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flynnr
02-19-2013, 10:29 AM
Hey guys I ordered up some parts to make a new wastegate dump tube (that redirects back into the down pipe of my exhaust).

I just got it in the mail today and I am unsure as to why there is a depressed ridge around the hole? There is one on each of the flanges and nothing on the opposite side.

Is this to help whoever welds it? The pipe has the same ID (38mm/1.5") as the ID of the hole in the flange, but the depressed portion is quite a bit bigger than the outside of the tube.

Thoughts?

http://i263.photobucket.com/albums/ii155/flynnr1/IMG_20130219_115349_zpsbaffc2c9.jpg

Corrado_Guy
02-19-2013, 10:58 AM
I would say it is easier to weld, the gasket surface would be the lower flange and the welded side would be the upper one. It can be really hard to get the pipe to sit right against the flange or like the one below the pipe slides inside the flange which means it can hit the pipe on the other side so it may not sit properly...

http://members.shaw.ca/syncrojetta1/Jetta_Syncro_391.jpg

The flange you posted above would have a really nice sealing surface when it was welded and it should be easy enough to fill the gaps as you are welding it up.

M-Hood
02-19-2013, 01:16 PM
I think it is designed that way so that a 1.5" or 1.75" tube can be used.

redline380
02-19-2013, 01:32 PM
im sure it for welding purposes