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Twin SU carbs' pistons supposed to rise in sync? 120-130

posted by BoostdRex on Mon Apr 6 08:15 CST 2009
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last visit: Fri Apr 27 23:30 CST 2012

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Ok, I had trouble with this before. I have since the replaced the gaskets between the carbs and manifold, sandwiching the heat shield between 2 gaskets on each carb and torquing the nuts to spec. Did this yesterday.

Also yesterday, I synced the carbs with sync tool for idle airflow. Ok, looked good. I then applied some throttle pressure and noticed only one carb's piston (rear) would rise a lot more freely than the other (front) when I would rev it. I killed the car, checked the oil in the dashpots, they were full. Applied some pressure upwards with my finger to the pistons and it took a lot more force to lift the front than the rear, alot more dampening force on it.

Emplied the dashpots, screwed down the caps, and lifted and both lifted freely, no problem. Replaced the oil in the dashpots, screwed down the caps and same scenerio - the front won't lift as much but the rear will. Throttle application would move the rear but hardly the front at all.

Any ideas?

This is my original post that I was unable to add to: http://www.brickboard.com/RWD/volvo/1330524/120-130/twin_su_carbs_b20b_dampers_supposed_move_sync.html

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Twin SU carbs' pistons supposed to rise in sync? [120-130]
posted by BoostdRex on Mon Apr 6 08:15 CST 2009 >

Twin SU carbs' pistons supposed to rise in sync? [120-130]
posted by Rhys on Mon Apr 6 09:27 CST 2009 > V
- Twin SU carbs' pistons supposed to rise in sync? [120-130]
  posted by BoostdRex on Wed Apr 8 14:09 CST 2009 > V
  - Twin SU carbs' pistons supposed to rise in sync? [120-130]
    posted by Rhys on Wed Apr 8 16:09 CST 2009 > V
    - Twin SU carbs' pistons supposed to rise in sync? [120-130]
      posted by BoostdRex on Wed Apr 8 17:05 CST 2009 > V
      - Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Rhys on Wed Apr 8 18:34 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Thu Apr 9 02:58 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Rhys on Thu Apr 9 03:33 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Thu Apr 9 07:13 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by derek uk subscriber on Fri Apr 10 00:45 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Fri Apr 10 05:19 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Rhys on Fri Apr 10 05:49 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Fri Apr 10 10:57 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Rhys on Fri Apr 10 16:56 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Fri Apr 10 17:19 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Rhys on Fri Apr 10 19:59 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Mon Apr 13 07:23 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Rhys on Mon Apr 13 07:31 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Mon Apr 13 07:39 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Rhys on Mon Apr 13 10:57 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by derek uk subscriber on Fri Apr 10 23:57 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Ron Kwas on Sat Apr 11 00:52 CST 2009 > V
        
        pb blaster [120-130]
        posted by 1966-estate on Sat Apr 11 01:04 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Sat Apr 11 11:57 CST 2009 > V

Twin SU carbs' pistons supposed to rise in sync? [120-130]
posted by derek uk subscriber on Mon Apr 6 23:17 CST 2009 > V
- Twin SU carbs' pistons supposed to rise in sync? [120-130]
  posted by BoostdRex on Wed Apr 8 13:57 CST 2009 > V

Twin SU carbs' pistons supposed to rise in sync? [120-130]
posted by 122_Canadian on Tue Apr 7 05:34 CST 2009 > V

Twin SU carbs' pistons supposed to rise in sync? [120-130]
posted by Ron Kwas on Wed Apr 8 23:15 CST 2009 > V

Twin SU carbs' pistons supposed to rise in sync? [120-130]
posted by BoostdRex on Fri Apr 10 14:30 CST 2009 > V
- "Rebuilt' Means Different Things to Different People [120-130]
  posted by RepairmanJackal subscriber on Sat Apr 11 02:53 CST 2009 > V
  - "Rebuilt' Means Different Things to Different People [120-130]
    posted by BoostdRex on Sat Apr 11 12:07 CST 2009 > V
    - What The....? [120-130]
      posted by RepairmanJackal subscriber on Sat Apr 11 14:15 CST 2009 > V
      - What The....? [120-130]
        posted by BoostdRex on Sat Apr 11 14:28 CST 2009 > V
        
        What The....? [120-130]
        posted by spectratone on Sat Apr 11 15:31 CST 2009 > V
        
        What The....? [120-130]
        posted by BoostdRex on Sun Apr 12 11:28 CST 2009 > V
    - crankcase venting [120-130]
      posted by Rhys on Sat Apr 11 14:41 CST 2009 > V
      - crankcase venting [120-130]
        posted by BoostdRex on Mon Apr 13 02:54 CST 2009 > V
        
        crankcase venting [120-130]
        posted by Rhys on Mon Apr 13 07:29 CST 2009 > V
        
        crankcase venting [120-130]
        posted by BoostdRex on Mon Apr 13 10:12 CST 2009 > V
        
        crankcase venting [120-130]
        posted by Rhys on Mon Apr 13 10:56 CST 2009 > V
        
        crankcase venting [120-130]
        posted by BoostdRex on Mon Apr 13 15:46 CST 2009 > V
        
        you're confused.... [120-130]
        posted by Rhys on Mon Apr 13 19:14 CST 2009 > V
        
        you're confused.... [120-130]
        posted by BoostdRex on Tue Apr 14 02:35 CST 2009 > V
        
        you're confused.... [120-130]
        posted by derek uk subscriber on Tue Apr 14 07:51 CST 2009 > V
        
        you're confused.... [120-130]
        posted by BoostdRex on Tue Apr 14 08:01 CST 2009 > V
        
        you're confused.... [120-130]
        posted by Volvo From Heck subscriber on Wed Apr 15 10:54 CST 2009 > V
        
        you're confused.... [120-130]
        posted by BoostdRex on Wed Apr 15 14:31 CST 2009 > V
        
        weighing in(again) [120-130]
        posted by RepairmanJackal subscriber on Wed Apr 15 15:53 CST 2009 > V
        
        weighing in(again) [120-130]
        posted by BoostdRex on Thu Apr 16 03:28 CST 2009 > V
        
        Not a bad move [120-130]
        posted by RepairmanJackal subscriber on Thu Apr 16 12:08 CST 2009 > V
        
        Not a bad move [120-130]
        posted by Volvo From Heck subscriber on Thu Apr 16 15:24 CST 2009 > V
        
        Not a bad move [120-130]
        posted by BoostdRex on Thu Apr 16 17:07 CST 2009 > V
        
        Not a bad move [120-130]
        posted by derek uk subscriber on Thu Apr 16 23:10 CST 2009 > V
        
        Not a bad move [120-130]
        posted by BoostdRex on Fri Apr 17 01:56 CST 2009 > V
        
        Not a bad move [120-130]
        posted by BoostdRex on Sun Apr 19 18:10 CST 2009 > V
      - crankcase venting [120-130]
        posted by Dolores67 subscriber on Thu Apr 16 07:55 CST 2009 > V
        
        crankcase venting [120-130]
        posted by BoostdRex on Thu Apr 16 10:07 CST 2009 > V
        
        PCV valve part no. [120-130]
        posted by uncle_bagley subscriber on Fri Apr 17 00:56 CST 2009 > V
        
        PCV valve part no. [120-130]
        posted by BoostdRex on Fri Apr 17 01:45 CST 2009 > V

Twin SU carbs' pistons supposed to rise in sync? [120-130]
posted by Patrick of Mtl on Sat Apr 11 01:14 CST 2009 > V

Twin SU carbs' pistons supposed to rise in sync? [120-130]
posted by B20Paul. subscriber on Sat Apr 11 05:17 CST 2009 > V

Twin SU carbs' pistons supposed to rise in sync? [120-130]
posted by BoostdRex on Sat Apr 11 12:09 CST 2009 > V
- Twin SU carbs' pistons supposed to rise in sync? [120-130]
  posted by spectratone on Sat Apr 11 13:49 CST 2009 > V
  - Twin SU carbs' pistons supposed to rise in sync? [120-130]
    posted by BoostdRex on Sat Apr 11 14:07 CST 2009 > V
    - Twin SU carbs' pistons supposed to rise in sync? [120-130]
      posted by derek uk subscriber on Sat Apr 11 23:11 CST 2009 > V
- Twin SU carbs' pistons supposed to rise in sync? [120-130]
  posted by Volvo From Heck subscriber on Sat Apr 11 15:07 CST 2009 > V
  - Twin SU carbs' pistons supposed to rise in sync? [120-130]
    posted by BoostdRex on Mon Apr 13 02:59 CST 2009 > V
    - Twin SU carbs' pistons supposed to rise in sync? [120-130]
      posted by Volvo From Heck subscriber on Mon Apr 13 09:02 CST 2009 > V
      - Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Mon Apr 13 10:20 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Volvo From Heck subscriber on Mon Apr 13 14:56 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Mon Apr 13 15:37 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Volvo From Heck subscriber on Tue Apr 14 03:24 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Tue Apr 14 04:47 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by Volvo From Heck subscriber on Tue Apr 14 07:46 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Tue Apr 14 08:06 CST 2009 > V
        
        Crap, this thing is missing!!! [120-130]
        posted by BoostdRex on Tue Apr 14 13:09 CST 2009 > V
        
        Crap, this thing is missing!!! [120-130]
        posted by Volvo From Heck subscriber on Tue Apr 14 13:18 CST 2009 > V
      - Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by spectratone on Mon Apr 13 13:56 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Tue Apr 14 05:14 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by spectratone on Tue Apr 14 13:58 CST 2009 > V
        
        Twin SU carbs' pistons supposed to rise in sync? [120-130]
        posted by BoostdRex on Tue Apr 14 14:04 CST 2009 > V

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Twin SU carbs' pistons supposed to rise in sync? 120-130