Exhaust flanges work by using a gasket and a set of bolts to join them together. When setting up a exhaust or waste gate pipe for ease of fitment it is recommended that you use exhaust flanges or v bands to enable sections to be pulled off and re-fitted for access.
You can use exhaust flanges without gaskets, you will need to use a automotive grade silicon
The gasket in the picture have a copper ring pressed on the inside to help prevent the gasket from blowing out from the heat of the exhaust.
- The bolts to join the flanges together are easily replaceable if threads strip from over tightening
- These are more forgiving with distortion when welding (will still bolt up and seal if slightly distorted)
- The gaskets can be effected by heat and blow out over time, these can also blow out if your flange is heavily distorted
V band Flange
- V bands do not require gaskets so there is one less thing to fail
- When your exhaust and waste gate setup are all made up of v bands then there is no set alignment, this can cause issues when bolting things together if they are not sitting in the correct orientation
- The v band clamp thread can strip easily because of the small thread size, when over tightened or bolting/unbolting when hot these can bind and seize. Another main reason for the thread and nut to seize is if they are both stainless steel