How does my Choke work?
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From: At the end of 2 big long black marks on #2 Sideroad and Walkers Line.
How does my Choke work?
I am rebuilding my choke, and I cant figgrue out how it works.
I have some pictures Here
I have the original vacume choke. If anybody has pictures that would be great, or if anybody can describe how it works that would be great as well.
Thanks for your help in advance
chris.
[Modified by PyjamaSam, 7:35 AM 7/13/2002]
I have some pictures Here
I have the original vacume choke. If anybody has pictures that would be great, or if anybody can describe how it works that would be great as well.
Thanks for your help in advance
chris.
[Modified by PyjamaSam, 7:35 AM 7/13/2002]
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From: At the end of 2 big long black marks on #2 Sideroad and Walkers Line.
Re: How does my Choke work? (paul79)
Basically kinda like the ones I took, if you can. Anything that shows the back of the choke, so I can make sure the levers are on the right way.
Thanks in advance.
chris.
Thanks in advance.
chris.
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From: At my Bar drinking and wrenching in Lafayette Colorado
Re: How does my Choke work? (PyjamaSam)
Chris -
Your choke is not a vacuum choke - it's a hot air choke pulling hot air from the manifold heat crossover, heating a bimetallic spring, and this expands to relax its tension on the choke as the engine heats up. You have one steel tube running from the back of the carb (in the air filter inerface area) to the manifold. Then, a tube runs from the maifold to the front of the choke housing. Inside the choke housing, there is a vacuum bleed hole that connects to manifold vacuum on the carb float bowl with a small nylon interface fitting. Vacuum at this fitting pulls air from the back of the carb at the air filter, the air is pulled through the heat exchanger in the manifold, gets hot, and is drawn into the choke housing. This heats the spring, it expands, and the spring pulls the choke open.
I have lots of carbs laying around that I can shoot for you if you need the photos still. I can also shoot the correct sequence and the steps needed to "fish" the intermediate choke lever shaft into position if you need it. Just lemme' know...
Your choke is not a vacuum choke - it's a hot air choke pulling hot air from the manifold heat crossover, heating a bimetallic spring, and this expands to relax its tension on the choke as the engine heats up. You have one steel tube running from the back of the carb (in the air filter inerface area) to the manifold. Then, a tube runs from the maifold to the front of the choke housing. Inside the choke housing, there is a vacuum bleed hole that connects to manifold vacuum on the carb float bowl with a small nylon interface fitting. Vacuum at this fitting pulls air from the back of the carb at the air filter, the air is pulled through the heat exchanger in the manifold, gets hot, and is drawn into the choke housing. This heats the spring, it expands, and the spring pulls the choke open.
I have lots of carbs laying around that I can shoot for you if you need the photos still. I can also shoot the correct sequence and the steps needed to "fish" the intermediate choke lever shaft into position if you need it. Just lemme' know...
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Re: How does my Choke work? (PyjamaSam)
Well, I don't know how yours works, but whenever I spend too much money on the vette, my wife usually uses both hands!!
Chris, I have a brand new (6 months old) choke that you can have, I bought it and had it on the car for 6 months before the resto began. I don't know if it is the same as your car has. I should look at your pics.
Chris, I have a brand new (6 months old) choke that you can have, I bought it and had it on the car for 6 months before the resto began. I don't know if it is the same as your car has. I should look at your pics.
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From: At the end of 2 big long black marks on #2 Sideroad and Walkers Line.
Re: How does my Choke work? (lars)
Thanks Lars. That is a nice description.
The Sequence for the intermediate choke lever would be great (This all started by me trying to remove the choke and popping off that lever :-))
I am basically looking for pics or information on how to hook up all the little levers on the choke (i.e where they go, what they connect to)
thanks for your help
chris.
The Sequence for the intermediate choke lever would be great (This all started by me trying to remove the choke and popping off that lever :-))
I am basically looking for pics or information on how to hook up all the little levers on the choke (i.e where they go, what they connect to)
thanks for your help
chris.
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Re: How does my Choke work? (PyjamaSam)
Better late than never! Here is the hot-air choke.
Here are a couple of the external pieces. The tube on the right is the heat tube that fits into the cross-over passage in the manifold. That passage, and the tube, is heated on cold start from exhaust gases deflected through that area of the manifold by a closed heat riser control valve on the passenger side exhaust manifold. The open/closed condition of the heat riser is controlled by a thermal vacuum switch (TVS) located on the thermostat housing. So yes, there is a vacuum dimension at play here. Default on cold start-up is vacuum on. When the TVS senses an appropriate temperature (120F) at the thermostat, it opens and closes off vacuum to the heat riser actuator which then opens the heat riser valve to allow a free flow of exhaust. And you have a warmed up engine! The other two tubes in the pic connect to the heat tube on the manifold as shown above. One goes to the back of the Q-jet (why?) and one into the choke coil housing, by a small rubber connector. I will let others pick up from there. I know how to connect the system - and mine works - but I do get lost in the interactions of the various components.
[Modified by paul79, 5:12 PM 7/14/2002]
[Modified by paul79, 5:16 PM 7/14/2002]
Here are a couple of the external pieces. The tube on the right is the heat tube that fits into the cross-over passage in the manifold. That passage, and the tube, is heated on cold start from exhaust gases deflected through that area of the manifold by a closed heat riser control valve on the passenger side exhaust manifold. The open/closed condition of the heat riser is controlled by a thermal vacuum switch (TVS) located on the thermostat housing. So yes, there is a vacuum dimension at play here. Default on cold start-up is vacuum on. When the TVS senses an appropriate temperature (120F) at the thermostat, it opens and closes off vacuum to the heat riser actuator which then opens the heat riser valve to allow a free flow of exhaust. And you have a warmed up engine! The other two tubes in the pic connect to the heat tube on the manifold as shown above. One goes to the back of the Q-jet (why?) and one into the choke coil housing, by a small rubber connector. I will let others pick up from there. I know how to connect the system - and mine works - but I do get lost in the interactions of the various components.
[Modified by paul79, 5:12 PM 7/14/2002]
[Modified by paul79, 5:16 PM 7/14/2002]
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From: At the end of 2 big long black marks on #2 Sideroad and Walkers Line.
Re: How does my Choke work? (paul79)
Paul that is great. Thanks. Is is possible to get a picture of the back of the choke.
I want to make sure the little levers are on the right way around.
Thanks for you help so far.
chris.
I want to make sure the little levers are on the right way around.
Thanks for you help so far.
chris.
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Re: How does my Choke work? (PyjamaSam)
I am not sure what you mean by the "back" of the choke. But here are two additional pics. Hope they help!
*Edit*-I am a little embarrassed. My choke is not quite adjusted properly although it works very well in the temperature I drive in. That butterfly flap should be completely shut and the air cleaner base to carb should have a large round gasket on it:bb . I have one in the basement inventory. Thanks for asking questions;) .
[Modified by paul79, 4:54 PM 7/15/2002]
[Modified by paul79, 5:35 PM 7/15/2002]
*Edit*-I am a little embarrassed. My choke is not quite adjusted properly although it works very well in the temperature I drive in. That butterfly flap should be completely shut and the air cleaner base to carb should have a large round gasket on it:bb . I have one in the basement inventory. Thanks for asking questions;) .
[Modified by paul79, 4:54 PM 7/15/2002]
[Modified by paul79, 5:35 PM 7/15/2002]
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From: At the end of 2 big long black marks on #2 Sideroad and Walkers Line.
Re: How does my Choke work? (paul79)
Thanks paul. These pictures are great...
It looks like I have caught the "While I am There" bug, SO I am rebuilding and rejetting my carb using Lars paper...
And to think 6 months ago I had never done anything on a car. No I am rebuilding a carb.. Hmm can we say I am in over my head. :-)
Oh well. So far so good.
Ya I got one of those seals in my rebuild kit (Which for reference cost me about $25 CDN from Canadian Tire)
chris.
It looks like I have caught the "While I am There" bug, SO I am rebuilding and rejetting my carb using Lars paper...
And to think 6 months ago I had never done anything on a car. No I am rebuilding a carb.. Hmm can we say I am in over my head. :-)
Oh well. So far so good.
Ya I got one of those seals in my rebuild kit (Which for reference cost me about $25 CDN from Canadian Tire)
chris.
