71 1.7 correct Weber Duals Options

[mrholland2]

Hrmm. . this might be an interesting thing to try since I can probably get the second progressive weber CHEAP on here

Oops - I didn't see the TWO in your question (IMG:style_emoticons/default/blink.gif)

I haven't seen anyone do it, but, if two of them were mounted to separate properly designed intake manifolds with a shorter distance to the combustion chamber, they would work much better than the central manifold system typically utilized.

[Dave_Darling]

I have heard of it being done, and I think I have even seen pics of a manifold set up for two proggies. It was a scan of someone's ad for the setup from a magazine from the 70s or 80s, I believe.

--DD

[rhodyguy]

ferg had a car with dual progressives on it. i think they worked well for him. the dual intakes made all the dif in the world.

[DBCooper]

I have heard of it being done, and I think I have even seen pics of a manifold set up for two proggies. It was a scan of someone's ad for the setup from a magazine from the 70s or 80s, I believe.

Yup, it was a dune buggy thing back in the day of the original Manx and Tow'd. Call CB Performance (Claude's Buggies) and ask, I'm sure there's someone still around who can give you info. Heck, they might even still have some. Back then you could buy cams, build a big "dual" exhaust and port your own heads, but we didn't have the manifolds, linkage, or quite frankly the cash to buy expensive sets of imported Eye-talian carburetors, so dual progressives made sense.

They could run well, but generally their problem was tunability. Jet selection was limited (you had to solder and drill), you couldn't adjust the accelerator pump, the venturis were fixed so no adjustment, the transition from one to two wasn't ever quite right, and they didn't really atomize very well. When the Solexes, then Weber DCNF's and IDF's came on the scene you could adjust them for any engine so they ran ten times better, and dual progressives quickly disappeared. They are cheap, though, that hasn't changed.

[euro911]

You'll need to find or fab a couple of intake adapters because of the choke plate arrangement in the HW carbs.

With one being the primary and the other only a secondary, you need a beveled funnel to combine flow from the two chokes (basically, mini plenums) and then to distribute the flow into a dual port intake.

Here's a quick sketch of what I remember the adapter looked like for a stock single port VW 1600 intake manifold.

[stugray]

I have a complete 1.8L FI setup and a stock cam in good condition I would sell for less than new dual webers. (unless you count the pair that sold for $50 a few months ago (IMG:style_emoticons/default/blink.gif))

If you are good enough with a wrench to break the motor all the way down to replace the cam (IMG:style_emoticons/default/cheer.gif)

Or a 2.0L FI setup for a little more.

[mrholland2]

I'm talkin dual Weber progressives not dual Holley progressives

I have heard of it being done, and I think I have even seen pics of a manifold set up for two proggies. It was a scan of someone's ad for the setup from a magazine from the 70s or 80s, I believe.

Yup, it was a dune buggy thing back in the day of the original Manx and Tow'd. Call CB Performance (Claude's Buggies) and ask, I'm sure there's someone still around who can give you info. Heck, they might even still have some. Back then you could buy cams, build a big "dual" exhaust and port your own heads, but we didn't have the manifolds, linkage, or quite frankly the cash to buy expensive sets of imported Eye-talian carburetors, so dual progressives made sense.

They could run well, but generally their problem was tunability. Jet selection was limited (you had to solder and drill), you couldn't adjust the accelerator pump, the venturis were fixed so no adjustment, the transition from one to two wasn't ever quite right, and they didn't really atomize very well. When the Solexes, then Weber DCNF's and IDF's came on the scene you could adjust them for any engine so they ran ten times better, and dual progressives quickly disappeared. They are cheap, though, that hasn't changed.

[euro911]

They were a collaborative effort - Holley/Weber progressive 2 bbl (as opposed to the Holley synchronous 2 bbl carbs). You could find the H/W progressives with Holley, Weber and Autolite names on them. The one I stuck on a VW bus came off of a 76 Capri 2600 V6 and had Autolite markings.

I'm guessing the Holley Weber you're referring to looks like this?

(IMG:style_emoticons/default/laugh.gif)


Oops, I mean this:




Here's some info from TunaCan:

"Dual two-barrels, progressive opening: Although this is not an option currently available, I felt I had to share this find with everyone. It seems back in the '70s and early '80s, there was a dual progressive carb kit offered for the Type 4 engine. I actually found these manifolds at wrecking yard, but missed the opportunity to buy them. I later found this advertisement in an old isssue of HotVWs. I don't know why they stopped marketing it: it could have been that demand wasn't high enough, carb supply was low, or they could have been difficult to tune. This is all I know about this conversion and rest assure, if I do learn more, I will post it here."



Don't know if Beck Enterprises is still around, but the phone prefix for Gardena is now 562 (IMG:style_emoticons/default/confused24.gif)

[DBCooper]

That's it. I don't think I ever saw the T4 version, but that's the kit. You could get them with either Weber or Holly stamps, the Weber's were cooler. I'm not positive, but I think that was Chuck Beck's earlier life. He moved up later to import the Porsche 550 and other replicars from Brasil.

[arkitect]

Interesting info, I have a progressive carb now and it won't idle I have to keep my foot in it to keep it going.

Dave

[ThePaintedMan]

I'm guessing the Holley Weber you're referring to looks like this?

Yowza, that's a nicer Holley or Weber than I've seen quite a long time - AND she works at my company, DigitalGlobe!


...oh wait, I'm married now. (IMG:style_emoticons/default/biggrin.gif)