Choke tube

[Anonymous]

When I purchased my car there was no tube going from the exhaust manifold to the carb, I bought on of those universal ones from the HELP section at Auto Zone, is this thing supposed to take hot exhaust directly from the manifold and put it into the choke housing? I'm thinking of plugging the hole and going with an electric choke kit.

 

[BIGREDRASA]

It takes heated air, not exhaust.

 

[Anonymous]

No there is a 3/16 hole in the top of the manifold and the tube fits down into it and runs around to the drivers side of the carb (Carter YF ) and into the choke housing. It's definately exhaust comming out of the hole.

 

[BIGREDRASA]

I'm pretty sure you'll find that the hole doesn't actually go into the manifold/exhaust flow. Can you feel exhaust coming out?

 

[Anonymous]

Yes and smell it, when you take the tube out it sounds like an exhaust leak, the hole is located in the middle of the siamese exhaust ports on top of the manifold.

 

[ludwig]

The divider between your exhuast ports is spalled and perforated, allowing exhaust to get into what should be no more than a hot air riser.
Tap the hole top and bottom, then plug it with a screw on both ends so the exhaust goes out the pipe. Then get a clamp-on hot air riser from a speed shop. It is a little tin hat that clamps to the manifold. Other folks here have used a soft copper tube wound around the manifold a couple times and screwed into the choke tube port on the choke with a compression fitting.
You want hot air not hot exhuast in your choke pull off.

 

[Anonymous]

i have been using carter YFA carbs (have 5 in total, only 2 are funtional...rest are parts and experimenting) i have 2 carbs that have the exhaust thing u are talking about, it does use exhaust and there is a little piston inside the choke and attached to the butterfly valve shaft thing (haha...sorry for technical terms) but i get what your talking about...its not a big deal because the choke was also electrically controlled, not sure if thats stock but thats the way it is. i also have electiricly controlled carbs that have a spot that looks like it takes the exhaust tube, but its closed and not threaded or anything...so i took the carb that used the exhaust tube and blocked it off...doesnt operate any differently, actually its probably better, because i had a problem before with the choke getting stuck because of carbon build up on the piston...so yea...just block it off on the carb and dont worry about the little hole, unless u have a way to block that too...pretty small hole...doesnt bother me since i already have an exhaust leak.

 

[ludwig]

The problem with exhaust heat is that it blocks the spring, as you noted, and can also melt the cap that covers the bimetal spring. If you have a pressure operated flap, then we are not discussing the same thing.
Living here in LA, the choke only does me good for about 45 seconds and I can finesse that with the gas pedal.