autolite 1100 choke heat tube

[Anonymous]

I have a 64 ranchero, 170cid, I had to replace the carb, so I bought one for a 65 model. It is an autolite 1100. My old one was manual choke, new one is auto choke. Smart guy that I am, I hooked up vacuum to the choke, found out it takes a heat tube. I have no idea how to fab something up , so can anyone give me some pointers ? Thank's in advance.

 

[Anonymous]

The heat tube is about a 1/4" tube that, in a stock application, bends down and takes in air from between the #3 and #4 exhaust sections of the exhaust manifold. There is a small vertical hole in the manifold where fresh air is sucked in from underneath the manifold, through the manifold, where it is warmed, and into the tube which leads to the choke. Also, the tubing is usually insulated.

If you have a stock application all you need to do is get a maybe foot long piece of tubing, a tube bender if you have one, and a ferrule and female end for the tube. Once you figure out what to do it will take you about 5 minutes to do it.

Sorry I don't have a picture.

-Dan in Atlanta

 

[Anonymous]

Thanks Dan

 

[ludwig]

You can order the stock choke tube from NPD.
You can also get an aftermarket heat collector at a speed shop. It looks like a little quonset hut with a hole for the tube in one end. You clamp the curved collector part onto the manifold with a hose clamp. Then you run the tubeing freehand up to the intake at the choke. Works just as well as stock. Sometimes the heat plenum between 3 and 4 is burned out and you get hot exhaust gas pumped into the choke pulloff. This will melt the plastic cap.
You could also just get about 2 feet of 1/4" tubing and coil it around a part of the manifold or the exhaust pipe and run the other end up to the carb.
All this sounds far more complex than it is.

 

[Anonymous]

Thanks Ludwig, You are right about the hole being plugged, I'll go with the copper tubing wrapped around the manifold.

Thanks Guys

 

[I66coupe]

Just use some brake line. You can (carefully) bend it by hand, fits right in.