Volvo RWD 120-130 Forum

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Do the math 120-130

posted by B20Paul. on Fri Oct 19 04:59 CST 2007
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last visit: Mon Oct 20 10:54 CST 2014

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Here’s the scale I use:

Info from:

Notice that Volvo used 45mm carburettors for the 140HP engine.

My own Dellorto equipped B20's did put out more power than a B30E on the same dyno & at the same rpms largely paralleling Volvo's Factory engines.

If you do the math, you will see that two 40DCOE Webers will flow a heck of a lot more air than two SU HS6s: 2 x HS6 = 2 x 1 3/4" = 2 x 44.5 mm = 2 x 13.96 sq. cm. = 27. 92 sq. cm. total area…...

Your maths is flawed, your statement is only true if all 4 throats feed in to a common manifold & can all feed one cylinder at a time. On a typical Weber manifold, they can’t. Likewise with twin SU’s, the front SU can only feed the front cylinders, and the rear SU can only feed the rear pair.

Your anecdote is kind of pointless, you don’t mention the size of the SU’s or the Webers used. Here’s an anecdote of my own: A friend of mine actually fitted a borrowed pair of 40mm DCOE’s to his car, then took them back off & put his HIF6’s back on because they made more HP & here’s why:

Webers only make more power than SU’s when they flow a similar amount of air. 40mm DCOE are the right size for a 1600cc Alfa or similar sized engine, but they are only enough for a standard 2000cc Alfetta.

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Drag coefficient for a 122 [120-130]
posted by uncle_bagley subscriber on Tue Oct 9 17:22 CST 2007 >

Drag coefficient for a 122 [120-130]
posted by B20Paul. subscriber on Tue Oct 9 20:18 CST 2007 > V
- Drag coefficient for a 122 [120-130]
  posted by JohnMc on Wed Oct 10 01:13 CST 2007 > V
  - Drag coefficient for a 122 [120-130]
    posted by walrus3 subscriber on Wed Oct 10 08:35 CST 2007 > V
    - Drag coefficient for a 122 [120-130]
      posted by Gary L subscriber on Wed Oct 10 14:07 CST 2007 > V
      - Drag coefficient for a 122 [120-130]
        posted by T.Lyttle on Wed Oct 10 14:59 CST 2007 > V
  - Drag coefficient for a 122 [120-130]
    posted by B20Paul. subscriber on Thu Oct 11 18:02 CST 2007 > V
- Drag coefficient for a 122 [120-130]
  posted by uncle_bagley subscriber on Wed Oct 10 08:50 CST 2007 > V
  - Drag coefficient for a 122 [120-130]
    posted by B20Paul. subscriber on Thu Oct 11 17:30 CST 2007 > V
    - Drag coefficient for a 122 [120-130]
      posted by EJO on Thu Oct 11 23:56 CST 2007 > V

Drag coefficient for a 122 [120-130]
posted by sdewolfe subscriber on Tue Oct 9 21:39 CST 2007 > V
- Drag coefficient for a 122 [120-130]
  posted by uncle_bagley subscriber on Wed Oct 10 08:49 CST 2007 > V

Drag coefficient for a 122 [120-130]
posted by someone claiming to be nate on Wed Oct 10 09:38 CST 2007 > V
- Drag coefficient for a 122 [120-130]
  posted by Gary L subscriber on Wed Oct 10 11:00 CST 2007 > V

Drag coefficient for a 122 [120-130]
posted by Gary L subscriber on Wed Oct 10 10:45 CST 2007 > V
- Drag coefficient for a 122 - Gary (and others) were right! [120-130]
  posted by uncle_bagley subscriber on Mon Oct 15 04:53 CST 2007 > V
  - Drag coefficient for a 122 - Gary (and others) were right! [120-130]
    posted by Gary L subscriber on Mon Oct 15 10:29 CST 2007 > V

Drag coefficient for a 122 [120-130]
posted by JohnMc on Thu Oct 11 02:16 CST 2007 > V
- Drag coefficient for a 122 [120-130]
  posted by Champ 6 on Thu Oct 11 08:45 CST 2007 > V
  - Drag coefficient for a 122 [120-130]
    posted by JohnMc on Thu Oct 11 09:02 CST 2007 > V
- Yeah, but... [120-130]
  posted by Phil S. on Thu Oct 11 09:40 CST 2007 > V
  - Yeah, but... [120-130]
    posted by JohnMc on Fri Oct 12 02:04 CST 2007 > V
- Drag coefficient for a 122 [120-130]
  posted by B20Paul. subscriber on Thu Oct 11 18:10 CST 2007 > V
  - Drag coefficient for a 122 [120-130]
    posted by KLR142 on Thu Oct 11 20:11 CST 2007 > V
    - Drag coefficient for a 122 [120-130]
      posted by B20Paul. subscriber on Fri Oct 12 04:27 CST 2007 > V
      - Drag coefficient for a 122 [120-130]
        posted by JohnMc on Fri Oct 12 05:28 CST 2007 > V
        
        Drag coefficient for a 122 [120-130]
        posted by B20Paul. subscriber on Fri Oct 12 05:53 CST 2007 > V
        
        Drag coefficient for a 122 [120-130]
        posted by JohnMc on Fri Oct 12 07:38 CST 2007 > V
        
        Drag coefficient for a 122 [120-130]
        posted by B20Paul. subscriber on Sun Oct 14 03:02 CST 2007 > V
        
        Drag coefficient for a 122 [120-130]
        posted by JohnMc on Mon Oct 15 02:01 CST 2007 > V
  - Drag coefficient for a 122 [120-130]
    posted by JohnMc on Fri Oct 12 01:52 CST 2007 > V
    - Drag coefficient for a 122 [120-130]
      posted by B20Paul. subscriber on Fri Oct 12 04:17 CST 2007 > V
      - Drag coefficient for a 122 [120-130]
        posted by JohnMc on Fri Oct 12 05:21 CST 2007 > V
        
        Drag coefficient for a 122 [120-130]
        posted by B20Paul. subscriber on Fri Oct 12 06:02 CST 2007 > V
        
        Drag coefficient for a 122 [120-130]
        posted by JohnMc on Fri Oct 12 07:46 CST 2007 > V
  - Drag coefficient for a 122 [120-130]
    posted by Blue Horse on Fri Oct 12 14:15 CST 2007 > V
    - Drag coefficient for a 122 [120-130]
      posted by B20Paul. subscriber on Sun Oct 14 02:59 CST 2007 > V
      - Do the math [120-130]
        posted by Blue Horse on Mon Oct 15 00:27 CST 2007 > V
        
        Do the math [120-130]
        posted by lee subscriber on Mon Oct 15 03:27 CST 2007 > V
        
        Do the math [120-130]
        posted by B20Paul. subscriber on Fri Oct 19 04:59 CST 2007 > V
        
        Do the math [120-130]
        posted by KLR142 on Fri Oct 19 16:13 CST 2007 > V
        
        Do the math [120-130]
        posted by JohnMc on Mon Oct 22 07:36 CST 2007 > V
        
        Do the math [120-130]
        posted by KLR142 on Mon Oct 22 21:15 CST 2007 > V
        
        Do the math [120-130]
        posted by B20Paul. subscriber on Mon Oct 22 23:27 CST 2007 > V
        
        Do the math [120-130]
        posted by KLR142 on Tue Oct 23 19:08 CST 2007 > V
        
        Kyle, he's talking about the single weber downdraft manifold. You've seen one (Pic link inside) [120-130]
        posted by someone claiming to be hudson on Fri Oct 26 03:24 CST 2007 > V
        
        Kyle, he's talking about the single weber downdraft manifold. You've seen one (Pic link inside) [120-130]
        posted by B20Paul. subscriber on Fri Oct 26 18:50 CST 2007 > V
        
        Gotcha... [120-130]
        posted by KLR142 on Sat Oct 27 08:10 CST 2007 > V
        
        Gotcha... [120-130]
        posted by B20Paul. subscriber on Sat Oct 27 08:38 CST 2007 > V
        
        Gotcha... [120-130]
        posted by KLR142 on Sat Oct 27 13:23 CST 2007 > V
        
        Gotcha... [120-130]
        posted by JohnMc on Mon Oct 29 02:18 CST 2007 > V
        
        Staggered Ram [120-130]
        posted by B20Paul. subscriber on Mon Oct 29 19:30 CST 2007 > V
        
        Do the math [120-130]
        posted by B20Paul. subscriber on Mon Oct 22 23:35 CST 2007 > V
        
        Do the math [120-130]
        posted by JohnMc on Tue Oct 23 02:09 CST 2007 > V
        
        Do the math [120-130]
        posted by B20Paul. subscriber on Tue Oct 23 04:19 CST 2007 > V
        
        Do the math [120-130]
        posted by JohnMc on Thu Oct 25 01:55 CST 2007 > V
        
        Do the math [120-130]
        posted by Blue Horse on Thu Oct 25 10:38 CST 2007 > V
        
        Do the math [120-130]
        posted by B20Paul. subscriber on Fri Oct 26 19:46 CST 2007 > V
        
        Do the math [120-130]
        posted by JohnMc on Mon Oct 29 02:13 CST 2007 > V
        
        Do the math [120-130]
        posted by B20Paul. subscriber on Mon Oct 29 18:46 CST 2007 > V

Drag coefficient for a 122 [120-130]
posted by uncle_bagley subscriber on Fri Oct 12 05:08 CST 2007 > V
- measured Drag for a 222 [120-130]
  posted by lars young on Sun Oct 28 05:57 CST 2007 > V
  - measured Drag for a 222 [120-130]
    posted by uncle_bagley subscriber on Sun Oct 28 13:49 CST 2007 > V
    - measured Drag for a 222 [120-130]
      posted by JohnMc on Mon Oct 29 02:15 CST 2007 > V
      - measured Drag for a 222 [120-130]
        posted by KLR142 on Mon Oct 29 06:14 CST 2007 > V
        
        measured Drag for a 222 [120-130]
        posted by someone claiming to be lars young on Wed Oct 31 13:13 CST 2007 > V

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Volvo RWD 120-130 Forum

Do the math 120-130