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janerick3
Samba Member
Joined: June 04, 2006
Posts: 1907
Location: Colorado
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 Posted: Tue Oct 13, 2009 10:24 pm Post subject: 111 129 701B Intake Manifold |
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This appears to be one of the "missing links" between the thin-walled '53-only 25hp manifold and the common, thick-walled 111 129 701E 36hp manifold.
It's painted black, has the thin-wall heat riser tubing and is marked with "30" and the 3x3 part number on the figure-eight casting. It's from my Dec '54 BD 36hp.
The part number is not very clear, especially the "B" on the end.
I suspect this was only used for a short while at the end of 1954. Most have likely burned through years ago and have been replaced by the 701E manifold.
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Jan K. |
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johnshenry
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Joined: September 21, 2001
Posts: 9418
Location: Northwood, NH USA
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| Posted: Wed Oct 14, 2009 8:24 am Post subject: |
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INTERESTING! Just like the "zwitter" one with the hard right hand bend, but with the 701E style shaped heat riser. What is the OD of the heat riser tubing? Should be about 18mm.
Want to sell it? 
Just when I thought I knew about all of the intakes used. Makes me wonder why though that they abandoned the "zwitter" style heat riser. Obviously more heat riser to intake runner contact (on the hot side of the HR) would yield better heat transfer. Did that zwitter version cause other issues like poor access to something? Or did it produce asymmetrical heating of the intake since the longer part was on the hotter side of the heat riser tubing?
Thanks for posting those pics.... a missing link indeed. All of those "figure 8" casting ones I have seen so far are the zwitter style HRs...
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John Henry
'57 Deluxe
'56 Single Cab |
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janerick3
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Joined: June 04, 2006
Posts: 1907
Location: Colorado
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| Posted: Fri Oct 16, 2009 8:51 pm Post subject: |
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| johnshenry wrote: |
| INTERESTING! Just like the "zwitter" one with the hard right hand bend, but with the 701E style shaped heat riser. What is the OD of the heat riser tubing? Should be about 18mm.... |
18mm it is...the heat riser flanges are pressed on...the carb riser is flared...carb flange is press-fit and the intake tubes are 23mm OD.
Progressive Refinements isn't clear when VW went from the vertical hot spot back to the horizontal hot spot in '54. I don't believe the 3x3 part numbers were introduced until the fall of 1954, so the 701B manifolds may also exist with an old-series part number.
I'm guessing the 701E manifold was introduced on 20 April 1955, at Engine No. 1-1038409 and did not get the "30" (for 30hp DIN) marking until 11 July. I'm surprised nobody's unearthed a period service bulletin recommending replacement of all thin-walled 25hp intakes with the "701" and thin-walled 36hp intakes with the 701E, given the scarcity of all pre-'55 intakes.
My low-mileage Jan '54 engine has a non "30" 701E and my extremely original Jan '55 engine has a "30" 701E, suggesting they've both been replaced at some point.
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Jan K. |
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62DoKaGuy
Samba Member
Joined: May 22, 2011
Posts: 1293
Location: Surprise, AZ
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| Posted: Sun Dec 14, 2025 3:46 pm Post subject: Re: 111 129 701B Intake Manifold |
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Revitalizing an older thread:
Anyone able to shed more light on the timeframe or range of engines, i.e. which numbers or months/years, the 111-129-701B manifolds were used? Have a grip of different intakes, and the jacketing on this one caught my eye.
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| EverettB wrote: |
| ...I went at it from both ends but going from the rear didn't seem to do anything, although I did spray some rust breaker in there... |
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johnshenry
Samba Member
Joined: September 21, 2001
Posts: 9418
Location: Northwood, NH USA
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| Posted: Sun Dec 14, 2025 6:25 pm Post subject: Re: 111 129 701B Intake Manifold |
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| 62DoKaGuy wrote: |
Revitalizing an older thread:
Anyone able to shed more light on the timeframe or range of engines, i.e. which numbers or months/years, the 111-129-701B manifolds were used? Have a grip of different intakes, and the jacketing on this one caught my eye.
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I don't see the "B" on the part number on your jacket casting. I think the 701B should have the lateral crease on both sides (like a figure 8 cross section of the casting) and is a thin wall (heat riser) 36hp intake. As in the pics above. ours to me looks like he later 36hp 701E intake, or, of the E is ground off, it is the 25hp replacement version of the 701E. Measure the diameter of the head endcasting face (the part that mates with the copper crush gasket on the head). 1.25" is 36hp, and 1.125" is 25hp.
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John Henry
'57 Deluxe
'56 Single Cab |
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