Torch question
 

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since we are guessing, there is a Turbotorch setup with tanks that has a J28 copy. The tanks are a waste, but the torch is nice. The torch is the SKH-7a, and here is a (warning PDF) link to the outfits: link

If you're interested in branching out a little for long-term cost reduction, think oxy-propane: http://www.weldfabulous.com/p-20682-...ing-torch.aspx

everyone's had a propane tank, and oxygen tanks can be had pretty cheap.

the torch is a little large and thus heavy, but it will work. You probably will want at least one different size tip. The one good thing is that used tips should be easily available once you figure out which Harris/Victor torch they copied. That's the only problem with J28 clones, for some reason used tips are rare and the new ones are $50 each. The Smith AW1A tips are half that.

I use a similar setup because I have to carry it around our cars to where I braze and then carry it back. If you don't have to do any carrying you will be much happier with larger tanks. Also,check with your local welding shop and see what they can do for you before you pull the trigger on this one. You might be surprised.

I started out trying the little oxy/mapp setup. You're right, the tanks run out fast. The OA rig you get will be much nicer, regardless of tank size. You will be able to see how much you have in the tanks now so no surprises halfway through a preheat. The flame is better too. Not as small and intense. I think both run at about the same temperature but the OA flame is easier to work with.

I'm thinkin about change mine horixontal dropouts to verticals and I maybe using MAPP gas for it. Is it powerful of inaf for that operation? Heres specs about it: http://www.refrigerantchina.com/mapp-gas/270789.html

".... It produces a relatively hot flame (2,976°C)" and so on.

you will have a lot of trouble using MAPP to remove dropouts. It requires a lot of energy

I will cut off old dropouts. Would that gas be powerfull for that brazing operation? I'm using silver.

I have had trouble getting enough heat out of MAPP to do easier joining tasks than that. However, people report building bikes with MAPP. Apparently if you are really patient and heat for a long time, you can get frame parts up to silver brazing temperatures with MAPP. The problem would be keeping enough flux around for the brazing operation. You should use a 45% silver so that it will build.