
      File size:
      497.2 KB
      Views:
      137
  27. Dayzedandkonfuzed
    Joined: Oct 20, 2011
    Posts: 87

    Dayzedandkonfuzed
    Member

    thanks but no thanks. The initial reason i decided to try my hand at building a quad is because funds are tight right now haha
     
  28. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Nope, not Canadian. Maybe Ukrainian export Z-28??:eek:
     
  29. bobkatrods
    Joined: Sep 22, 2008
    Posts: 664

    bobkatrods
    Member
    from aledo tx

    Or maybe B S:confused:
     
  30. DrJ
    Joined: Mar 3, 2001
    Posts: 9,418

    DrJ
    Member

    Friggin jokers...

    I guess I should have said taken out of rather than from...
    It didn't have the "correct" engine in it either, since it said it was a 350.
    Anyway, the numbers on it are 07029207 and it came out of a Camaro with Z28 decals/trim on it.
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.