[CornerStone]

So I'm trying to get this all welded up and I'm trying to figure out how to get in this tight of an area. I normally run the very large Pyrex cup with a lot of stick out but I think that the gas is being blown away. Am I going to need one of those super small long comes or should I rig up a secondary purge and diffuser ?

[TRACKRANGER]

With a bit of luck, Zanc will come to the rescue on this one. He's the master with this type of fabrication.

[AndersK]

should I rig up a secondary purge and diffuser ?

That has crossed my mind too and I intend to try it next time I get into a similar position.

If you try it please tell how it went.

[zank]

I would use aluminum foil and make a purge dam around the whole area. You could just wrap right around the collectors. Kick the pedal a few times and let the post flow flood the area. Give it a go. Don't be too tempted to crank the gas at the torch when you are actually welding though. If that doesn't work, you may want to have a purge line feeding the dammed in area. Let us know how it goes.

[CornerStone]

Damn, I honestly never thought about making a dam, I use foil to plug the pipe for back purging but I'll definitely give a dam a shot. Thanks dude.