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1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE 120-130 1966

posted by JohnMc on Tue Jul 8 13:37 CST 2014
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last visit: Thu Oct 23 07:42 CST 2014

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My old 1800E did the same thing with a flat exhaust lobe. It would start just fine, had great even compression, and would run normally at low throttle/rpm. But as soon as the pedal went down, or the revs got a little higher, lots of backfires.

This was a headscratcher for me for a while until I noticed one of the rockers not moving up and down much at all while I set the valve clearances for the Nth time.

I'm assuming that at higher RPM's the cylinder simply couldn't exhaust very well, and when the fresh intake charge came in there was still a fair amount of hot exhaust in there, enough to light off the intake charge immediately.

By the time I figured that out, the cam lobe was *really* flat.
--
'63 PV544 rat rod, '93 Classic #1141 245 (now w/16V turbo)

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1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
posted by rotovate on Tue Jul 1 18:19 CST 2014 >

1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
posted by onstottc on Tue Jul 1 19:26 CST 2014 > V
- 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
  posted by rotovate on Tue Jul 1 21:59 CST 2014 > V

1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
posted by riverbend subscriber on Tue Jul 1 20:34 CST 2014 > V
- 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
  posted by rotovate on Tue Jul 1 22:04 CST 2014 > V
  - 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
    posted by someone claiming to be 63pv on Wed Jul 2 06:23 CST 2014 > V
    - 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
      posted by Volvo From Heck subscriber on Wed Jul 2 06:51 CST 2014 > V
      - 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
        posted by rotovate on Wed Jul 2 08:45 CST 2014 > V
        
        1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
        posted by planetman on Wed Jul 2 09:09 CST 2014 > V
        
        1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
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        1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
        posted by Phil S. on Wed Jul 2 11:21 CST 2014 > V
        
        1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
        posted by derek uk subscriber on Thu Jul 3 05:34 CST 2014 > V
        
        1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
        posted by rotovate on Thu Jul 3 09:19 CST 2014 > V
        
        1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
        posted by northNH on Thu Jul 3 23:24 CST 2014 > V
        
        1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
        posted by matt b on Fri Jul 4 08:02 CST 2014 > V
        
        1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
        posted by phonemanjames subscriber on Mon Jul 7 16:59 CST 2014 > V
      - 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
        posted by kittysgreyvolvo subscriber on Thu Jul 3 23:20 CST 2014 > V
      - 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE
        posted by kittysgreyvolvo subscriber on Thu Jul 3 23:20 CST 2014 > V

1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
posted by Dylan Berichon on Thu Jul 3 14:00 CST 2014 > V

1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
posted by B20Paul. subscriber on Fri Jul 4 12:11 CST 2014 > V
- 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
  posted by Phil S. on Fri Jul 4 15:39 CST 2014 > V
  - 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
    posted by JohnMc on Tue Jul 8 13:37 CST 2014 > V

1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
posted by phonemanjames subscriber on Thu Jul 10 13:02 CST 2014 > V

1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
posted by patrick of montreal on Fri Jul 11 05:24 CST 2014 > V

1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
posted by rotovate on Sat Jul 19 21:03 CST 2014 > V
- 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
  posted by planetman on Sun Jul 20 11:16 CST 2014 > V
  - 1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE [120-130][1966]
    posted by JohnMc on Tue Jul 22 20:49 CST 2014 > V

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Volvo RWD 120-130 Forum

1966 122S PERSISTENT INTAKE MANIFOLD BACKFIRE 120-130 1966