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#1
10-29-2012, 07:32 PM
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What is the purpose of these fins
I was looking at my 85 w123 the other day and saw these fins behind the rain gutters on the rear pillar. I am sure you all have seen them.
 Are they for aerodynamics?
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel. Last edited by Silber Adler; 10-30-2012 at 04:22 PM. 
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#2
10-29-2012, 07:36 PM
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Vents, while feeling there, close the door.
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83 SD 84 CD
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#3
10-29-2012, 07:40 PM
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isn't the sunroof drain exit there also?
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1982 300sd from craigslist $800 greased on one tank with NO CONVERSION in the Hot Texas Sun. (currently dead & awaiting engine damage investigation and/or longblock swap) new daily: '03 vw 5speed jetta tdi wagon. bagged&chipped
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#4
10-29-2012, 07:42 PM
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Yes the rear sunroof drains exit there.
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 Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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#5
10-29-2012, 08:36 PM
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That is something that is only on the later cars. My 77 240D doesn't have them.
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#6
10-29-2012, 09:34 PM
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Quote:
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#7
10-29-2012, 11:04 PM
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Quote:
EDIT: I miss read the post and didn't see the fin under the chrome trim fin in the pic. None of the 123's I've owned had that. 77 300D, 78 240D, or the 82 300TD.
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Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
Last edited by Biodiesel300TD; 10-30-2012 at 12:30 PM.
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#8
10-29-2012, 11:11 PM
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My '82 300D doesn't have them, no sunroof. My dad's '83 240D has them, it has a sunroof. Not sure about my '79 240D parts car, which has a sunroof.
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1982 300D Turbodiesel, daily driver. Mods so far: Fram 8038 paper filter, 4 brake light mod, Gen II w126 (front) rotors/calipers, boost turned up to 12lbs, non-egr manifolds, water/methanol injection, 4-speed manual 1980 300SD Turbodiesel, project car, nearly ready to hit the street 1974 240D, New paint
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#9
10-30-2012, 12:39 AM
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My '83 has them, it is equipped with electric sunroof. Did wagons have them too? Our former '81 TD has manual sunroof but no fin in the same location. Same spot on wagons is also for rear sunroof drains.
I read somewhere it is for "cleaning the airflow" behind the vehicle. Somebody drove without them and noticed additional noise at speed. Reinstalled the fins and noise went away. On the same note, some of the W123's leading A-pillar edge had a thicker trim piece, while others had the thin type. Are these two related? 
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#10
10-30-2012, 08:58 AM
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Quote:
 
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#11
10-30-2012, 08:59 AM
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Quote:
I believe they are. My 84 had the fins and the larger leading trim.
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#12
10-30-2012, 10:45 AM
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It may be where the cabin vent is but I think it is shaped with the louver to help with aero. Let out the air in a lower pressure zone. My car also has the wrap around areas on the windshield. My guess is that they were improving the aerodynamics of the car as they made them.
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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#13
10-30-2012, 12:29 PM
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I totally missed the fin behind the chrome trim fin in the first pic. I thought he was talking about the chrome one. Should have read it a little closer. I'll have to fix my statements now. None of the 123's I've ever owned had those. 77 300d, 78240, or the 82 300TD.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#14
10-30-2012, 03:52 PM
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Quote:
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