I have a hose that is not connected to anything and I was wondering where it went. From what the picture says in the Hayens Repair Manual they say its the vacuum hose but where does it connect too?
(http://i5.photobucket.com/albums/y157/1969luvbug/th_ControlVavle.bmp) (http://i5.photobucket.com/albums/y157/1969luvbug/ControlVavle.bmp)
On the Carb there are 3 places for vacum hoses, 2 in the middle and one at the bottom. The bottom one is plugged. The 2 in the middle are side by side, the one on the left runs to the distributor and the one on the right runs to the control valve. That is how my 1970 is set up, hope this helps.
We only had 2 small vacuum hoses on Our Solex PICT Carburetors.. One for the distributor and the other one for the Control valve.... I don't really know what this small vacuum hose does....
It may help the control valve in some way..... ??
I haven't pulled a control valve apart as yet... to see what the small vacuum hose does.....
Just make sure that the hose connection on the carburetor is blocked off if its NOT being used...
Lee Noonan 68AutoBug
http://community.webshots.com/user/vw68autobug
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The PORTED VACUME to the Control Valve over rides the timed clutch release when the throttle is open. If you hook manifold vacume to it, the car will jump when you release the shifter while stopped. Be sure you have PORTED VACUME going to the control valve. That will be a port on the carb that gets its vacume from above the throttle butterfly. Vacume will only be present when the throttle is opened.
I pulled the small vacuum hose going to the control valve and when I took My hand off the gearlever, after puting it into gear....
it took a Loooong time to start moving....
when connected to the single pipe on My weber carburetor....
the clutch THUMPS into gear when the gearlever is let go.....
so, I need some vacuum but NOT too much...
I placed a screw in the small rubber hose and it worked perfectly for a few days and now thumps again....
I am going to se if I can take the vacuum pipe out of the solez original carby and put it into the hole in the weber carby....
or place a screw in the hose this time with a fine thread....
Lee Noonan 68AutoBug Australia
http://community.webshots.com/user/vw68autobug
You had manifold vacume going to the control valve, and thats why it jumped when you released the shifter.
You need ported vacume to the control valve. Ported vacume comes from above the throttle butterfly, and vacume will only be present when the throttle is open. My earlier message explains why we need ported vacume there. Also, under a plastic cap on the control valve, is an adjustment which determines engagement time while no vacume is present at the control valve. I have mine set for a 1 second engagement. The book suggests a longer time, but I like 1 second. Good luck finding ported vacume on that Weber, Im stickin with Solex. Jetted properly, the Solex is a great carb. Dennis, Red Bluff, California