1.1 liter dual carb vac connections

[Opelmn70]

After years of working with 1.9's, I have decided to try my hand at a 1.1 GT given to me. My question is in regards to the connections of the vacuum hoses on the passenger side of the dual carb manifold(original solex). A picture speaks a thousand words, but my camera has decided to hide itself somewhere. I see 4 connections, and if someone could direct me as to what they connect to, it would be helpful. The original hoses had disintegrated. To describe, (1) 1/8 in. off of vacuum booster hose fitting, (1) 1/4 in. at center of intake below carbs. (1) 5/16in. next to idle speed screw(on diaphram housing), and (1) 1/4 in. on rear of front solex carb. From my understanding and what was left of the hoses and sizes, the front carb hose should connect to distributor advance/retard bell and 1/8 in. on booster is "T"'d to fitting on drivers side of diaphram housing and distributor advance/ retard bell. The others are unknown.
Thanks
Gerry

[opelbits]

Hey-

Check your pm's.

Tony P.

[greenopelgt]

I have an original 1.1 L with dual carbs. I am out of town right now but I will respond ASAP. Hope this will help you.

[tekenaar]

Originally Posted by Opelmn70 After years of working with 1.9's, I have decided to try my hand at a 1.1 GT given to me. My question is in regards to the connections of the vacuum hoses on the passenger side of the dual carb manifold(original solex). A picture speaks a thousand words, but my camera has decided to hide itself somewhere. I see 4 connections, and if someone could direct me as to what they connect to, it would be helpful. The original hoses had disintegrated. To describe, (1) 1/8 in. off of vacuum booster hose fitting, (1) 1/4 in. at center of intake below carbs. (1) 5/16in. next to idle speed screw(on diaphram housing), and (1) 1/4 in. on rear of front solex carb. From my understanding and what was left of the hoses and sizes, the front carb hose should connect to distributor advance/retard bell and 1/8 in. on booster is "T"'d to fitting on drivers side of diaphram housing and distributor advance/ retard bell. The others are unknown. Thanks Gerry

. . . does this help?

[greenopelgt]

That's a great illustration Otto has provided. If just checked my photo gallery and I have about 4 engine compartment pictures that may help until I get home sometime next week. I guess you just go to member photo gallery and click G and go down to greenopelgt and click on the picture to the right.

[Opelmn70]

Thanks Otto and Tom,
the brass tubing was missing on the front carb. It appears to be approx 5/16" in outside diameter. I am sure it is metric in size, but I think 5/16 will be close enough to shave to fit, as long as the wall of the tubing are thick. The lower intake connection may go to the rubber vertical tube from the valve cover and air cleaner assembly. There is another tube of about the same size from the air cleaner (5/16") that is still a mystery, though this one is far less crucial for the car to run without a vac leak.

Tom, if you can send me a few close up pics of the original set up, it would solve this question as well(maybe a "T" in the line?).
I appreciate the info.
Otto, where did you get that illustration? The FSM that I have for 69 didn't have that one.
Gerry

[kevinfier]

Gerry,
I would use the 1970 FSM for tuning the 1.1l. It has instructions on base line tuning that is not in the 69 FSM.
HTH
Kevin

[Opelmn70]

I looked in the 70 FSM and what a difference. I will definitely use this for tuning. However, in looking at my stash of 1.1 manifolds I noticed one for dual carbs without the solenoid. Just a plate where it should be. One of the vac ports of the driver's side is also eliminated. Was this from a Kadett? Could this be used in place of the solenoid one if the diaphram is worn? I have been told that the diaphram is impossible to find. What would be the difference in performance?
Gerry

[GTJIM]

The solenoid is driven by a very rudimentary 'computer' and is there to allow much leaner jetting in the carbs by enriching the mix at WOT and idle.

If you have a manifold and carbs without that set-up ... then use it ... as there will be far better performance and power without it.

Just be aware that the earlier Kadett carbs from manifolds that do not have the enriching solenoid are considerably different from the GT carbs. The GT carbs are basically sealed units to stop tampering with idle and fuel mix to comply with emissions. The earlier carbs are quite tunable in comparison.

[tekenaar]

Originally Posted by Opelmn70 Thanks Otto and Tom, the brass tubing was missing on the front carb. It appears to be approx 5/16" in outside diameter. I am sure it is metric in size, but I think 5/16 will be close enough to shave to fit, as long as the wall of the tubing are thick. The lower intake connection may go to the rubber vertical tube from the valve cover and air cleaner assembly. There is another tube of about the same size from the air cleaner (5/16") that is still a mystery, though this one is far less crucial for the car to run without a vac leak. Tom, if you can send me a few close up pics of the original set up, it would solve this question as well (maybe a "T" in the line?). I appreciate the info. Otto, where did you get that illustration? The FSM that I have for 69 didn't have that one. Gerry

Even though in a Kadett, does this help? . . .

[Mike Trout]

I also have a 69 1.1 Liter I have my carbs off right now but they are still on the manifold with the hoses still attached, Tom and I have disussed back and forth are 1.1's because theres not to many of them. I may have some pictures of it in my gallery for you take a look if not let me know and I can walk you through it over the phone or via webcam.

Mike,