Long story short: my exhaust pipe snapped into 2 pieces right next to a flange connecting it to an upstream piece. Since it's too close to the flange, I cut the flange off and inserted a piece of pipe there instead, bridging the 2 pieces of pipe. I used high temp epoxy as an adhesive and then high temp silicone to seal it off. The heat of the exhaust burned through both and the pipe fell off.
Problem: the smallest exhaust band clamp I can find is for 2" OD pipe. My pipe is 2" OD at one end (the downstream side), but 1 3/4" OD at the other end (the upstream side). This is because the 2 pieces of pipe that I am joining (what used to be 2 pipes joined by that flange I cut off) are 2 different diameters. I've been to other auto parts stores, none have a smaller band clamp. I've tightened the 2" band clamp as far as it goes, it's still completely loose.
Question: how do I add about 1/4" thickness to the outside of my pipe so that the band clamp fits? It needs to be:
- something hard (so silicone is out)
- must resist exhaust heat
- must be either rollable by hand to cover the exhaust pipe or already tube shape
Is thin sheet metal able to resist exhaust temperatures? What kind of sheet metal? Aluminium? Stainless steel?