| [ Total Views: 523 | Total Replies: 8 | Thread Id: 16924 ] |
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| posted on December 22nd, 2003 at 01:07 PM |
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twin carbs, only 1 cut off valve?
The other day I was disengaging the automatic choke on my 77 bus. It has twin carbs (stock solex). The right carbie has a 'bypass mixture cut off
valve' but the left does not. It doesnt seem to have a screw either. The valve is an electromagnetic valve and has a wire from the coil
connecting to it. Does anyone else fly solo.
NB If the valve is not connected to the coil the engine runs like a dog and blows flames out of the exhaust along with backfiring when slowing the
car through the gears.
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 Bizarre
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| posted on December 22nd, 2003 at 01:18 PM |
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If it is the valve i am thinking of it is the one on the lh carb towards the front of the carb. It connects to the air system. I had trouble with mine
being loose and was sucking air around it causing the motor to idle low and run on
It is involved with the central idling system and needs to function
Futue te ipsum!!!
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Purple Martin
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| posted on December 23rd, 2003 at 10:59 AM |
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Mine only has one cut-off valve (I can't remember which side) and it is enough to prevent running on.
1959 red & white Beetle
1975 Kombi camper
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tassupervee
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| posted on December 23rd, 2003 at 11:43 AM |
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Those anti-run on valves block fuel in the slow run (idle) circuit of the carb so if they're not powered off ignition then yeah, you get those
flames and fun and games on throttle overrun!
Some cars use an external air bleed valve that opens when the ignition is switched off and let fresh air into the manifold under the carbies so the
carbies wont draw fuel when switching off to prevent run on.
Curious there is only one tho?? Must be enough.
L8tr
E
Im not a complete idiot, quite a few parts are missing....
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| posted on December 23rd, 2003 at 06:24 PM |
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when i re-attach the wire from the coil to the cut off valve, things are good again. It is odd that there is only 1 especially as there is a wire
going in that direction with nowhere to connect to! Mmmmm
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kombikim
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| posted on December 23rd, 2003 at 10:35 PM |
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the pasenger side carbie has a central idling system cuttoff solenoid near the top in the cover, & both carbies should have another cutoff
solenoid high in the body to the outside of edge of engine, it was common when these die for the to be replaced by a normal idle jet which screws
straight in, you should be able to feel it, it is located exactly where the other one is, it wont do any harm to have it.
Please, I need drivers side window regulator (winder mechanism) for my '54  |
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| posted on January 11th, 2004 at 04:00 PM |
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Everything came good in the end
The electronic cut off valve is required but you only need 1 and...
I reakon my bus runs better with the auto choke disengaged.
Thanks
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Astro Boy
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| posted on January 12th, 2004 at 10:17 AM |
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what do you mean disengaged? did you just pull the wires off or did you take the choke off and wire the flap open?
Save water, drive an air cooled Volkswagen.
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bigbruvabob
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| posted on January 12th, 2004 at 12:21 PM |
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auto choke disengage
Okay i will assume this is the same on all solex carbs as i have done this on both my 34 and 28 pict beetles. John muir describes auto chokes as a
conspiracy by car makers to get your engine to run richer decrease engine life and ensure you by more parts/engines from them. he describes how to
disengage in his books something like this.
To the right hand side of the carby you will see a round device about the size of a twenty cent piece that is clamped by three screws. this has a wire
running from it to your coil and will be stamped solex 12v.
1) remove wire and tape off and secure in place out of way. you can cut and permanently remove but then it is harder to reconnect in future if you
need to.
2)loosen the three screews on the choke mechanism enough so that you can rotate the circle , do not take all the way off just loosen so that it
easily moves , rotate it in one direction and it will open the butterfly valve in the carb, turn it the other way and it will close the butterfly
valve in the carb. To disarm you want to turn it so that it opens all the way and then keep turning in that direction as far as you can and then
tighten the three screws and the auto choke is disarmed. this means that at start there is no choke at all on and you may get a harder start just pump
your foot a couple of times before ignition to get fuel in and then let your motor warm up properly. on the left side of the carby is the fast idle
cam this is the toothed swinging lever that allows a fast idle you need to tie this back so that it does not affect your idle i just tied miine back
with a rubber band
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Astro Boy
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| posted on January 12th, 2004 at 02:17 PM |
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should i disengage my auto choke. what do people think?
Save water, drive an air cooled Volkswagen.
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| posted on January 14th, 2004 at 04:07 PM |
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I did it exactly the way described above.
I am trusing the logic of this manouvre.
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