Help Choosing New Carb

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    Author Topic: Help Choosing New Carb  (Read 12920 times)

    Offline JRoss22

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    Re: Help Choosing New Carb
    « Reply #15 on: April 30, 2006 - 07:25:57 PM »
    I should have been more clear about it whent he carb was first rebuilt I had no problems with the car running. But eventually w/e the people did to rebuild the carb just went to crap. Im no specialist in this area at all but im hoping the new carb will solve everything and if it doesnt then I will have a new carb.
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    Offline JRoss22

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    Re: Help Choosing New Carb
    « Reply #16 on: May 02, 2006 - 02:40:57 PM »
    Quote from: 71383bee on April 30, 2006 - 10:38:48 AM

     :banghead:  Well so much for using your noodle to try and pinpoint what is actually wrong with the motor and pouring money down the toilet. 


    Carb is Installed now, fired it up and  :wow: :woohoo: it runs perfectly now so it solved the problem that we did infact pinpoint. Now I just need to wait for summit to ship me the throttle adapter will get that installed if not tomorrow then thursday and I will have the car back out on the road fir the first time in years.
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    Offline MEK-Dangerfield

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    Re: Help Choosing New Carb
    « Reply #17 on: May 02, 2006 - 05:09:32 PM »
    Summit is fast with shipping, so you will be happy soon.  :woo:  :woohoo:
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    Mike

    1970 Challenger - SOLD
    2016 SXT+.  1 of 524 SXT+'s in Plumb-crazy for 2016.

    Offline JRoss22

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    Re: Help Choosing New Carb
    « Reply #18 on: May 02, 2006 - 05:18:54 PM »
    I couldnt agree with you more on Summit thats why they are always the first place I will look to order from. :chatting: :burnout:
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    Offline scf100

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    Re: Help Choosing New Carb
    « Reply #19 on: May 02, 2006 - 09:08:15 PM »
    Quote from: Street_Challenged73 on April 30, 2006 - 03:19:42 PM
    Ah, just a 600 on a 340?!!!!  The original TQ's on '73 340s were rated at 750-800cfm...You probably should have gotten at least a 650 for it. :misbehaving:

    I called the Tech line at Edelbrock before I bought mine to get right size Edelbrock AVS for the stock 400 in my 70 Challenger and he recomended a 650 cfm.....I have a 428 ( sorry another brand!)  car and from the factory and still today runs a 735 Holley....
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    1970 Challenger R/T convertible 383…. 4-speed…3.91 suregrip

    Triple Black

    Offline Bullitt-

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    Re: Help Choosing New Carb
    « Reply #20 on: May 03, 2006 - 06:09:09 AM »
    650CFM Eddies seems to be fine for 340's (see below)
     The Great Carter Thermoquad Numbers Decode List

     

    Here are the Carter TQ number that I was able to lift from Govier's

    interchange book. The numbers go from 1971 to 1974.

     

    The letters listed under Models refer to carline (First letter of VIN)

     

    Number  Year   Engine   Trans      Remarks                 Models

    =======================================================================

    4972S   1971   340      Manl                               VLBJRW

    4973S   1971   340      Auto                               VLBJRW

    6090S   1972   400      Auto                                   RWPD

    6138S   1972   340      Manl                               VLBJRW

    6139S   1972   340      Auto                               VLBJRW

    6140S   1972   400      Manl       HP                          RW

    6165S   1972   400      Manl       HP w/air pump               RW

    6166S   1972   400      Auto       HP w/air pump               RW

    6212S          340                                         MARINE

    6318S   1973   340      Manl                               VLBJRW

    6319S   1973   340      Auto                               VLBJRW

    6320S   1973   400      Manl       HP                          RW

    6321S   1973   400      Auto       HP                          RWPD

    6322S   1973   440      Auto       LP                            PDCY

    6324S   1973   440      Manl       HP                          RWPDC

    6339S   1973   340      Manl       w/N98                   VLBJRW

    6340S   1973   340      Auto       w/N98                   VLBJRW

    6341S   1973   400      Manl       HP w/N98                    RW

    6342S   1973   400      Auto       HP w/N95-N98                RWPD

    6394S   1972   340      Auto       Export                   L

    6410S   1973   440      Auto       LP w/N98                      PDCY

    6411S   1973   440      Auto       HP w/N95-N98                RWPDC

    6452S   1974   360      Manl       HP                      VLBJRW

    6453S   1974   360      Auto       HP                      VLBJRW

    6454S   1974   360      Manl       HP Calif                VLBJRW

    6455S   1974   360      Auto       HP Calif                VLBJRW

    6456S   1974   400      Manl       HP                          RW

    6460S   1974   440      Auto       LP Early                      PDCY

    6461S   1974   440      Auto       LP Calif Early                PDCY

    6462S   1974   440      Auto       HP Early                    RWPDC

    6463S   1974   440      Auto       HP Calif Early              RWPDC

    6488S   1974   360      Auto                                   RWPDC

    6489S   1974   400      Auto       HP Early                    RWPDC

    6503S   1974   400      Auto       HP Export                    W

    9000S   1974   318      Both       Export                         D

    9013S   1974   360      Auto       Late                        RW

    9014S   1974   400      Auto       HP Late                     RWPDC

    9015S   1974   440      Auto       HP Late                     RWPDC

    9016S   1974   440      Auto       HP Calif Late               RWPDC

    9023S   1974   440      Auto       LP Late                       PDCY

    9024S   1974   440      Auto       LP Calif Late                 PDCY

    9801S   1974   383      Auto       Perf & Off road 800 CFM

     

     

      There always seems to be some confusion around here about TQ's and their

    cfm ratings, etc, and I found a response to someone's question in the

    'Performance Clinic' column by Dick Landy in the Aug/Sept 94 issue of Mopar

    Muscle (page 9).  It reads...

     

    [font=Verdana]"There are two basic ThermoQuad Carburetors:  one with 1 3/8" primaries and 2

    1/4" secondaries for the 318 and 340 (A) engines and a Holley comparison CFM

    of 650 CFM.    [/font]  The second one had 1 1/2" primaries and 2 1/4" secondaries with

    a Holley comparison CFM of 820.  It's used with some 360s and all the 'B'

    engines. Actually, Carter called this one a 1000 CFM unit.  Their airflow

    numbers were measured differently than Holley.       Also, some ThermoQuads had

    the secondary air-door limited, which also decreased the CFM."
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    Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
    Screwed by Photobucket!

    Offline 71383bee

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    Re: Help Choosing New Carb
    « Reply #21 on: May 03, 2006 - 08:28:07 AM »
    Quote from: JRoss22 on May 02, 2006 - 02:40:57 PM
    Carb is Installed now, fired it up and  :wow: :woohoo: it runs perfectly now so it solved the problem that we did infact pinpoint. Now I just need to wait for summit to ship me the throttle adapter will get that installed if not tomorrow then thursday and I will have the car back out on the road fir the first time in years.

    That's good news I'm glad it wasn't something fatal. 

    BTW what was wrong with the carburator?  Or is the lesson learned here is $400 of parts will always fix a problem....
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    71 - 383 FC7 Super Bee

    Offline JRoss22

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    Re: Help Choosing New Carb
    « Reply #22 on: May 03, 2006 - 02:27:58 PM »
    I cant remember exactly what was wrong but I think I remember my shop teacher telling me that the accelerator pump was going bad. Which that resulted into it not wanting to start up unless you poured a little gas down the carb to encourage it to start. So ya basically $400 part will fix it. I also didnt want to deal with getting the old carb rebuilt again and have it fail again to eventually just end up buying a new one even after wasting the money on a rebuild.
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    Offline 71383bee

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    Re: Help Choosing New Carb
    « Reply #23 on: May 03, 2006 - 03:59:40 PM »
    Well you're on the right path then for Mopars...just like all of the "help i can't tune my 6 pack" threads lately. 

    The point was that you should have pulled it apart and worked on it yourself.  Too many suposedly "rebuilt by professional" parts out there end up doing what your did....fail.  An accelerator pump is an easy fix and I don't quite see how that can make one whole bank not run.  The point that too many new mopar bretheren do not realize is that these cars take work.  Some days it won't run and you gotta learn to troubleshoot and figure out the problem before running to the summit catalog.  Hell even the "new" parts have a high failure rate.  For example I was in a similar boat you were with a car that had a terrible hesitation from a stop and an erratic idle...well I bought 2 carbs, new wires, a new ignition system all to find out that my low compression 383 likes more initial timing at idle.  Recurve the distributor for 100 bucks and blammo...fixed.  I know way more now the hard way and my wallet is alot lighter too.  If I had only researched and listened to more of the old salts i probably would have fixed it for a lot less. 

    Myself and others may come off as sarcastic, but ultimately we are trying to help. 
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    71 - 383 FC7 Super Bee
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