Vaporizer outlet tube question

[jwrightjr]

I am in the process of refurbishing a vaporizer carb for my 27. I have most of it apart but struggling to get the outlet tube out so I can change it. I removed the screw that retains it but have not been able to get it to budge even after several heat cycles with a torch. I’m guessing there may be some kind of sealer or other voodoo glueing it in there. The question I have is what is the small hole directly above the retaining screw? My frustration has me wondering if there is a pin drove in there and may need to be drilled out? The new pipe only has 1 hole in the side assuming for the screw. I looked on all the diagrams but do not see a reference to it. I didn’t take a picture of it but can if needed. Any idea what it’s for?

[Henry K. Lee]

John can you post a picture.., should help us in the non mind reading department.

Hank

[jwrightjr]

Here it is. Stole this picture off the internet (too cold and too lazy to walk back out to the barn)

[Henry K. Lee]

I hear ya on the cold!!!!!!

Try soaking in some mineral spirits in a warm area for day or so. I do not remember a pin, but could be wrong. Might want to sand blast around that area for better detection work.

Hank

[jwrightjr]

Could be a vent but if it is this one is definitely plugged which could explain why it ran so poorly. Drawings do show some vents in that area but not at that location specifically. I am determined to make a good vaporizer. I have three of them I have been playing with and I know they can run well. A friend has one on his car and it runs perfectly but said he had to fiddle with it for some time to get it right.

[Mark Gregush]

From an older post; http://www.mtfca.com/discus/messages/41 ... 1403959330

[Chris Barker]

I looked at 3 Vaps I have and they all have the hole.
The hole is correct and it has a function. It vents into the curved annular groove around the outlet which connects into the primary air tube

[TRDxB2]

Is that hole "A" or "R" in the diagram? Click on it to make it larger

[jwrightjr]

I'm thinking that small hole is R. A-must vent through the end of the choke shaft? I stuck my bore-scope in there and if that is a vent it is plugged solid as well. I was able to get the outlet tube out today after letting it sit over night in the cold barn, didn't fight me too much (froze to death?) anyway I won that battle. Those vents were definitely plugged up. Even the channel around the tube was 90% full of carbon, rust and spider house. So if I'm thinking about this right and looking at the diagrams if that cannot vent adequately the carb would have a hard time supplying enough fuel on acceleration. If that is true then it would explain the very rich condition to make the car run, hesitating on acceleration, and the excessive carbon caused by the rich mixture. There could have been other problems caused by the carbon like the flapper sticking or a air leak but it sure seemed sealed up well. Am I thinking about this correctly?