Originally Posted by Ludwig II
Has anybody made a tank or know of a tank made using the 2 stroke expansion chamber technique of blowing? You weld 2 flat pieces of steel together along the edges and then pump water in until they balloon outwards. You can get some very swoopy shapes that way.
I've never heard of expansion chambers being formed in that way. You want the dimensions of a pipe to be very precise, something not possible by pumping water in between a couple of welded plates.
Most OEM chambers are made two halves of stamped sheet metal that's been welded together like this -
And most aftermarket pipes are constructed from rolled cones and bent header pipes, again welded together -
Whoever told you that water forming fairy tale was just making things up to see if you'd believe them.