Wanted Trade Weber 45s for 40s? - Alfa Romeo Bulletin Board & Forums
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post #1 of 18 (permalink) Old 05-08-2019, 12:13 PM Thread Starter
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Trade Weber 45s for 40s?

My new Junior Z came with Weber 45DCOE18 on it, 38mm throats, too much carb for the engine. Work fine, I just want to downsize. Just drove 500 miles, no issues. I'd be happy to trade for a comparable good pair of 40DCOE32 or 72, set up for a 2000, 32 or 33mm throats. If interested, let me know.
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post #2 of 18 (permalink) Old 05-08-2019, 12:36 PM Thread Starter
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I was advised, and failed to look first, that these are GTA Jr carbs. So I'm having to rethink this. Value should be much greater than run of the mill 40s.
Thank you.
Andrew
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post #3 of 18 (permalink) Old 05-08-2019, 04:03 PM
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Andrew, from previous posts you might want to dissect this motor before you start selling/changing out parts. Did I hear there was possible involvement of Autodelta with this motor?
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post #4 of 18 (permalink) Old 05-08-2019, 06:04 PM
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Don't take them off. Try 34 or 36 venturis ... My 2 liter in my TI is perfectly tractable with 36mm venturis from low revs with a 2.54 1st gear.

IMO a slightly massaged 2 liter is somewhat undercarbed with 32 or 33mm venturis.

If they are really GTAjunior carbs it also makes the AD connection more likely ...
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post #5 of 18 (permalink) Old 05-09-2019, 06:30 AM
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Completely agree, Andrew keep the carbs & choke them down. It's not the carbs that are your problem, it's the chokes.
Go down to 34mm chokes and you'll see a huge difference.

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post #6 of 18 (permalink) Old 05-09-2019, 06:32 AM Thread Starter
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Yes, thanks. Rethinking.
A Super with 2000 I had had 45DCOE14 on it, choked down to 30, didn't run for heck. Probably more fundamental problems, but I went through and swapped in original Super carbs, set up to Alfa's 2000 specs, ran like it should.
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post #7 of 18 (permalink) Old 05-09-2019, 06:39 AM Thread Starter
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Heck, there's an AD sticker on the underside of the hood! (from after the 2013 repaint).
Underneath there is no evidence of racing mods, roll bar, cage, nothing. If this was a hillclimber or similar, maybe would not have had such mods in period.
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post #8 of 18 (permalink) Old 05-09-2019, 06:41 AM
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My 2L has 45's with 36 venturis and it is well behaved and easy to drive.

Ed Prytherch
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #9 of 18 (permalink) Old 05-10-2019, 07:08 AM
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42 dcoe's may be the sweet spot for a warm up road 2L car? anyone ever tried? :-)
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post #10 of 18 (permalink) Old 05-10-2019, 07:44 AM
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Quote:
Originally Posted by davbert View Post
42 dcoe's may be the sweet spot for a warm up road 2L car? anyone ever tried? :-)
Yes, have tried 42 DCOE's (They're very few & far between now, and rarely come up for sale). In the UK, they used to be a favourite for Triumph TR2, 3 & 4 engines.
TBH I didn't notice a difference between them and the 40's, so they were sold years ago to a TR4 guy.

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post #11 of 18 (permalink) Old 05-10-2019, 05:50 PM
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40s for sale w/ intake & air box

PM if interested

79 Alfetta - Sprint Veloce - Bronze
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post #12 of 18 (permalink) Old 05-10-2019, 07:25 PM
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Quote:
Originally Posted by GTA R View Post
Yes, have tried 42 DCOE's (They're very few & far between now, and rarely come up for sale). In the UK, they used to be a favourite for Triumph TR2, 3 & 4 engines.
TBH I didn't notice a difference between them and the 40's, so they were sold years ago to a TR4 guy.
The not-well-kept secret inside BAP/Geon in the 70s (the sole US Weber importer at that time) was that the only reason we offered 42s was because Weber made a bunch of them for some Maserati that didnít produce the volume expected, so we bought the load cheap. We specced them for 240/260Zs and unloaded them.

Don P
Carson City, NV

Past Alfas...
59 102 Touring (first Alfa $500 running)
65 Sprint GT (2nd Alfa, $500 daily driver)
102 Sprint (never did anything with it, but wish I had)
74 Berlina (first new car - now certainly rusted into oblivion)
61 Giulietta Spider G-Prod Race Car (where is it now?)
84 Spider Veloce (rarely drove it, so sold it)
86 Quadrifoglio (Dull car - no more 115s for me)
1971 Montreal "The Full Monty". Fair winds and following seas

Current Alfas
59 102 Touring Roadster - restoration complete, enough Alfa for any rational man. Or irrational, for that matter
Oops. Add to the "present" list, 10204 01488, 2000 Touring Roadster project

And past...
Two 1946 Stampe SV4C (c/n 294 "Rocinante" - wife's favorite airplane. RIP), and c/n 235 "La Bon Temps Femme" (gone to a new home, but never forgotten)
Zlin 50LA (+9 -6 gees, titanium spar, 1200 lbs, 260HP rumored to now be in Brazil)
1946 Luscombe 8A
Starduster Too (recently spotted at the Nevada City, CA airport - over 20 years and an entire continent separating it from our stewardship in Binghamton, NY)
1955 Cessna 170B (wife taught me to fly tailwheel in this)

And present...
64 Mooney M20E ("Rambo". My faithful steed for over 40 years) Over 55 years old, and just returned from a trip to Argentina in him
Newest in the fleet
1967 Piper Super Cub on Wipline amphibious floats (a true "all terrain vehicle")
2010 Triumph Thunderbird


You can snap roll an Alfa only one time...
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post #13 of 18 (permalink) Old 05-10-2019, 07:29 PM
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BTW, Iíve got a pair of very low mileage/recently overhauled 40 DCOMs Iíd trade for 45s. Iíd toss in some cash. I took them off my car when I converted to 45s and high lift cams. They had maybe 3,000 miles on them at that point since I bought them overhauled from Alfa1750 in Europe.

Don P
Carson City, NV

Past Alfas...
59 102 Touring (first Alfa $500 running)
65 Sprint GT (2nd Alfa, $500 daily driver)
102 Sprint (never did anything with it, but wish I had)
74 Berlina (first new car - now certainly rusted into oblivion)
61 Giulietta Spider G-Prod Race Car (where is it now?)
84 Spider Veloce (rarely drove it, so sold it)
86 Quadrifoglio (Dull car - no more 115s for me)
1971 Montreal "The Full Monty". Fair winds and following seas

Current Alfas
59 102 Touring Roadster - restoration complete, enough Alfa for any rational man. Or irrational, for that matter
Oops. Add to the "present" list, 10204 01488, 2000 Touring Roadster project

And past...
Two 1946 Stampe SV4C (c/n 294 "Rocinante" - wife's favorite airplane. RIP), and c/n 235 "La Bon Temps Femme" (gone to a new home, but never forgotten)
Zlin 50LA (+9 -6 gees, titanium spar, 1200 lbs, 260HP rumored to now be in Brazil)
1946 Luscombe 8A
Starduster Too (recently spotted at the Nevada City, CA airport - over 20 years and an entire continent separating it from our stewardship in Binghamton, NY)
1955 Cessna 170B (wife taught me to fly tailwheel in this)

And present...
64 Mooney M20E ("Rambo". My faithful steed for over 40 years) Over 55 years old, and just returned from a trip to Argentina in him
Newest in the fleet
1967 Piper Super Cub on Wipline amphibious floats (a true "all terrain vehicle")
2010 Triumph Thunderbird


You can snap roll an Alfa only one time...
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post #14 of 18 (permalink) Old 05-11-2019, 03:26 AM
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Quote:
Originally Posted by DPeterson3 View Post
The not-well-kept secret inside BAP/Geon in the 70s (the sole US Weber importer at that time) was that the only reason we offered 42s was because Weber made a bunch of them for some Maserati that didnít produce the volume expected, so we bought the load cheap. We specced them for 240/260Zs and unloaded them.
Yes, they were originally made by Weber for the Maserati 3500GT, then afterwards recommended by Weber as aftermarket fitment for the Triumph TR2, 3, & 4 , Ford Pinto 2000cc, and Volvo B18 engine.

GTA R
1963 Giulia Ti Super Rep
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post #15 of 18 (permalink) Old 05-11-2019, 06:27 AM Thread Starter
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Just talked to Dan Marvin at Norman. He said when they built a hottish 2000 for Jon Norman years ago, with 36mm throats it had not much at the low end on the dyno. Went down to 34 and driveability went up a lot, lost maybe 2-3 hp at the top end. So yes, I'm not tracking this car, will be happy to trade high end for low and mid range.
Andrew
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